Failure mechanisms of soft rock roadways in steeply inclined layered rock formations

Geomatics, Natural Hazards & Risk

Yapeng Liu¹  Xiaohui Zheng²  Zhigang Tao²  Yibo Wang²  Dongsheng Wang²  Manchao He²  Chun Zhu² 

[1] Datong Coal Mine Group;State Key Laboratory for Geomechanics and Deep Underground Engineering;

关键词: Steeply inclined layered structure;    deformation mechanism;    strain curve;    physical model test;    numerical simulation;   

DOI  :  10.1080/19475705.2018.1497712

来源: DOAJ

【 摘 要 】

In recent years, with the increasing depth of coal mining around the world, traditional shallow geology mechanics are no longer suitable for the research on deep geological problems. In terms of deep mining, soft rock roadways in inclined rock formations show different deformation types compared with soft rock roadways in shallow horizontal strata. Based on the –1000 m track contact roadway in Qishan Mine of Xuzhou, physical model tests on the failure process of 45° and 60° inclined layered soft rock formations are carried out using physical models. The real-time monitoring of strain inside the model during the failure of soft rock formation is conducted to explore the failure mechanisms of 45° and 60° inclined layered soft rock formations in terms of in-depth high self-weight stress and horizontal tectonic stress. FLAC3D is also used for numerical simulation and comparative analysis. The roof and floor of the tunnels through 45° and 60° inclined formations fail on the left, and left and right walls fail near the bottom. The maximum displacement of the roof and floor of the 60° inclined formation is larger than that of the 45° inclined formation, and the maximum amount of deformation of left and right walls of the 45° inclined formation is larger than that of the 60° inclined formation, indicating failure features of different steeply inclined layered soft rocks roadways under high lithostatic stress and horizontal tectonic stress can provide a theoretical basis for mining and support of deep roadways.

【 授权许可】

Unknown