Jingmin Xu

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Verified

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• PhD
• Research Fellow at Missouri University of Science and Technology

Tunneling-induced horizontal strains for buildings with discontinuous foundations are notable and may pose significant risks to the integrity of nearby structures. This paper presents results from a series of numerical models investigating the response of framed buildings on separated footings to tunnel construction in sand. The study examines a tw...

Urban tunnelling projects pose significant risks to the integrity of nearby structures due to ground movements induced by the excavation process. Embedded walls are commonly employed as a protective measure to mitigate these adverse effects. This paper presents a comprehensive numerical investigation into the effects of embedded walls on tunnelling...

The displacements and deformations of buildings with separated footings caused by tunneling may be significant and could damage the structures. This paper numerically investigates the influences of building stiffness, geometry, and foundation pressure on the deformation of a two-story elastic framed building due to tunneling in sand. An advanced so...

This technical note investigates the effect of footing embedment depth on tunnel-structure interaction using geotechnical centrifuge testing. A two-story framed building on separate footings, either resting directly on the surface or embedded in the soil, and subjected to tunneling induced displacements is modeled. Measurements of the displacements...

In this paper, the influence of the foundation configuration (raft or separate footings) on tunnel–soil–framed building interaction is investigated using geotechnical centrifuge testing. Tunnelling-induced soil movements and deformation fields, framed building displacements and structure shear distortions (with associated modification factors) are...

During tunnelling with an earth pressure balance (EPB) shield in the sandy soil, the support pressure at the tunnel face depends on the properties of the muck (soil-foam mixture). Five series of foam infiltration tests were performed to investigate the effects of foam expansion ratio (FER), foam injection ratio (FIR), initial pressure gradient at t...

The occurrence of storm surges during typhoons results in the exacerbation of flooding incidents in coastal cities, with road networks vulnerable to inundation facing an intensified risk. This study presents a framework for assessing the flood risk of urban road networks resulting from the storm surge caused by Typhoon Mangkhut in Macau. Tidal chan...

This technical note examines the shear distortion of plane strain framed structures resulting from tunnelling-induced surface differential settlements. An equation for calculating the shear stiffness is derived, considering various structural parameters. The effectiveness of the proposed method is validated through both experimental and finite elem...

In urban area tunnelling projects, preventing the adverse effects of tunnel construction on nearby structures often involves the use of embedded walls or piles. Designing the key parameters of these embedded structures is challenging due to the complex interaction between the soil and the structure. This paper presents a numerical investigation int...

This paper discusses technical aspects of the experimental setup and calibration processing during centrifuge testing of single piles, instrumented with fibre Bragg grating (FBG) strain sensors, under vertical loads. Results illustrate the influence of the pile head connection method and data processing/correction of FBG readings. First, experiment...

In urban shield tunneling, reducing the disturbance of underground construction to the surrounding environment is important for both tunnel engineers and researchers. Among other factors, the quality of synchronous grouting is one of the crucial factors affecting the safe construction of shields. In order to determine a reasonable grouting pressure...

This paper aims to explore the ability of genetic programming (GP) to achieve the intelligent prediction of tunnelling-induced building deformation considering the multifactor impact. A total of 1099 groups of data obtained from 22 geotechnical centrifuge tests are used for model development and analysis using GP. Tunnel volume loss, building eccen...

This paper investigates the role of basement depth on the response of framed buildings to tunnel construction in sandy soil using finite element modelling. Six frames are considered to explore the influences of tunnel cover depth, building width, eccentricity, and the number of storeys on the role of basement depth. The numerical models adopt the h...

This paper presents results from geotechnical centrifuge tests of tunnelling in dry dense sand beneath loaded non-displacement piles, focusing on the effect of a pile cap (representative also of a raft or grade beam) in contact with the soil surface on load transfer mechanisms. Experiments included loading tests to ascertain the foundation capacity...

Artificial construction backfilling columns underground based on coal-based solid waste materials is an important method to slow down surface subsidence and reduce the environmental pollution caused by coal gangue hills and fly ash. Taking the Xinyang coal mine as an example, based on a self-developed non-uniform load application device, acoustic e...

Based on the Taiyuan Railway Station underpass tunnel project, the influence of construction process of closed pipe-roof pre-construction structures on the ground settlement was investigated. Numerical simulations were used firstly to analyze the ground settlement characteristics caused by three types of different jacking pipe sequences, i. e., fro...

