Study on Refined Back-Analysis Method for Stress Field Based on In Situ and Disturbed Stresses

Jin, Changyu; Lu, Yu; Han, Tao; Chen, Tianyu; Cui, Jianxin; Cheng, Dongxu

doi:10.1061/(asce)gm.1943-5622.0002024

Cited by 16 publications

(3 citation statements)

References 19 publications

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“…Qian et al [19] proposed a method of optimizing the lateral stress coefficient of the initial stress field using a Generative Adversarial Network in FLAC 3D. Jin et al [20] utilized evolutionary neural networks to establish a nonlinear mapping relationship between boundary conditions and measured point stresses, inputting measured in situ stresses into the neural network to acquire the corresponding boundary conditions. However, the above inversion methods primarily focus on stress as the reference quantity and study the stress field in a specific geological body under certain conditions, neglecting the influence of excavation of the rock.…”

Section: Introductionmentioning

confidence: 99%

The Inversion Method Applied to the Stress Field around a Deeply Buried Tunnel Based on Surface Strain

Yan,

Hao,

Yang

et al. 2023

Applied Sciences

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To identify the magnitude and direction of in situ stress in deeply buried tunnels, an inversion method for the stress field was proposed based on a finite number of measurement points of surface strain. Firstly, elastic strain data of finite points on the surface of tunnel surrounding rock were acquired using the borehole stress relief method at the engineering site. Secondly, a finite element model of the tunnel surrounding rock with plastic damage was established, and the parameters of the finite element model were substituted using the SIGINI subroutine. Then, an improved Surrogate Model Accelerated Random Search (SMARS) was developed using genetic algorithm programming on the MATLAB™ platform to invert and attain the globally optimal boundary conditions. Finally, the obtained optimal boundary conditions were applied to the numerical model to calculate the stress distribution in the engineering site. The reliability of this method was validated through a three-dimensional example. The method has been successfully applied to the stress-field analysis of deep tunnels in Macheng Iron Mine, Hebei Province, China. The research results show that this method is a low-cost, reliable approach for stress-field inversion in the rock around a tunnel.

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Section: Introductionmentioning

confidence: 99%

The Inversion Method Applied to the Stress Field around a Deeply Buried Tunnel Based on Surface Strain

Yan,

Hao,

Yang

et al. 2023

Applied Sciences

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“…The occurrence of bedding-controlled rock slope landslides, which can cause significant damage to infrastructure, equipment, and personnel, is one of the major problems that mining engineers must manage [1]. The landslide occurrence in an open-pit mine is influenced not only by internal factors such as geological structure, rock mass properties, and groundwater, but also by external factors such as rainfall, excavation, and blasting vibration [2,3]. The complex factors make it difficult to determine the potential landslide scope and analyze the landslide mechanism.…”

Section: Introductionmentioning

confidence: 99%

A Case Study Integrating Numerical Simulation and InSAR Monitoring to Analyze Bedding-Controlled Landslide in Nanfen Open-Pit Mine

et al. 2023

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Bedding-controlled landslides are a common geological hazard for open-pit metal mines and occur on layered rock slopes. It can spread spatially over the final boundary of the dip slope and persist throughout the entire life cycle of the mine, substantially compromising the safety of mining operations. Identifying potential landslide areas and determining the landslide mechanism is crucial for the safety production and slope management of mines. This study proposes a combination of satellite radar interferometry measurement and numerical simulation to determine the landslide mechanism of the bedding-controlled slope in open-pit mines. First, the multidimensional small baseline subset (MSBAS) technique of interferometric synthetic aperture radar (InSAR) is used to capture deformation information in the vertical and east–west directions of the slope, locate large-scale and long-term movements, and preliminarily determine the trend of landslides. Then, a layered slope damage constitutive model is established, and a three-dimensional stability calculation of the layered slope is performed using COMSOL Multiphysics 5.3 software based on the strength reduction method to study the development and evolution process of landslides. The effectiveness of the method is validated by a large-scale bedding-controlled slope failure in the Nanfen open-pit mine in Liaoning, China, revealing the failure mechanism of the slope under excavation conditions. The study shows that the eastern slope bedding-controlled landslide in the Nanfen open-pit mine is a multizone composite-mode landslide caused by excavation, which belongs to the shear–slip–tension deformation failure mechanism as a whole. This study provides a new method for analyzing the mechanism of layered rock slope landslides under mining activities in open-pit mines, which can be used to assess and predict similar landslides.

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“…Experimental studies of permeability evolution with shear displacement have generally been conducted both with − and without − normal stress considerations. In these experiments, the shear displacement is carried out, meanwhile the permeability is measured with the steady-state method.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Upper and Lower Boundaries of Permeability Evolution during Shale Rock Shear Deformation

Sun

Chen

Zhu³

et al. 2022

Energy Fuels

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Understanding the evolution of permeability during rock shear displacement plays an important role in many geosciences and geo-engineering, such as shale gas exploitation. In previous studies, permeability data were obtained under different experimental conditions with varied in situ stress environments, fracture apertures, or loading stresses. However, the mechanisms controlling the permeability evolution during the shear process have not been well explained. In this study, two special conditions, fractures with constant stiffness (CS) and constant volume (CV), are proposed to define the upper and lower boundaries of permeability evolution. An inverted "L-shaped" model containing a matrix and fracture was established to investigate the permeability evolution and internal morphological changes in the fractures. The impacts of the initial fracture aperture and normal stress in the shear process are discussed together with the apparent fracture aperture, effective flow area, and pore throat radius. Under the CS condition, the self-supporting effect produced by the contact between the upper and lower fracture surfaces plays a dominant role in changing the permeability, and three stages of permeability evolution with shear displacement are observed: rapid increase, slow increase, and decrease. Under CV conditions, the submergence effect of the fracture closed the effective flow channels, thereby reducing the permeability in three stages: rapid decrease, slow decrease, and recovery. The model results show that both a smaller initial fracture aperture or a greater normal stress lead to a greater variation in the permeability and the roughness of fracture surface determines the permeability evolution range. The new model was applied to generate a series of shale permeability evolution boundaries under different limit conditions. These boundaries are consistent with experimental observations reported in other literatures. This work provides new insights into the permeability evolution of rock strata under shear action.

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Study on Refined Back-Analysis Method for Stress Field Based on In Situ and Disturbed Stresses

Cited by 16 publications

References 19 publications

The Inversion Method Applied to the Stress Field around a Deeply Buried Tunnel Based on Surface Strain

The Inversion Method Applied to the Stress Field around a Deeply Buried Tunnel Based on Surface Strain

A Case Study Integrating Numerical Simulation and InSAR Monitoring to Analyze Bedding-Controlled Landslide in Nanfen Open-Pit Mine

Analysis of the Upper and Lower Boundaries of Permeability Evolution during Shale Rock Shear Deformation

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