Panpan Guo

Panpan Guo
Hefei University of Technology · School of Civil Engineering

Doctor of Philosophy

About

41
Publications
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671
Citations
Introduction
Panpan Guo is now a Lecturer at School of Civil Engineering, Hefei University of Technology. His research interests include (1) soil and rock mechanics; (2) deep excavations; and (3) tunnelling and underground space technology. His email address is guopanpan@hfut.edu.cn.

Publications

Publications (41)
Article
Full-text available
The cofferdam method is generally applied in the construction of underwater pier foundation in bridge engineering, and the pouring of bottom sealing concrete is one of the important links in the construction of the cofferdam. The bottom sealing concrete can prevent water seepage and balance the main body of the cofferdam, and its structural size an...
Article
Full-text available
Reviewing literature revealed that the studies on the bearing characteristics of pile foundations mainly focuses on clay, ordinary sand, loess, saline soil, and other areas. However, few studies on the bearing characteristics of the pile foundation in calcareous sand were conducted. Besides, existing traditional studies ignored the variation of soi...
Research Proposal
Full-text available
CALL FOR PAPERS: Special Issue "Risk Management Technologies for Deep Excavations in Water-Rich Area" A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "New Sensors, New Technologies and Machine Learning in Water Sciences". Website: https://www.mdpi.com/journal/water/special_issues/V8W2XJ3ZP4
Article
This paper proposes a novel form of gravity foundation for long-span suspension bridges. The foundation combines a caisson with bored piles, and thereafter is termed caisson-bored pile composite anchorage (CBPCA) foundation. Based on a typical suspension bridge case study with traditional caisson foundation, the feasibility of the proposed foundati...
Article
Full-text available
This paper analyses the deformation and force behavior of a wood-piled island cofferdam based on the principle of equivalent bending stiffness. The horizontal deformation and bending moments in wood piles and the axial stress in tension bars on top of piles were both analyzed by the finite difference (FD) method. Except for the analysis of the coff...
Article
Full-text available
In geological engineering, the existence of fault fracture zones has an obvious impact on the stability and failure process of the surrounding rock of mountain tunnels. In this study, a series of models with double pre-existing filled flaws and a circular hole were established and simulated under uniaxial compression. The results indicate that the...
Article
Full-text available
A linear parallel bond model combined with Weibull distribution to take into account the mechanical heterogeneity of brittle rocks is used to investigate the cracking behavior, acoustic emission (AE) characteristics and full-field stress evolution of rocks containing three parallel pre-existing flaws under uniaxial compression. The intact model is...
Article
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This paper describes recent advances in the effect of soil creep on the time-dependent deformation of deep braced excavation. The effect of soil creep is generally investigated using the observational method and the plain-strain numerical simulation method. The observational method is more applicable for deep braced excavations in soft clays constr...
Article
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The existence of flaws in brittle rocks or rock-like materials has an obvious influence on the material mechanical properties and cracking behavior of civil engineering projects. In this work, the two-dimensional particle flow code PFC2D was used to study the deformation and strength properties, failure processes, and acoustic emission (AE) charact...
Article
The cracking behavior and mechanical properties of brittle rocks is controlled by its microstructure. In this work, an extended grain-based phase field method (GB-PFM) based on Voronoi tessellation technology is proposed to investigate the mechanical properties and crack propagation in heterogeneous brittle rocks by considering material heterogenei...
Article
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Leakage-induced hydraulic and ground responses in a twin-tunnel system are analyzed via the proposed analytical solution on the seepage field. The seepage continuity conditions are rigorously satisfied at the interface between the ground and the tunnel lining, in terms of both water pressure and seepage velocity. The analytical solution is verified...
Article
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Based on the background of the foundation pit project supported by the anchored diaphragm wall,the anchorage performance,force transfer mechanism,design calculation and optimization method of the prestressed anchor cable are studied under the condition that the anchorage section of the prestressed anchor cable passes through the water-richsand and...
Article
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This paper proposes simplified analytical solutions for longitudinal tunnel settlements induced by axially loading single pile and pile group. The solutions are based on the extended shear displacement method and the two-parameter beam on elastic foundation model. By comparing with three-dimensional finite-element analysis results and beam on elast...
Article
Full-text available
This paper investigates the loading behavior and soil-structure interaction associated with a floating stone column under rigid foundation by using the discrete element method (DEM). The aggregates and soft soil are simulated by particles with different sizes. The rigid foundation is simulated by two loading plates at the same position with the sam...