When backfilling narrow spaces, controlled low-strength materials (CLSM) can be used to achieve an effective backfilling effect. The pipeline engineering in Yahnghe Avenue of Suqian, China, provides a favorable on-site condition for the use of CLSM. However, no guidance exists for the determination of the material mixture ratio of CLSM for this geo...

To investigate the effects of cement-soil around offshore wind farm rock-socketed steel pipe monopile on the horizontal bearing capacity, a three-dimensional numerical model of clay-cement soil-steel pipe piles was established using ABAQUS. The modelling process and contact settings were improved, and a constitutive model that reflected the cementa...

To reduce tunnelling induced damage of buildings, a 'protective wall' is sometimes constructed between the location of the new tunnel and existing foundations. One of the key design questions relates to the optimal wall depth, where further increase has a limited benefit in reducing structural distortions. This paper presents the results from finit...

Underground coal mining causes stress relief and strata/ground movement, threatening the safety of the surface structures. Investigating the movement laws of the strata above the working face ends is important because it determines the deformation level of the surface subsidence trough at the boundary, which is also the zone with the largest deform...

Soft clay generally cannot be directly used as subgrade material due to its poor engineering characteristics. The application of rice husk ash (RHA) for the solidification of problematic soil contributes to the recycling of waste and reduces carbon emissions. A series of mechanical, chemical, and microscopic tests were conducted to assess the early...

In urban areas, tunnel construction provides a viable solution for developing transport and utility systems. However, tunneling inevitably causes ground movements, threatening nearby structures. This paper aims to investigate the effect of tunnel depth on tunnel-footing interaction using geotechnical centrifuge testing. The experiments considered a...

The paper compares the performance of two FEM approaches in reproducing the response of bare frame structures to tunneling in dry dense sand. A fully coupled approach, in which the tunnel, frame, and soil are accounted for, is compared with a two-stage method incorporating simpler structural and soil models. The two approaches are validated against...

Water outbursts and rock bursts often occur during the mining of coal seams under water-rich sandstone strata with thicknesses exceeding 50 m, otherwise called ultrathick-and-hard strata (UTHS), which are common throughout the mining areas of northwestern China. It is important to understand the behaviors of their movement and the evolution of thei...

Producing cemented rockfill for supplying building material and underground filling material is currently the most effective approach to recycle solid mineral waste. Investigating its ultrasonic property and constructing a model for predicting its strength are of great significance to its on-site assessment and engineering stability. Ultrasonic det...

The ecology of arid mining areas in western China is facing serious problems because underground coal mining destroys overlying aquifers, causing groundwater to shift along fracture zones and groundwater levels to drop. Therefore, it is important to construct strategically coal mine goafs as underground water reservoirs to store and utilize mining-...

One challenge for geotechnical centrifuge testing of soil-structure interaction problems is the reliable measurement of induced structural strains/forces. This paper presents a novel application of fibre Bragg grating (FBG) sensors for strain measurement within geotechnical centrifuge tests. FBG sensors have several advantages for centrifuge testin...

Ground subsidence caused by underground coal mining is one of the challenging environmental issues in mining engineering. This paper presents a field monitoring study of longwall mining-induced ground subsidence in Shendong coalfield, China. The paper includes the subsidence data of four longwall panels, with mining and geological conditions varied...

Engineers need to assess the effects that underground excavations can have on existing structures. Experimental and field data on the tunnel-building interaction problem that accurately consider building characteristics are rarely reported. This paper aims to address this shortcoming by providing results from geotechnical centrifuge tests where tun...

This paper investigates the response of framed buildings on raft foundations to tunnel construction using geotechnical centrifuge testing. Five framed building models were considered and the influence of building configuration, weight, eccentricity, and soil density were evaluated. Soil and foundation displacements, frame deformed shape, maximum st...

The ever-increasing population in the urban environment requires continuous improvement for infrastructure, which often involves tunnel construction. To predict/mitigate tunnelling-induced damage of nearby structures, for instance, surface buildings, engineers need to be able to understand the complex soil-structure interaction mechanisms caused by...

