Mathematical model of coupled Thermo-Hydro-Mechanical (THM) processes and its application in geo-hazards

Liu, X; Wang, E; S.J.Wang,

doi:10.1201/noe0415451369.ch280

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…The hydro-thermal parameters of each layer in the model are sourced from logging data and then calibrated according to the monitoring data of formation pressure and CO 2 migration distance (Xie et al, 2015b;Nguyen et al, 2017), parameters required for mechanical calculation refer to the study of Lei et al (2014).…”

Section: Hydraulic Thermal and Mechanical Parametersmentioning

confidence: 99%

Numerical Simulation of Thermo‐Hydro‐Mechanical‐Chemical Response Caused by CO₂ Injection into Saline Geological Formations: A Case Study from the Ordos Project, China

Fan

Yang

et al. 2023

Acta Geologica Sinica (Eng)

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Thermo‐hydro‐mechanical‐chemical (THMC) interactions are prevalent during CO2 geological sequestration (CGS). In this study, a sequential coupling THMC numerical simulation program was constructed, which can be used to explore the following issues of CGS: fluid and heat flow, solute transport; stresses, displacements and rock failures related to geo‐mechanical effects; equilibrium and kinetic chemical reactions; chemical damage to mechanical properties of the rock. Then, the coupling program was applied to the Ordos CGS Project to study the formation response under the multi‐field interaction caused by CO2 injection. The simulation results show that the mechanical process dominates the short CO2 injection period. Specifically, the formation's permeability near the injection well increases by 43%, due to the reduction of effective stress, which significantly promotes the lateral migration of CO2. When the injection rate exceeds 0.15 million tons per year, the cohesion of the reservoir rock is not enough to resist the shear force inside the rock and rock failure may occur. During the subsequent long‐term sequestration period (200 years), the influence of mineral reactions gradually increases. Due to calcite dissolution, the shear modulus of caprock is predicted to decrease by 7.6%, which will to some extent increase the risk of rock failure.

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Section: Hydraulic Thermal and Mechanical Parametersmentioning

confidence: 99%

Numerical Simulation of Thermo‐Hydro‐Mechanical‐Chemical Response Caused by CO₂ Injection into Saline Geological Formations: A Case Study from the Ordos Project, China

Fan

Yang

et al. 2023

Acta Geologica Sinica (Eng)

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“…The mechanical properties of coal and rock have always been the focus of academic and engineering research. The mechanical properties of coal and rock are easily affected by the occurrence environment (Liu, 2009;Yao et al, 2021). In recent years, with the progress and development of society, a large number of water conservancy and hydropower projects represented by the Three Gorges have been completed and put into use (Deng et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Study on deterioration effect of mechanical properties of coal and rock under water-rock interaction

Chen

Gao

2023

Preprint

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In geotechnical engineering and underground mining engineering, because coal and rock are often immersed in water, the mechanical properties of coal and rock are deteriorated to varying degrees under the action of water and rock. For this reason, water and rock interaction tests were carried out for coal and rock under six kinds of immersing times of 10days,20days,30days,40days,50days and 60days to study the deterioration effect, failure characteristics and deterioration mechanism of their compressive strength, impact characteristics and other parameters, and discuss the progressive instability and damage mechanism of multi-scale coal and rock structure under water rock interaction. The research show that:1) With the prolongation of immersion time, the water content of coal and rock samples increases in varying degrees, finally, it tends to be stable. The increase of water content of coal sample is more obvious than that of sandstone sample. 2) The compressive strength of coal and rock has deterioration effect obvious under the action of water-rock, and the deterioration effect of coal sample is more obvious than that of sandstone sample. The compressive strength of coal sample decreased from 22.55MPa to 11.15MPa, which reduced by 11.40MPa, and the compressive strength of sandstone samples decreased from 66.29MPa to 59.05MPa, which decreased by 7.24MPa, after being immersed in water for 60days. The deterioration effect of the compressive strength of coal and rock is non-uniform, with the prolongation of immersion time the deterioration effect gradually weakens. 3) With the prolongation of immersion time, the impact energy index of coal samples and sandstone samples decreases in varying degrees, and the impact tendency is gradually weakened. The impact energy index of sandstone samples dropped from 4.38 (moderate impact) to 2.65 (weak impact) after coal and rock samples were immersed in water for 60days. The coal samples dropped from 7.41 (strong impact) to 1.18 (non-impact). The impact tendency of coal samples has great impact by water-rock interaction. 4) In view of the crack distribution characteristics of coal-rock sample after failure, the failure characteristics of the samples have great influence by the time of immersion and the material of coal-rock, it is mainly in five aspects: the length of crack, the initiation location of crack, the angle between crack and specimen axis, the number of cracks, and the type of damage. 5) The deterioration effect of mechanical properties of coal under water-rock interaction the result that gradually accumulate by the internal damage of coal and rock. Under the action of water and rock, the micro damage of coal and rock samples are caused by the internal physical and chemical actions. When the damage accumulation reaches a certain degree, the samples will be damaged in the macro. 6) The multi-scale system of coal-rock structure under water-rock interaction is constructed. The water-rock interaction is analyzed from the micro-scale, meso-scale and macro-scale. The three scales are interrelated, influenced and promoted each other. In particular, this effect is more significant under high stress conditions, and the coal rock structure is deteriorated further, eventually leading to instability of system. The research results provide a reference for the prediction of mechanical properties and stability research of engineering rock mass under the environment in which both coal and rock are immersed.