Article
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Sand elements in the natural or manmade field have often undergone initial static shear stresses before suffering cyclic loading. To explore the effect of static shear stress, a series of undrained cyclic triaxial tests were performed on dense and loose calcareous sand under different initial and cyclic shear stresses. The triaxial test results are...
Article
Full-text available
Nowadays, a huge number of shield-driven tunnels with noncircular cross sections are constructed in urban areas all around the world. However, the ground displacements associated with tunneling still form a difficult issue, especially for noncircular tunnels. In this study, an analytical solution is derived to estimate the ground displacements indu...
Article
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This paper investigates the temporal-spatial characteristics of ground displacements as well as vertical and horizontal displacements and axial forces in existing piles induced by twin shield tunneling in clays. To that end, a case study and three-dimensional (3D) finite element (FE) analysis were performed. Based on the in situ monitoring data fro...
Article
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Based on complex variable theory and conformal mapping method, the paper presents full plane elastic solutions around an unlined tunnel with arbitrary cross section in anisotropic soil. The solutions describe soil elastic solutions for assuming that the displacement vectors along the tunnel boundary are directed towards the center of the tunnel. Tu...
Article
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Relative density is an important index affecting the mechanical behaviors of calcareous sands. The dense sands present softening strength, whereas the loose sands exhibit hardening strength. Furthermore, the relative density is determined based on the maximum and minimum void ratios obtained by using the maximum and minimum dry density test. In thi...
Article
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This paper investigates the performance of a top-down deep excavation in soil-rock composite stratum. The behavior of the excavation bracing system, consisting of ground anchors and end-suspended piles, has not been well understood due to the lack of relevant research. Based on the observed data of a typical deep excavation case history for the May...
Article
This paper presents an investigation to estimate the minimum cover depth of underwater shield tunnels. Five different conventional methods for minimum cover depth estimation were reviewed and validated based on a case history of underwater shield tunneling in the Swan Lake in Hefei, China. It was found that the Japanese minimum seepage water volume...
Article
Full-text available
Cellular diaphragm (CD) wall, as a new kind of excavation supporting structure without internal bracing system, has not been well studied, despite its successful applications in many engineering practices. Based on incorporating the hyperbolic contact model into a commercial finite element software through FRIC subroutine, this paper presents a fin...
Article
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This paper investigates the influence of the structured property of loess on its compressive behaviour and proposes a new method for determining the preconsolidation pressure of structured loess soil. A series of oedometer tests were carried out on undisturbed and remoulded loess samples prepared at various moisture contents. The effects of moistur...
Article
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This paper proposes a new method for predicting the displacement and internal force of constructed tunnels induced by adjacent excavation with dewatering. In this method, the total excavation-induced additional stress on the constructed tunnel is derived by superposing the additional stresses induced by excavation unloading and dewatering effects....
Article
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Water leakage in tunnels and underground structures is a difficult and challenging problem which must be carefully tackled at any stage of the life-circle of an underground structure or tunnel. In this paper, a review is made of the recent advances in the prevention and mitigation of water leakage in tunnels and underground structures, with the int...
Article
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This paper investigates the triaxial compression behaviour of Q3 loess soil and the construction of a constitutive model accounting for the structural effect of loess on the basis of the disturbed state concept. By analyzing the triaxial compression testing results, we have established a new disturbing function with respect to the volumetric and sh...
Article
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This paper investigates the ground deformation characteristics induced by mechanized shield twin tunnelling along curved alignments by adopting the nonlinear three-dimensional (3D) finite element method (FEM). The performance of the adopted FEM is demonstrated to be satisfactory by comparing the numerical analysis results with the field monitoring...
Article
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Geomaterials such as rock mass often have initial damage under the influence of long-term geological action and hydration corrosion environment. The initial damage affects the integrity and stability of the rock mass, resulting in a difference in the mechanical properties of jointed rock mass and intact one. Therefore, the study of the fracture and...