Previous research on tunnelling beneath piles has assumed that caps (or other elements such as grade beams) above the pile head are elevated from the ground surface. This neglects the possible mobilisation of contact stresses beneath the foundation elements at the surface, which may occur as a result of pile settlements larger than ground surface m...

Particle Image Velocimetry (PIV) is a powerful tool used in geotechnical centrifuge modelling to measure displacement and deformation fields in a 2D plane of a model container. Usually, this plane is a lateral wall of the model held by a relatively thick block of transparent acrylic. Consequently, light passing through the acrylic wall undergoes re...

Dynamic loading events in the longwall faces under slopes in the Shendong Coalfield, China, seriously limit the safety and efficiency of mining. The slope characteristics, such as direction, height, and angle, determine the load type and the stability of the voussoir beam structure (VBS) formed by fractured blocks of the primary key stratum (PKS)....

One task facing by the geotechnical engineers is to protect the workspace in an underground construction/excavation site from various forms of geological disasters, such as the water inrush, rock burst, and collapse of the surrounding rock/soil. In this paper, a combined controlling measure was proposed based on underground mining and water environ...

The expansion of cities often involves tunnel construction, which may result in detrimental effects on existing structures. This paper considers the interaction between tunnelling-induced ground deformations and framed buildings on raft foundations. The aim of the paper is to study the differences between scenarios where an equivalent plate and a r...

Mining‐induced voids are the main circulation pathways for underground fluids such as water and coalbed methane. The collapse of these voids transmits to the ground surface, resulting in subsidence and building collapse. Accordingly, effective and feasible solutions are needed to control surface subsidence. In this study, a novel technique of void...

In-situ investigations are the most direct and authentic approach for determining the law of strata movement. In this study, in-situ investigation was carried out to determine the law of fracture and movement of a key stratum. Four-point surface extensometer (FPSE) inside overlying strata and borehole camera observation were used in the overlying s...

Safe and efficient mining of shallow coal seams relies on the understanding and effective control of strata behaviour. Field measurements, theoretical analysis and numerical simulations are presented in this study to investigate the mechanism behind abnormal strata behaviour, such as roof collapse and severe roadway deformation, that occurs in high...

It is of great significance for engineering safety, economic benefits, environmental protection, and sustainable development to investigate the strata stability in filling mining with cemented rockfill. Consequently, this paper is based on a specific coal mine where we applied the fully-mechanized longwall mining and filling and designed a cemented...

In order to determine the filling pace of backfill mining with slurry swelling compound material, a mechanical model of the action relationship between the filling body and roof pressure was established. According to the key stratum theory, the functional expression of the immediate roof load, filling body loading and the filling pace were determin...

Understanding how mining-induced strata movement, fractures, bed separation, and ground subsidence evolve is an area of great importance for the underground coal mining industry, particularly for disaster control and sustainable mining. Based on the rules of mining-induced strata movement and stress evolution, accumulative dilatation of mining-indu...

Longwall chock support failures seriously restrain the safety and high-efficiency of mining of extra thick coal seams, as well as causing a great waste of coal resources. During longwall top-coal caving (LTCC), the influential effect of the properties and the movement regulation of top-coal on strata behavior cannot be ignored, since the top-coal i...

Underground coal extraction causes failure and movement of overlying strata, which could also result in the dislocation of vertical surface boreholes. Investigating the correlation between the dislocation of surface boreholes and the broken of overlying strata is of great significance in deducing the mining-induced dynamic movement of overlying str...

Pre-driven longwall recovery roadways are commonly adopted for rapid extraction in the high-production mines of Shendong coalfield in China. A special roadway, the adapting roadway, is utilized to adapt the longwall roof and floor to match the recovery roadway. However, severe accidents such as roof falls and support failures frequently occurred wh...

In Shendong coalfield, severe support failure accidents caused by the dynamic pressure occurred frequently when longwall faces extracting the lower coal seam progress below the chamber coal pillars. These incidents largely threaten the personnel safety and regular operations. The rationale of the dynamic pressure has been investigated based on the...

The underground catastrophic incidents, such as dynamic mine pressure and support failure, are prone to occur when longwall faces are mined below the upper chamber mining goaf in shallow cover coal seams.Based on a typical case of dynamic mine pressure occurring below the chamber mining goaf in longwall 31201 of Shigetai Mine, the mechanism of this...