Mechanical analysis of water barrier performance of floor layered structure key stratum on coal face

被引：0
|
作者：
Lu, Haifeng [1 ]
Meng, Xiangshuai [1 ]
Zhang, Yuan [1 ]
Yao, Duoxi [1 ]
机构：
[1] School of Earth and Environment, Anhui University of Science & Technology, Huainan,232001, China
来源：
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | 2020年 / 49卷 / 06期
关键词：
According to the characteristics of layered structure of coal measure rock mass and considering the effect of ground stress; the key stratum of water insulation is generalized as a fixed beam subjected to vertical and horizontal loads. The failure modes of it such as generate layering when shearing along bedding plane; compression shear at the end and bending tension are summarized systematically; and corresponding mechanical criteria are given. According to the rotating angle equation and the geometric relationship of the deformation of the composite beam; the contact pressure solution model considering the interlayer slip was established. On this basis; the critical internal pressure of composite beam in key stratum was calculated iteratively. The influence rules of thickness of each beam in composite beam; contact friction; thickness of the key stratum; strength of the bedding surface and lateral pressure coefficient on the impermeability of key stratum were analyzed. The results show that once key stratum changes from the whole to the layered combined stress; bending stress will increase greatly. The stress will be not reduced effectively by increasing contact friction between beams; and the improvement of water blocking capacity will be limited. The greater the thickness of the key layer and the lower the shear strength of the bedding plane; the possibility of delamination along the bedding plane is increased. With the increase of lateral pressure coefficient; the failure mode of key stratum can be changed from overall bending and pulling; shear along bedding plane to overall compression and shear failure. In the actual project; it is necessary to strengthen the exploration and strength test of key stratum's bedding plane; weak interlayer and other structural planes; and accurately analyze the failure mode so as to make judgment of water inrush risk more reliable. © 2020; Editorial Board of Journal of CUMT. All right reserved;
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页码：1057 / 1066
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