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“…Some problems of slope stability evaluation deal with suitable model on the geological concept, analysis of influence factors, confirmation of deformation and failure mechanism, selection of mechanical parameters in soil or rock, calculative method and sensitivity analysis related with one or multi-factors [1] . Loess landslides are the most common and imperiled geo-hazards in North China, and lots of research [2~5] continuously focus on the types and mechanism of them.…”

Section: Introductionmentioning

confidence: 99%

<i>In Situ</i> Shear Experimental Study on Loess Landslide

Chen

Zhang

Zhao

2011

AMM

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On the basis of analysis on the geological environment of highway loess landslide, three in-situ loess samples,500mm×600mm×600mm, were cut on the shear crack of landslide. The residual shear experiment of soil samples were accomplished in native state and saturated case. Compared with the residual cohesive force and residual internal friction angle of slide face soil in native state by indoor shear experiment, that of landslide shear crack soil in saturated state by in situ shear experiment is grater with the degree of 12.25% and 29.38%.The reason of difference between two experimental methods is proposed. It shows that in situ shear experiment is very important to the landslide stability analysis and the optimization of landslide engineering treating, specially to the creep landslide.

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Mathematical model of coupled Thermo-Hydro-Mechanical (THM) processes and its application in geo-hazards

Cited by 3 publications

References 2 publications

Numerical Simulation of Thermo‐Hydro‐Mechanical‐Chemical Response Caused by CO₂ Injection into Saline Geological Formations: A Case Study from the Ordos Project, China

Numerical Simulation of Thermo‐Hydro‐Mechanical‐Chemical Response Caused by CO₂ Injection into Saline Geological Formations: A Case Study from the Ordos Project, China

Study on deterioration effect of mechanical properties of coal and rock under water-rock interaction

<i>In Situ</i> Shear Experimental Study on Loess Landslide

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Mathematical model of coupled Thermo-Hydro-Mechanical (THM) processes and its application in geo-hazards

Cited by 3 publications

References 2 publications

Numerical Simulation of Thermo‐Hydro‐Mechanical‐Chemical Response Caused by CO2 Injection into Saline Geological Formations: A Case Study from the Ordos Project, China

Numerical Simulation of Thermo‐Hydro‐Mechanical‐Chemical Response Caused by CO2 Injection into Saline Geological Formations: A Case Study from the Ordos Project, China

Study on deterioration effect of mechanical properties of coal and rock under water-rock interaction

<i>In Situ</i> Shear Experimental Study on Loess Landslide

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Numerical Simulation of Thermo‐Hydro‐Mechanical‐Chemical Response Caused by CO₂ Injection into Saline Geological Formations: A Case Study from the Ordos Project, China

Numerical Simulation of Thermo‐Hydro‐Mechanical‐Chemical Response Caused by CO₂ Injection into Saline Geological Formations: A Case Study from the Ordos Project, China