X.-L. Yang’s research while affiliated with Central South University and other places

What is this page?


This page lists works of an author who doesn't have a ResearchGate profile or hasn't added the works to their profile yet. It is automatically generated from public (personal) data to further our legitimate goal of comprehensive and accurate scientific recordkeeping. If you are this author and want this page removed, please let us know.

Publications (21)


Mechanics performance research and microstructure analysis of nanomaterials modified asphalt
  • Article

October 2011

·

12 Reads

·

9 Citations

Jianzhu Cailiao Xuebao/Journal of Building Materials

·

L. Li

·

X.-L. Yang

·

[...]

·

S.-P. Luo

In order to improve properties of asphalts and asphalt mixtures, the selection and addition of nanometer materials, which were to modify the base asphalt was done, and the preparation of nanomaterials modified asphalt was conducted. A series of asphalt experiments were performed to analyze the basic performance, such as penetration, ductility, softening point, viscosity with atomic force microscope (AFM) and etc. Then, tests of asphalt mixtures were carried out to evaluate properties of nanomaterials modified asphalt mixtures, such as splitting strength, resilient modulus, rutting, water stability and etc. Besides, modified effects of nanomaterials (nanocarbon powders, nano powdered rubbers VP362 and sepiolite) were analyzed and compared. The test results show that the high temperature and low temperature crack resistance of asphalt and asphalt mixtures modified by 2% nanocarbon powders is better than these of asphalt and asphalt mixtures modified by VP362 or sepiolite, also it is confirmed scientifically by atomic force microscope(AFM) experiments from microcosmic viewpoint.


Calculation and analysis of infiltration rate of asphalt pavement based on percolation theory

April 2010

·

351 Reads

·

5 Citations

For the pavement containing cracks, which is set porous base course between surface course, the tube theory and fracture seepage theory for simulating the water infiltration in pavement were adopted. The mathematical model for calculating infiltration rate of pavement containing cracks was established and the theoretical calculation formula of infiltration rate was deduced. Then, the model was calculated and analyzed. The results show that the infiltration rate presented by the standard is lower and can not be applied to accurately estimate the infiltration capacity of pavement in a later damage, while the infiltration rate should be determined according to the damage degree of pavement, such as crack length, crack width and crack density. If the flux of infiltration capacity of surface course is constant, the higher the permeability coefficient of porous materials, the thinner the thickness of porous base course, while the lower the permeability coefficient of porous materials, the thicker the thickness of porous base course.


Calculating method of upper bound for ultimate pullout capacity of vertically loaded strip plate anchors based on nonlinear Mohr-Coulomb failure criterion

October 2009

·

15 Reads

·

9 Citations

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

Based on the upper bound limit analysis theorem, the associated flow rule and the nonlinear M-C failure criterion, the ultimate pull-out capacity (UPC) of vertically loaded strip plate anchors were studied by means of the kinematical approach of limit analysis theory. The procedures were as follows: the nonlinear shear strength parameters, i.e., internal friction angle ψt and cohesive force ct, were treated as variable parameters for the calculation schemes. The objective function of UPC was obtained by equating the work rate of external force to internal dissipation along the velocity discontinuities, and the upper bound solutions were presented by applying a nonlinear sequential quadratic programming (SQP) algorithm. The results show that the nonlinear failure parameter exerts a significant effect on UPC, and if the nonlinear M-C yield criterion turns into a linear M-C yield criterion, the results presented here agree well with the real ones. The density of soil mass, the embedment ratio, the interface properties, the inclined angle and the geometric properties have significant effects on UPC and the region of failure modes.


Study on the Ultimate Pullout Capacity and Shape Modification Factors of Horizontal Plate Anchors Based on Nonlinear Mohr-Coulomb Failure Criterion

July 2009

·

21 Reads

·

5 Citations

Based on the limit analysis and nonlinear Mohr-Coulomb failure criterion, the ultimate pull-out capacity of horizontal plate anchors is calculated, in which the type of anchors and the corresponding failure mechanism are taken into consideration. The ultimate pullout capacity is obtained by a nonlinear sequential quadratic programming algorithm, and the theoretical results are compared with the available results presented in the existing literatures. The relationship between the nonlinear parameter and the ultimate pullout capacity is analyzed. The shape modification factors for different kind of anchors are given through a multiple nonlinear regression method.


The Upper Bound Calculation of Passive Earth Pressure Based on Shear Strength Theory of Unsaturated Soil

July 2009

·

30 Reads

·

12 Citations

Based on the shear strength of unsaturated soil, the passive earth pressure of unsaturated soils is studied by means of the kinematical approach of limit analysis theory, in which not only the saturated shear strength parameters φ', c' and (ua-uw), but also the soil-water characteristic curve and the engineering practice are analyzed synthetically. The result of upper bound method for passive earth pressure is obtained via the sequential quadratic programming. The numerical results show that the existing of soil suction and the distribution mode of soil suction exert a significant effect on the passive earth pressure. Meanwhile, if the yield criterion of unsaturated soils turns into the yield criterion of saturated soils, then the solutions presented here ameliorate appreciably with available predictions.


