Excavation compensation method and key technology for surrounding rock control

He, Manchao; Wang, Qi

doi:10.1016/j.enggeo.2022.106784

Cited by 44 publications

(3 citation statements)

References 18 publications

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“…However, the large deformation of soft rock tunnels is greatly affected by geological conditions, construction technology, and other factors. There are often great differences in geological conditions, supporting parameters, and section design of different tunnel projects [24]. The excavation method should be determined in combination with the actual situation of the site during the design and construction of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Research on Excavation Method for Soft Rock Tunnel Based on Stress Release Rate

Nie,

He,

Kou

et al. 2024

Applied Sciences

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A test method for controlling the stress release rate of the tunnel by adjusting the confining pressure is proposed based on the engineering background of Dongmachang No. 1 Tunnel of Huali Expressway to explore a suitable excavation method of soft rock tunnel. Based on the relationship between stress release rate, displacement release rate, and longitudinal advance of excavation face, the model test of tunnel excavation is carried out. On this basis, combined with the horizontal loading test and field monitoring results, the influence of three excavation methods, the three-bench method, three-bench with reserved core soil method, and three-bench seven-step method, on the mechanical behavior of the tunnel is studied. The research shows that the load shared by the double-layer initial support is not equal, and the second-layer initial support only bears 20% of the pressure of the first-layer initial support; replacing the three-bench method with the three-bench core soil method and the three-bench seven-step method can reduce the deformation of the surrounding rock by 8.7~12.4%, and the load borne by the supporting structure is transferred from the second layer to the first layer. In order to take into account the safety and efficiency of tunnel construction, it is recommended to use the three-bench core soil method for excavation. The research results can provide a theoretical reference for the construction of related tunnel projects.

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Section: Introductionmentioning

confidence: 99%

Research on Excavation Method for Soft Rock Tunnel Based on Stress Release Rate

Nie,

He,

Kou

et al. 2024

Applied Sciences

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“…The damage mechanism and control technology of soft rock roadways has been extensively studied, and in this process, a wealth of theoretical and practical experience is accumulated. In respect of failure mechanisms, He [13,14] systematically studied the characteristics of surrounding rock deformation in high-stress soft rock roadways based on elastic-plastic yield criterion, theoretical mechanics, engineering geology, and other classical theories and analyzed the cause of deformation, disaster evolution rules, and control techniques, which provided guidance for the support design of soft rocks. Mark [15] analyzed the failure mechanisms of the surrounding rock in deep soft rock roadways using UDEC software and proposed that destabilization was mainly caused by high horizontal stress.…”

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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“…With the gradual entry of mineral mining into the era of deep earth, how to safely mine deep coal resources has become an important research topic in view of the engineering characteristics of the "three highs and one disturbance" in the deep part of the earth [4][5][6][7]. Reviewing the research from existing scholars in coal seam mining, either from the law of mineral pressure appearance [8][9][10], from the control technology of surrounding rock [11][12][13], or from the structural characteristics of overburden rock.…”

Section: Introductionmentioning

confidence: 99%

Study on Overburden Fracture and Structural Distribution Evolution Characteristics of Coal Seam Mining in Deep Large Mining Height Working Face

Zhang,

Qin,

Liu

et al. 2023

Sustainability

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Coal mining has gradually entered the deep mining era, and large-height mining is an important way to mine thick coal seams in the deep. The high coal wall will inevitably make the distribution of the overburden structure in the coal mining face more complicated, and the large buried depth will also cause more intense mine pressure. The study of the distribution and evolution of the overburden structure and stress in the mining site can provide theoretical guidance for safe mining. In this work, a physical similarity modeling test was carried out based on the physical–mechanical parameters of overburden rock and similarity theory, taking the mining of a deep, large-height working face in Pingdingshan Coal Mine as an example. The results show that the deformation and breakage of overburden rock in deep, large-height workings occurring during mining is persistent and not only in a short period of time. The breakage form of overburden can be categorized into two types based on the deformation characteristics: (I) non-separation-induced type, and (II) separation-induced type. Among these, the breakage induced by separation can be divided into two categories: (i) dominated by self-weight stress, and (ii) affected by shear cracks. It also summarizes the form of the overburden structure and the structural morphology of the stope. The overburden structure shows a “combined cantilever beam structure-articulated rock-slab structure-non-articulated rock-slab structure”. Among these, the periodic breakage of the upper cantilever beam evolved articulated and non-articulated rock-slab structure in the lower part, which weakened the supporting effect of the lower gangue and further aggravated the breakage of the upper overburden rock. The shape of the main structure of the stope mainly depends on the fracture line from the advancing coal wall to the upper overburden: from a rectangular shape without collapse to a trapezoidal shape at the initial stage of collapse, to a trapezoidal shape with multiple steps after the main roof collapse.

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Excavation compensation method and key technology for surrounding rock control

Cited by 44 publications

References 18 publications

Research on Excavation Method for Soft Rock Tunnel Based on Stress Release Rate

Research on Excavation Method for Soft Rock Tunnel Based on Stress Release Rate

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

Study on Overburden Fracture and Structural Distribution Evolution Characteristics of Coal Seam Mining in Deep Large Mining Height Working Face

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