Study on the Instability Characteristics and Bolt Support in Deep Mining Roadways Based on the Surrounding Rock Stability Index: Example of Pansan Coal Mine
Study on the Instability Characteristics and Bolt Support in Deep Mining Roadways Based on the Surrounding Rock Stability Index: Example of Pansan Coal Mine
复制标题
基于围岩稳定指标的深部回采巷道失稳特征及锚杆支护研究——以盘山煤矿为例
DOI：
10.1155/2020/8855335
复制
发表时间：
2020-09-10
影响因子：
1.8
通讯作者：
Pang, Dongdong
中科院分区：
文献类型：
--
作者：
Chang, Jucai;He, Kai;Pang, Dongdong
针对深部矿山开采应力对斜顶巷道围岩稳定性的影响，基于岩石强度准则和应力分布，定义并求解了围岩稳定性指标。以潘三矿17102（3）工作面回采巷道为工程背景和实例。根据围岩稳定性指标和变形数据，分析了无支护和锚杆支护条件下的围岩稳定性。结果表明：矮墙和高墙失稳面积分别为1.68 m2和2.12 m2，矮墙比高墙稳定;顶底板失稳面积分别为0.33 m2和0.35 m2，顶底板比两侧稳定。在开采过程中，失稳区域先大幅度增大，然后减小到0，并在支承压力峰值时达到最大值。围岩稳定性先降低后升高。与端部锚杆支护相比，全长锚杆支护更大程度上减小了失稳区域，支护效果更好。端部锚固区和全长锚固区围岩分别在距工作面200 m和150 m处开始发生明显变形。这表明全长锚杆支护的控制效果较好，验证了围岩稳定性指标描述失稳特征的合理性。该研究方法可为分析不同断面巷道的稳定性特征和支护设计提供理论参考。
In view of the influence of mining stress on the stability of the surrounding rock of inclined roof mining roadways in deep mines, the surrounding rock stability index is defined and solved based on the rock strength criterion and the stress distribution. The mining roadway of the 17102(3) working face of the Pansan Coal Mine is used as the engineering background and example. The surrounding rock’ stabilities under the conditions of no support and bolt support are analyzed according to the surrounding rock’s stability index and the deformation data. The results show that the areas of low wall and high wall instability are 1.68 m2 and 2.12 m2, respectively, and the low wall is more stable than the high wall; the areas of the roof and floor instability are 0.33 m2 and 0.35 m2, respectively, and the roof and floor are more stable than the two sides. During mining, the area of instability greatly increases at first, then decreases to 0, and reaches a maximum value at the peak of the abutment pressure. The stability of the surrounding rock decreases first and then increases. Compared with the end anchoring bolt support, the full-length anchoring bolt support reduces the area of instability to a greater extent, and the full-length anchoring bolt support effect is better. The surrounding rock in the end anchoring zone and the full-length anchoring zone began to deform significantly at 200 m and 150 m from the working face, respectively. This indicates that the control effect of the full-length anchoring bolt support is better and verifies the rationality of the surrounding rock stability index to describe the instability characteristics. This research method can provide a theoretical reference for analysis of the stability characteristics and support design of different cross-section roadways.