基于块体理论的深部巷道围岩稳定性分析

Stability Analysis of Deep Roadway Surrounding Rock Based on Block Theory

块体理论说明,对于井下巷道围岩存在节理裂隙的情况,巷道的稳定性取决于岩体结构面与临空面所构成的块体的稳定性。因此,对巷道围岩稳定性分析可以归结为块体稳定性分析。由于关键块体是地下工程开挖后首先失稳的块体,因此被引起高度重视。UNWEDGE软件是分析块体稳定性的有效工具,通过分析可以得出关键块体及其安全系数。针对夹皮沟金矿二道沟矿深部开采复杂地压和岩体节理裂隙情况,运用块体理论及UNWEDGE软件对巷道围岩所做的分析基本符合现场实际,可为合理确定深部巷道支护方案提供指导。

The block theory shows that the stability of the roadway with joint fissures in the surrounding rock depends on the stability of the block formed by the structural plane and the temporary surface of the rock mass. Therefore, the stability analysis of roadway surrounding rock can be attributed to block stability analysis. As the key block is the first unstable block after underground excavation, it was a high degree of attention. UNWEDGE software is an effective tool for analyzing the stability of blocks. The key blocks and their safety factors can be obtained by analysis of UNWEDGE. For the complex mining pressure and the joint fissures of the reck mass in the Erdaogou Mine of Jiapigou Mining Co., Ltd, the surrounding rock was analyzed by the block theory and UNWEDGE software. The results basically in line with the actual situation, which can provide guidance for reasonably determining the deep roadway support scheme.