Back Analysis of Geomechanical Parameters of Rock Masses Based on Seepage‐Stress Coupled Analysis

Deng, Xianghui; Yuan, Dongyang; Yang, Dongsheng

doi:10.1155/2017/3012794

Cited by 13 publications

(12 citation statements)

References 21 publications

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“…Zhang et al [13] discussed the recognition of linear elastic transverse isotropy rock parameters, the optimized layout of measuring points, and the optimization algorithm by analytic method; this analytical method was only applicable to round tunnels. Deng et al [14] constructed a parameter recognition method based on a fluid-solid coupling model by combining the finite element method and the adaptive genetic algorithm. However, the stress condition of the support structure has not been thoroughly studied.…”

Section: State Of the Artmentioning

confidence: 99%

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Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

He¹,

Linsheng²,

Wang³

2019

JESTR

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The internal forces of primary support obtained by theoretical analysis and numerical simulation often differ significantly from actual data due to the uncertainty of parameters of the surrounding rock and the field construction conditions in tunnels. This study proposed a novel back-analysis method to accurately evaluate the internal forces of the primary support on the basis of radial displacement and contact stress. According to the geometric characteristics and mechanical properties of the primary support in deep tunnels, a mechanical model was established based on theory of circular curved beam. The analytical solutions of these internal forces were then deduced. A case study was conducted to analyze the internal forces of the primary support obtained using the proposed method. Results demonstrate that the internal forces of the primary support of symmetrically loaded tunnels can be directly evaluated by radial displacement and contact stress. The peak-values of internal forces appear in vault, arch springing and the section with a θ angle of 60°. This study provides reference for the dynamic design and optimization of construction for the primary support in tunnels.

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Section: State Of the Artmentioning

confidence: 99%

“…Substituting Eqs. (13)- (14) into Eq. (12), the following complete solution of the governing differential equation can be obtained: = =0 C C can be derived.…”

Section: Solving the Governing Differential Equation With Consideratimentioning

confidence: 99%

Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

He¹,

Linsheng²,

Wang³

2019

JESTR

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“…A reasonable evaluation of the initial stress field of the rockmass becomes very difficult due to all complicated factors. At present, the evaluation methodology for analyzing the initial stress field is mainly based on the in situ stress measurement, and few analytical models are used to construct the initial stress field (Ma et al, 2018;Chen et al, 2018;Wang et al, 2017a;Gao and Ge, 2016;Deng et al, 2017;Pei et al, 2019;Yan et al, 2016):…”

Section: Introductionmentioning

confidence: 99%

An associated evaluation methodology of initial stress level of coal-rock masses in steeply inclined coal seams, Urumchi coal field, China

Shan

Lai

2020

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Purpose This paper aims to present an associated methodology to evaluate the initial stress of coal-rock masses in steeply inclined coal seams. Design/methodology/approach On the basis of the real-time monitoring data in the field, the corresponding analytical analysis is carried out in consideration of the characteristics of topography and geology, so as to deduce the value of the initial stress in the study area and also give the analytical model of the initial stress field. Findings The authors identified feasibility of the initial stress level of coal-rock masses in steeply inclined coal seams, and revealed that exact acquisition on the displacement of surrounding rock was feasible to analyze the initial stress level of coal-rock masses by the back analytical method in the steeply inclined coal seams as a two-dimensional plane problem. Originality/value The calculation results including vertical stress, minimum horizontal principal stress and shearing stress were 7.057, 8.085 and 0.057 MPa, respectively. The KJ743 coal mine initial stress monitoring system was used to collect real-time initial stress data, which were used to check the accuracy of the analytical back results. The value of the vertical stress varied from 6.8 to 7.0 MPa, which is slightly smaller than the result of the back calculation. The minimum principal horizontal stress varied from 7.6 to 8.4 MPa, which is similar to the result of the back calculation.

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“…e freeze-thaw cycle induces the fracture propagation in rock mass and then weakens the mechanical parameters such as elastic modulus and uniaxial compressive strength of rock mass. Deng et al [7] made a back analysis of the rock mass mechanical parameters in the underground project through Seepage-Stress Coupled Analysis. Xu et al [8] and Deng et al [9] studied the energy distribution and transmission process in dynamic compression tests and dynamic tensile tests for different rock types and analysed the variation law of the dynamic energy parameters, absorption energy, reflection energy, projection energy, and other related energy.…”

Section: Introductionmentioning

confidence: 99%

Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle

Huang

Zeng

et al. 2020

Shock and Vibration

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This study is based on the tunnel-face slope engineering of Dongfeng tunnel in Shanxi section of China’s Shuozhou-Huanghua Railway. The sandstone specimens in the perennial freeze-thaw zone of the slope were collected to carry out freeze-thaw cycle static physical mechanics test and split Hopkinson pressure bar (SHPB) dynamic mechanical test. Thus, the damage process of sandstone under freeze-thaw cycle and impact load is studied. Also, the dynamic compressive strength and dynamic elastic modulus of sandstone are analysed under different loading strain rates and freeze-thaw cycle based on LS-DYNA, a dynamic finite element program. The results showed that the dynamic compressive strength of sandstone subjected to multiple freeze-thaw cycles under 0.04 MPa air pressure has a greater damage ratio than that under 0.055 MPa and 0.07 MPa air pressure, which was more likely to cause damage to slope sandstone than in actual engineering; the dynamic compressive strength and elastic modulus of sandstone decrease greatly within a certain range of freeze-thaw cycles and loading strain rate, leading to significant deterioration. When the freeze-thaw cycle exceeded 200 times and the strain rate was greater than 200 s−1, the physical and mechanical properties of sandstone gradually tended to be stable.

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Back Analysis of Geomechanical Parameters of Rock Masses Based on Seepage‐Stress Coupled Analysis

Cited by 13 publications

References 21 publications

Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

An associated evaluation methodology of initial stress level of coal-rock masses in steeply inclined coal seams, Urumchi coal field, China

Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle

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