Failure analysis and control technology of intersections of large‑scale variable cross‑section roadways in deep soft rock
作者机构：School of Energy and Mining EngineeringChina University of Mining and TechnologyBeijingBeijing 100083China Mine Safety Technology Branch of China Coal Research InstituteBeijing 100013China
出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)
年 卷 期：2022年第9卷第2期
页 面：124-146页
核心收录：
学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 0705[理学-地理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0814[工学-土木工程]
基 金：supported by the National Natural Science Foundation of China(Grant Nos.52074296,52004286) the China Postdoctoral Science Foundation(Grant Nos.2020T130701,2019M650895)
主 题：Deep soft rock Variable cross-section Roadway intersection Bolting-grouting integration New grouting material
摘 要：In deep underground mining,achieving stable support for roadways along with long service life is critical and the complex geological environment at such depths frequently presents a major *** to the coupling action of multiple factors such as deep high stress,adjacent faults,cross-layer design,weak lithology,broken surrounding rock,variable cross-sections,wide sections up to 9.9 m,and clusters of nearby chambers,there was severe deformation and breakdown in the No.10 intersection of the roadway of large-scale variable cross-section at the−760 m level in a coal *** there are insufcient examples in engineering methods pertaining to the geological environment described above,the numerical calculation model was oversimplifed and support theory underdeveloped;therefore,it is imperative to develop an efective support system for the stability and sustenance of deep *** this study,a quantitative analysis of the geological environment of the roadway through feld observations,borehole-scoping,and ground stress testing is carried out to establish the FLAC 3D variable cross-section crossing roadway *** model is combined with the strain softening constitutive(surrounding rock)and Mohr–Coulomb constitutive(other deep rock formations)models to construct a compression arch mechanical model for deep soft rock,based on the quadratic parabolic Mohr *** integrated control technology of bolting and grouting that is mainly composed of a high-strength hollow grouting cable bolt equipped with modifed cement grouting materials and a high-elongation cable bolt is developed by analyzing the strengthening properties of the surrounding rock before and after bolting,based on the Heok-Brown *** a result of on-site practice,the following conclusions are drawn:(1)The plastic zone of the roof of the cross roadway is approximately 6 m deep in this environment,the tectonic stress is nearly 30 MPa,and the surrounding rock is severely fractured.(2)The def
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