Failure Mechanisms and Corresponding Stability Charts of Homogenous Rock Slopes

July 2009

·

10 Reads

Geotechnical Special Publication

Failure mechanisms of homogenous rock slopes were investigated within the upper bound theorem of limit analysis. In rich water zone, the effective stress analysis of saturated slopes is considered. The corresponding charts for different types of rocks are presented for practical use. From the results, it is found that the stability factors increase with the increasing rock strength, and that the nonlinear parameter and rock types have important effects on failure mechanisms. According to the results, new equations for determining the stability factors are proposed.


Mechanism analysis of fracture grouting in soil with large strain considering intermediate principal stress

September 2008

·

16 Reads

·

11 Citations

Yantu Lixue/Rock and Soil Mechanics

On the bases of the plastic mechanical mechanism and the large strain, the early phase of fracture grouting is regarded as the question of cavity expansion in infinite soil. The stress distribution due to the cavity expansion in soil is considered as two zones. The deformation following little deformation in elastic zone and large-deformation in plastic zone is taken into consideration. The initial fracturing grouting pressure is the limited expansion pressure and the second fracture grouting take place when the large and small stress of soil is conversion. On the bases of the stress equilibrium equation and continuous boundary condition of stress and deformation, the stress distribution in the elastic-plastic zones, the terminal plastic zone radius and fracturing grouting pressure are obtained. According to the compassion, the result of the present theory is very near to that of the engineering practice.


Study on performance of reinforced embankment on mountain slope with full-scale model test

August 2008

·

7 Reads

·

2 Citations

Yantu Lixue/Rock and Soil Mechanics

The performance of a reinforced and an unreinforced embankments on mountain slope foundation are studied with full-scale models. The models are surcharged until collapse under load on the embankments crest. This paper focuses on the test design and instrumentation of the embankments on mountain slope. During the experiments, the vertical forces distribution, displacements of slope, the form and position of the slip curve surface in the two embankments are also investigated. The test results show that the geogrid will improve the stability and the ultimate bearing capacity; and the lateral displacements of the reinforced embankment are smaller than that of the unreinforecd embankment. The test resalts are very useful for the expressway design and construction in the mountain region.


Study on grouting pressure of fracture grouting in saturated soil

July 2008

·

43 Reads

·

15 Citations

Yantu Lixue/Rock and Soil Mechanics

Bases on theory of plasticity and the large strain, the early phase of fracture grouting is regarded as the question of cavity expansion in infinite soil. The stress distribution due to the cavity expansion in soil is considered as two zones. The deformation following little deformation in elastic zone and large-deformation in plastic zone is taken into consideration. By using the theory of cavity expansion, hydro-fracture and pore water pressure theory, on the assumption that the sum of initialization stress of soil and increment due to cavity expansion is equal to the pull strength of soil, the soil is fractured by grouting. If the large and small stress of soil is conversion, the second fracture grouting takes place. Based on the above theory, the fracture grouting pressure in saturated soil is given. According to the comparison, the result of the present theory is very near to the those of the engineering practice.


Dynamic compaction theory and experiments in high roadbed filled with red sandstone

February 2008

·

20 Reads

·

11 Citations

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

Based on the assumption that the upheaval around the tamper hole and the radial deformation was smaller, the tamper hole bulk equaled the reduction of small opening ratio after tamping, and the soil mass tamped was not changeable, the relationship between energy of tamper and settlement, compaction degree, small opening ratio was obtained. The formulation of the compaction degree and small opening ratio along the depth were given. The parameters of tamper construction design were confirmed. The reliability and validity of the tamper construction design was proved by a series of trail in local. The results show that compression modulus increases by 15%, and the tamping settlement decreases gradually with the increase of tamp times.


Citations (18)


... The structural internal forces of seismic response of shallow-buried large-span double-arch 633 tunnels and compared them with single-arch tunnels were solved by Yang et al. [4]. Huang [5] found that seismic response of a shallow-buried double-hole tunnel under anti-seismic measures. ...

Reference:

Research on seismic response of new lining structured of shallow double-arch tunnels under unsymmetrical pressure
Earthquake response of large span and double-arch shallow tunnel
  • Citing Article
  • October 2006

... Yao et al. [12] derived the rock bolt interface shear stress produced by the deformation of the surrounding rock, taking the displacement of rock as the functional parameter, thereby allowing the location of the neutral point and axial force distribution of a fully grouted rock bolt to be determined. Based on the damage characteristics of rock and soil under the action of shear stress and the load transfer mechanism of rock bolts in rock and soil mass, Zou et al. and others [13][14][15] established a differential equation for the load transfer of a rock bolt when the rock and soil mass was damaged, and derived an analytical solution of the distribution of axial force, shear displacement, and side friction along the length of a rock bolt. ...

