Xiong Xianyu, Dai Jun, Ouyang Yibo, Shen Pan
School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi, China.
College of Energy Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi, China.
Sci Rep. 2021 Oct 22;11(1):20930. doi: 10.1038/s41598-021-00462-9.
The deformation and failure forms of inclined coal seam roadway under the joint action of dip angle and various geological conditions are complex, and there is a lack of targeted support measures, which brings great problems to the stability control of roadway surrounding rock. In order to safely and economically mine inclined coal seams, taking the engineering geology of Shitanjing No. 2 mining area as the background, and the physical similarity model of right-angle trapezoidal roadway in inclined coal seam, in which the non-contact digital image correlation (DIC) technology and the stress sensor is employed to provide full-field displacement and stress measurements. The deformation control technology of the roadway surrounding rock was proposed, verified by numerical simulation and applied to engineering practice. The research results show that the stress and deformation failure of surrounding rock in low sidewall of roadway are greater than those in high sidewall, showing asymmetric characteristics, and the maximum stress concentration coefficients of roadway sidewall, roof and floor are 4.1, 3.4 and 2.8, respectively. A concept of roadway "cyclic failure" mechanism is proposed that is, the cyclic interaction of the two sidewalls, the sharp angles and roof aggravated the failure of roadway, resulting in the overall instability of roadway. The roadway sidewall is serious rib spalling, the roof is asymmetric "Beret" type caving arch failure, and the floor is slightly bulging. On this basis, the principle of roadway deformation control is revealed and asymmetric support design is adopted, and the deformation of roadway is controlled, which support scheme is effective.
在倾角与各种地质条件共同作用下，倾斜煤层巷道的变形破坏形式复杂，且缺乏针对性的支护措施，给巷道围岩稳定性控制带来很大问题。为安全、经济地开采倾斜煤层，以石炭井二矿工程地质为背景，建立倾斜煤层直角梯形巷道物理相似模型，采用非接触式数字图像相关（DIC）技术和应力传感器进行全场位移和应力测量。提出巷道围岩变形控制技术，经数值模拟验证并应用于工程实践。研究结果表明，巷道低帮围岩的应力和变形破坏大于高帮，呈现非对称特征，巷道帮、顶、底的最大应力集中系数分别为4.1、3.4和2.8。提出巷道“循环破坏”机制概念，即两帮、锐角和顶板的循环相互作用加剧了巷道破坏，导致巷道整体失稳。巷道帮严重片帮，顶板呈非对称“贝雷帽”式冒落拱破坏，底板轻微鼓起。在此基础上，揭示巷道变形控制原理，采用非对称支护设计，控制了巷道变形，支护方案有效。
