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He H.,China University of Mining and Technology | Dou L.-M.,China University of Mining and Technology | Gong S.-Y.,China University of Mining and Technology | Wang L.-L.,Huating Coal Group Ltd. Co. | And 2 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering

Based on the analysis of "strong-soft-strong" and layer-crack-plate model of rockburst roadways, we study the prevention mechanism, the supporting type, and the requirements of the "strong structure" formed by support system are studied in this paper. The results indicate that the high-strength and pretension bolting support as an active technology can not only efficiently prevent the rockburst from taking place but alsoincrease the critical stress of fractures characterized by instable extension. We also studied the characteristics of dynamic stress and deformation of the roadway surrounding and anchor body subjected to impact load using the energy conservation law and point out that the "strong structure" formed by support system in rockburst roadways should have an active yielding function which can guide and control the release and translation of the energy. The roadway surrounding rock and its support system can resist the rockburst and remain stable as the energy dissipates in the process of active yielding of this structure. We further point out that 1) the "strong structure" must have the active high strength support and yielding function named "double strong" function, and 2) the high-strength-yielding bolt can satisfy this requirement and so is regarded as an effective support form to prevent and resist the rock burst. The significant effects are proved through in-site application. Source

Qi J.D.,University of Science and Technology of China | Qi J.D.,Huating Coal Group Ltd. Co. | Zhang D.D.,University of Science and Technology of China | Zhang D.D.,Shaanxi University of Science and Technology | And 8 more authors.
Transit Development in Rock Mechanics-Recognition, Thinking and Innovation - Proceedings of the 3rd ISRM Young Scholars Symposium on Rock Mechanics, 2014

In order to control Quaternary loose layer settlement in East China, there are monitoring results based on the 3 water level observation holes and 7 sand layer of Fiber Bragg Grating (FBG) strain sensor. Under the conditions of upper group water injecting to lower group of loose layer, the deformation characteristics of upper, middle and lower group of loose sandy soil layer changing with time and relationship with the water level are studied. The constitutive relation of stress-strain is also studied at different sand layers. Research results show that using water injecting from upper group into lower group of loose layer can ease the loose layer compression deformation. With the water level dropped, in East China soil creep deformation occurred, which accord with viscoelasto plastic model. The deformation of lower sand group has clear later effect and no direct relationship with water level. The results provide an important basis for the study East China stratum settlement model and water management. © 2015 Taylor & Francis Group, London. Source

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