Mechanism of rock deformation and failure and monitoring analysis in water-rich soft rock roadway of western China

Meng, Qinglin; Han, Lijun; Qiao, Weiguo; Lin, Dabin; Liu, Yang

doi:10.1007/s12404-012-0307-5

Cited by 15 publications

(13 citation statements)

References 1 publication

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“…Considering the stratified roof structural characteristics of full-coal roadway with a large cross-section, Zhang et al [13,14] investigated the deformation characteristics of the separation layer on a stratified roof after tunneling by using state nonlinear simulation method of interlayer contact surfaces. Based on analysis of the deformation failure characteristics of soft rock roadway, Meng et al [15][16][17] studied the deformation failure mechanism of surrounding rocks in weakly consolidated soft rock roadway; they also investigated and supervised surrounding rock evolution laws in the roadway as well as optimized support design. Li et al [18] analyzed the deformation failure process of rectangular roadway of weakly consolidated soft rocks and compared simulation results with field supervision results.…”

Section: Introductionmentioning

confidence: 99%

Roadway Instability Mechanism of Weakly Consolidated Soft Rocks and Support Technologies

Cai

Chai

et al. 2023

Geofluids

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During tunneling in weakly consolidated soft rock strata, lithology, joints, and fractures of rock strata play an important role in controlling overall roof stability of the roadway. A case study based on weakly consolidated soft rock roadway in Bojianghaizi mine was conducted to address disasters caused by sudden changes and collapse as well as difficulties in maintenance of weakly consolidated soft rock roadway. First, physical and mechanical properties of weakly consolidated soft rocks were investigated by X-ray diffraction mineral component analysis and scanning electron microscopy. Second, failure characteristics and instability mechanism of the roadway were analyzed by combining field survey and theoretical analysis. A mechanical model of fracture development on the composite roof of the roadway was built, and the initiation angle and critical stress for fracture development were deduced. The instability criteria of cracks based on cracking angle ( θ 0 ) were established. Moreover, the instability mechanism caused by roof falling was disclosed. Fractures were formed upon shear failure at vertex angle of the roadway. The fracture belt extended to the soft bedding plane of the separation stratum along the fracture propagation angle and connected with it, thereby inducing roof falling. On this basis, a high-strength and high-preload “inverted trapezoidal” anchoring mesh-beam string supporting structure + arched roadway cross-section with vertical walls + full-section guniting coupling control technology was proposed, which achieved good site application effects.

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Section: Introductionmentioning

confidence: 99%

Roadway Instability Mechanism of Weakly Consolidated Soft Rocks and Support Technologies

Cai

Chai

et al. 2023

Geofluids

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“…Huang [18] analyzed the distribution and evolution characteristics of plastic damage zones in the surrounding rock of deep loop roadways with unequal pressure under high stress. Meng [19] researched the geotechnical characteristics of high-stress soft rock roadways using a viscoelastic rheological model and concluded that the surrounding rock featured the rheological properties of attenuated and stabilized deformation. Zhao [20] studied the local stress field of deep roadways and revealed their asymmetrical deformation failure mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Deformation Failure Characteristics and Maintenance Control Technologies of High-Stress Crossing-Seam Roadways: A Case Study

Xie

Xiang

et al. 2023

Applied Sciences

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The surrounding rock structure of the crossing-seam roadway is poor and is susceptible to anchorage failure phenomena, such as top plate sinking and convergence deformation under high ground stress. These issues can cause significant deformation of the surrounding rock over time, resulting in challenging engineering problems. To address this issue, we studied the failure modes and destabilization mechanisms of the surrounding rock in different crossing-seam roadways by field tests and numerical simulations. The results show that since the rock strata in these roadways are extremely unstable and highly susceptible to high horizontal stress, the weak surrounding rock presents the mode of full-section plastic failure. The roof is damaged more seriously than the floor and both walls. In this case, the basic anchorage layer in the original scheme is not thick and rigid enough to support these roadways. Thus, the surrounding rock deforms severely and persistently, which is one of the engineering failure characteristics. To solve this problem, a new scheme of “prompt thick-layer end anchorage + full-length lag grouting anchorage + secondary continuous reinforcement” was proposed based on the continuous roof control theory. According to the industrial test, this scheme can successfully control the long-term large deformation of the weak surrounding rock in crossing-seam roadways. Notably, the deformation of the top plate decreased by 56.65% and the deformation of the two walls decreased by 66.35%. Its design concept will provide important references for controlling the surrounding rock in similar soft rock roadways.

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“…e soft rock is integral, exhibits considerable mechanical strength in its natural state, and has been selected as a backfill subgrade material. However, this material softens easily or even collapses after the impact of water [1][2][3]. Consequently, the mechanical properties are obviously reduced, significantly influencing the safety of engineering facilities such as expressways, highspeed railways, and airport runways [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Research on water-rock interactions has been a very popular topic because the results have important guiding significance for engineering safety. e most intuitive results of these studies showed that the mechanical strength of the rock produces a significant reduction due to the presence of water [3,[6][7][8][9][10]. Moreover, how water weakens rocks has also been investigated to explain the intrinsic drive of water-rock interactions.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Soft Rocks Subjected to Water‐Rock Reaction and Cyclic Pressure

Huang

Feng²,

et al. 2022

Advances in Civil Engineering

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Studying the mechanical properties of soft rocks subjected to water and cyclic loading would contribute to a better understanding of the stability analysis of soft rock engineering under the conditions of storm and carrier dynamics. In this paper, two soft rocks from Southwest China (i.e., muddy siltstone and silty mudstone) were selected as test samples. Uniaxial compressive tests were applied to investigate the strength and deformation characteristics under water-rock reactions. Meanwhile, triaxial tests were carried out to analyse the fatigue damage and failure characteristics by applying cyclic axial loading under different confining pressures. The results indicated a reduction in the uniaxial compressive strength (UCS) under saturated conditions, which is correlated with the disintegration resistance of soft rocks. Moreover, the samples exhibited a softening phenomenon due to water absorption and rock expansion, decreasing the elastic modulus. The triaxial tests demonstrated that axial strain accumulated with the number of loading cycles due to fatigue and even failed when applying increased cyclic loading with certain cycles. The cohesion decreased during cyclic loading, but the friction angle was relatively independent of the number of cycles. In addition, reductions in the dynamic elastic modulus and shear modulus decreased with increasing loading time. This study indicated that water and cyclic loadings could cause significant degradation of the strength and stiffness of soft rocks, which need to be considered carefully during the engineering utilization of such materials.

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Mechanism of rock deformation and failure and monitoring analysis in water-rich soft rock roadway of western China

Cited by 15 publications

References 1 publication

Roadway Instability Mechanism of Weakly Consolidated Soft Rocks and Support Technologies

Roadway Instability Mechanism of Weakly Consolidated Soft Rocks and Support Technologies

Deformation Failure Characteristics and Maintenance Control Technologies of High-Stress Crossing-Seam Roadways: A Case Study

Mechanical Properties of Soft Rocks Subjected to Water‐Rock Reaction and Cyclic Pressure

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