Model test and stress distribution law of unsymmetrical loading tunnel in bedding rock mass

Liu, Xinrong; Chen, Hongjun; Liu, Kun; He, Chao

doi:10.1007/s12517-017-2949-5

Cited by 20 publications

(6 citation statements)

References 21 publications

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“…where l refers to the geometry size of rock B, S is the dip length of the panel, and L is the periodic fracture length of the main roof. From field measurements of the 8107 panel, the periodic fracture length of the main roof was 23 m. e dip length of the 8107 panel was 210 m. From equation (10), the rock B geometry size l was 24.5 m. e geometry size of 24.5 m was greater than the total width of the roadway and pillar, and the roof above the roadway was suspended. is conclusion was basically consistent with the simulation result (Figure 12(a)).…”

Section: Discussion Of the Roadway Roof Mechanical Behaviourmentioning

confidence: 99%

“…Model tests are common methods used to simulate roadway failure processes. Liu et al [10] adopted model testing to research the roadway stress distribution in bedding rock masses with asymmetrical loading. Based on an analysis of infrared and displacement field images, Sun et al [11] investigated the deformation failure mechanism of surrounding rocks during roadway excavations by physical model tests.…”

Section: Introductionmentioning

confidence: 99%

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Stability Control Mechanism of High‐Stress Roadway Surrounding Rock by Roof Fracturing and Rock Mass Filling

Yang

et al. 2021

Advances in Civil Engineering

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Large deformation of roadway and coal bump failures have always been the focus in deep underground engineering. By considering the Lu’an mining district in China, the failure mode and stability improvement process of high-stress roadways were analysed with the field tests and numerical simulations. The field test results showed that a great amount of deformation and serious damage occurred in surrounding rocks during panel retreat due to the suspended roof. A novel approach employing roof fracturing and collapsed rock filling effect was adopted to maintain the roadway stability. A numerical model was established with the Universal Distinct Element Code (UDEC) to research the fracturing characteristics between the roadway and gob roofs and the stress change in the surrounding rock. The modelling results demonstrated that, without fracturing roof, the peak vertical stress of the coal pillar was 18.3 MPa and the peak vertical stress of the virgin coal rib was 15.6 MPa. The roadway was in a state of high stress. With fracturing roof, the peak vertical stress of coal pillar was 9.3 MPa and the peak vertical stress of virgin coal rib was 13.4 MPa. The fractured rock mass in the gob expanded in volume and provided supporting resistance to the overlying strata, which relieved stress concentrations in the coal pillar. Field measurement results indicated that the roadway large deformation was successfully resolved during excavation and panel retreat after implementing the novel approach, providing useful references for the application of this novel approach in similar coal mines.

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Section: Discussion Of the Roadway Roof Mechanical Behaviourmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability Control Mechanism of High‐Stress Roadway Surrounding Rock by Roof Fracturing and Rock Mass Filling

Yang

et al. 2021

Advances in Civil Engineering

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“…Numerical studies on shallow-buried biased tunnels have been conducted worldwide. The deformation and mechanical behaviors of surrounding rock were revealed by characterizations of rock mass deformation (Song et al, 2018), ground surface settlement (Wang et al, 2019), surrounding rock pressure (Liu X. R. et al, 2015;Liu et al, 2017;Zhang et al, 2022), surrounding rock stress field with different bias coefficients (Qiu et al, 2022), and sensitive factors in the surrounding rock loosening zone (Qiao et al, 2021). In addition, model tests were carried out to examine surrounding rock pressure and internal force distribution of supporting structure under different terrain conditions (Lei et al, 2015;Gao and Guo, 2016), and to evaluate the effects of water immersion (Liu and Lai, 2020;Zhang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Mechanical behaviors of surrounding rock and supporting structure of shallow-buried unsymmetrical pressure tunnel crossing soil–rock interface

Zhang

Wang

et al. 2023

Front. Earth Sci.

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Shallow bias tunnels are sensitive at the entrance section, where the existence of soil–rock interface (SRI) results in more complex deformation of surrounding rock and supporting structure. This study investigates the mechanical properties of surrounding rock and supporting structure of a shallow-buried bias tunnel crossing the soil–rock interface by a combination of model tests and numerical simulations. A shallow-buried biased tunnel with significant cracking at its entrance section is selected in southwest China. The plastic zone distribution, deformation, and pressure of surrounding rock, as well as the stress and deformation of supporting structure, are analyzed under different conditions with the tunnel vault, arch haunch, arch spring, and wall foot crossing the soil–rock interface. The test and numerical results show that the internal force of the lining structure is the largest at the left arch haunch and the right arch spring, with cracks occurring in the project. The surrounding rock and supporting structure are most prominently influenced by the arch haunch and arch spring crossing the soil–rock interface among different positions of the tunnel. The supporting structure is subjected to stress in three modes: there is mainly shearing when the tunnel vault passes through the soil–rock interface, extrusion and shearing co-exist when the tunnel arch haunch and arch spring pass through the soil–rock interface, and extrusion is dominant when the tunnel wall foot passes through the soil–rock interface. Inserting grouting steel pipes perpendicular to the soil–rock interface on the deep-buried side of the tunnel can effectively control the deformation of surrounding rock and the stress of supporting structure.

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“…By conducting a large-scale geological model test, Li et al (2015) investigated the deformation law of the roadway surrounding rock and proposed an anchor box beam system supporting system to control the deformation. Liu et al (2017) adopted a model test to study the stress distribution law of tunnel in bedding rock mass with asymmetrical loading.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Roof Presplitting and Rock Mass Filling Approach on Controlling Large Deformations and Coal Bumps in Deep High-Stress Roadways

2019

Lat. Am. j. solids struct.

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Roadway deformation and coal bumps are major challenges for underground engineering. Taking the Lu'an mining district in Shanxi Province as an example, the failure mechanism of deep high-stress roadway was studied. Numerical simulations and the similar material test were performed to investigate the effect of the roof presplitting and rock mass filling on the stability of roadway surrounding rock. The change laws and distribution features of stress and plastic zone, and the fracture characteristics of roof strata were analyzed. Under conditions where the roof was not presplit, the roadway was in a high-stress environment due to the massive suspended roof. The failure process of the high-stress roadway began with tensile crack in the shallow roof and then extended to the two ribs, resulting in the yield of a coal pillar. Under the condition that the roof was presplit, the peak value of the vertical stress at the coal pillar was decreased from 18.2 to 9.8 MPa while that of the virgin coal rib was decreased from 15.8 to 13.5 MPa. Both the similar material test and numerical results showed that the Roof outside the Coal Pillar (RCP) was cut off along the presplitting lines and was fractured into different sizes of masses. The broken rock mass filled in the goaf and supported on the overlying strata, which reduced the load on the coal pillar. The field monitoring data indicated that implementing the roof presplitting and rock mass filling processes successfully controlled large deformations of the roadway and coal bumps, which improved the stability of surrounding rock.

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Model test and stress distribution law of unsymmetrical loading tunnel in bedding rock mass

Cited by 20 publications

References 21 publications

Stability Control Mechanism of High‐Stress Roadway Surrounding Rock by Roof Fracturing and Rock Mass Filling

Stability Control Mechanism of High‐Stress Roadway Surrounding Rock by Roof Fracturing and Rock Mass Filling

Mechanical behaviors of surrounding rock and supporting structure of shallow-buried unsymmetrical pressure tunnel crossing soil–rock interface

Investigation of the Roof Presplitting and Rock Mass Filling Approach on Controlling Large Deformations and Coal Bumps in Deep High-Stress Roadways

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