Study on load transfer mechanism for span-type anchor based on the damage theory
  • Citing Article
  • December 2007

... Hansson, Lundin, and Simunek (2005) applied the cubic law to estimate water infiltration through cracks, but this research did not take into consideration pavement damage degree and crack disputation. Dan, Li, Yang, andZhao (2010, 2011) presented an approach based on Ji's method to estimate the PIR by taking crack distribution and geometrical characteristics of crack; however, the hydraulic gradient in the drainage layer needs to be investigated further. McEnroe (1994) pointed out the water retention in the unsaturated drainage layer affects the inflow and drainage efficiency. ...

Calculation and analysis of infiltration rate of asphalt pavement based on percolation theory
  • Citing Article
  • April 2010

... Split grouting, as the main technical means to manage geological disasters such as sudden water surges and mud surges in complex and weak strata and stratum subsidence, is widely used in hydraulic [1], land transportation [2], construction [3], Y. Hu Shandong Provincial Communications Planning and Design Institute Group Co, Ltd., Shandong, China energy [4] and mining [5] and other basic engineering and construction industries. Comprehensive domestic and foreign scholars existing research conclusions, slurry injected into the weak geotechnical body at a certain pressure, pore water pressure exceeds the initial stress and the incremental sum of the expansion stress, tensile stresses in the injected geotechnical medium, when the tensile stress exceeds the tensile strength of the injected geotechnical medium slurry will be along the perpendicular direction of the main stress with the small in the weakest position will be the formation of slurry vein channels [6,7], the grouting pressure at this time is the splitting pressure of split grouting [8,9]. Splitting slurry along the splitting path in the injected geotechnical body to form a slurry vein skeleton, and the slurry vein on both sides of the soil body to produce extrusion, so as to enhance the overall structural strength of the injected geotechnical body [10][11][12]. ...

Study on grouting pressure of fracture grouting in saturated soil
  • Citing Article
  • July 2008

Yantu Lixue/Rock and Soil Mechanics

... Spring soil phenomenon and inhomogeneous compaction have effects on the quality of embankment construction just because the water in soil is difficult to evaporate. When subjected to moving traffic loads, the dynamic response and deformation performances of the high liquid limit soil subgrade have large differences with a traditional subgrade compacted by sandy soils or gravels or artificial filling materials [1][2][3][4][5]. is is due to the fact that the high liquid limit soil has distinctive features of high compressibility, disintegrating, softening by absorbing water, shrinking and cracking by losing water, and repeated changing. ...

Dynamic compaction theory and experiments in high roadbed filled with red sandstone
  • Citing Article
  • February 2008

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

... (1) Atomic force microscopy (AFM) test An atomic force microscope (AFM) test can analyze the micro-surface morphology, viscosity, and molecular interaction of polymer-modified asphalt [25][26][27][28][29][30][31][32][33][34][35]. In this study, a FastScan atomic force microscope was used (from BRUKER Corporation in the United States). ...

Mechanics performance research and microstructure analysis of nanomaterials modified asphalt
  • Citing Article
  • October 2011

Jianzhu Cailiao Xuebao/Journal of Building Materials

... The failure surface shape and the failure mechanism in different rock and soil mass have been studied by many researchers and most of assumptions for rupture surface shape of shallow anchor subjected to limit load were presented. Published data and test results have been summarized and studied by Zou et al. [24]. A new rapture surface shape for shallow anchor subjected to a vertical force is developed considering the following boundary condition: at the surface failure outlet, the angle between the failure surface and the ground surface is /4− /2; and a parameter equation of failure surface shape for shallow anchor has been proposed as shown in Figure 1. ...

Study on the ultimate pullout force of pre-stressed cable based on nonlinear Mohr-Coulomb failure criterion
  • Citing Article
  • January 2007

Chinese Journal of Geotechnical Engineering

... Simple solution methods solving the SIFs of elastic-plastic soils under fracture grouting has attracted the attention from many researchers. In 2008, Zou et al. 12 assumed that the fracture grouting pressure can be determined through the nonlinear Hoek-Brown strength criterion in fracture mechanics and an empirical technique was proposed to determine the SIFs. In 2010, Han et al. 13 presented a convenient method to estimate grouting pressure during fracture grouting, and claimed www.nature.com/scientificreports/ that the boundary of fracture grouting and elastic-plastic soils can be expressed as an ellipse, approximately. ...

Mechanism analysis of fracture grouting in soil with large strain considering intermediate principal stress
  • Citing Article
  • September 2008

Yantu Lixue/Rock and Soil Mechanics

... For Equation (12), we separate the variables and consider the boundary conditions: The value of (p k ). was obtained by referring to the literature [43]. The mechanical mechanism of fracture grouting inevitably requires a thorough analysis of the aggregation and compaction process in the first stage. ...

Mechanism analysis of fracture grouting in soil
  • Citing Article
  • April 2006

... Also, many grouting theories have been created, including the seepage grouting theory [178], the fracture grouting theory [179], and the compaction theory [180]. These theories reveal the variation law of grouting pressure, grout flow rate, diffusion radius, and grouting time in the grouting process and serve as guides for design and construction. ...

Method of energy analysis for compaction grouting
  • Citing Article
  • March 2006

Yantu Lixue/Rock and Soil Mechanics