Article
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Hydraulic fracturing has been widely applied to stimulate the natural gas and oil production from unconventional reservoirs. To optimize the design of hydraulic fracturing in this application, an accurate estimation of the initiation and propagation of hydraulic fractures is indispensable. However, it still remains challenging as a result of the co...
Article
Full-text available
This paper presents an investigation into the evolution law of the structural effects of Xi’an loess soil, based on the disturbed state concept. First, a series of consolidated and drained triaxial compression tests were performed on undisturbed and remoulded loess samples prepared at five different moisture contents and tested at four different co...
Article
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Conventional numerical analysis methods for fiber-reinforced soils involve either cumbersome procedure or neglect of evolving fiber-soil interaction. In this paper, a new numerical analysis method is developed based on the equivalent additional stress (EAS) concept. Fibers' reinforcing effects are treated as compressive stress increments (CSIs) wit...
Article
The seismic response of a tunnel lining structure is essential for its safety design and construction. The objective of this study is to investigate the seismic response of a tunnel lining structure embedded in a thick expansive soil stratum. First, the deformation and internal force characteristics of tunnel lining structure under seismic action a...
Article
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The beneficial role of combining fiber reinforcement with lime stabilization in altering soil behavior has been established in the literature. However, the coupling effect of their combination still remains unclear in terms of its magnitude and microscopic mechanism, especially for natural fibers with special microstructures. The objective of this...
Article
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The objective of this study is to investigate the fracturing characteristics of granite under impact loading. Generation and propagation of cracks from the specimen edge subjected directly to impact loading were captured by the ultrahigh-speed photography. Testing results indicate the existence of a critical impact velocity. At an impact velocity l...
Article
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Modeling approaches to fully capture the behavior of fiber-reinforced clay remain lacking, although the beneficial role of discrete short fibers in reinforcing soils is an established concept. This lack results from tremendous difficulties in characterizing the complex interaction mechanism between fiber and soils. Based on a thorough analysis of t...
Article
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Blast induced rock mass damage and crack propagation play important roles in structure safety and stability in mining, quarrying, and civil constructions. This paper focuses on the effect of small blasthole diameter blast on crack propagation and damage accumulation in water-bearing rock mass containing initial damage composed of inherent geologica...
Article
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In view of the problem that it is difficult to obtain the displacement, internal force and damage status from one beam model established in most numerical analysis models, an improved method for calculating bending moment and shearing force is presented in this paper, which can change this situation. This method portrays how to obtain the internal...
Article
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Based on an extensive list of research work, expansive soil is renowned for its swelling-shrinkage property. Despite the wealth of research, the strength characteristics of expansive soil, which are more complicated than common clayey soil and characterized by a considerable loss of postpeak strength, have not been fully investigated.Within this ar...
Article
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It is vital to control the settlement of ultra-high voltage and long span tower foundation because of the difficult construction and strict deformation control. Based on the thinking of deformation compatibility, the mechanical model of deformation compatibility between pile and soil is established. Relying on the long span tower project Lingzhou–S...
Article
Full-text available
This study was undertaken to research the effects of jute fiber content, fiber length, water content and dry density of reinforced and unreinforced soil on the strength influence mechanism by implementing a series of laboratory tests and analysis. The most efficient fiber reinforcement effects was achieved by means of adding jute fiber with content...

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Projects (4)
Project
Deep excavations in water-rich area inevitably involve a relatively high risk of instabilities, such as water burst, mud gushing, and sand inrush, which might result in large-scale failures imperiling human lives, personnel property, and economic balance. By proposing a Special Issue for Water (IF = 3.530), We are now providing a platform for researchers to report new advances in risk management technologies for deep excavations in water-rich areas and their many applications. Please refer to the website: https://www.mdpi.com/journal/water/special_issues/V8W2XJ3ZP4
Project
1. Estimation of minimum cover depth for underwater shield tunnels 2. Behavior of deep excavation braced with lattice diaphragm walls 3. In-situ protection of shallowly buried pipelines during excavation