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基于锚杆与锚索支护机理分析,采用FLAC3D研究分析不同锚杆与锚索预紧力条件下引起的围岩应力场分布特征,定义了围岩应力扩大系数k来表征围岩应力扩散效果,揭示了锚杆、锚索预应力耦合支护效应。针对极弱胶结地层煤巷矩形断面开切眼导硐工程地质特征,提出了锚网索与工字钢支架联合支护技术方案。采用FLAC3D研究分析了不同支护方案的支护效果,验证了煤巷矩形断面开切眼导硐联合支护方案的合理性,并进行了井下工业性试验。为评价支护效果,对巷道围岩变形与锚杆、锚索受力进行了实时监测,监测结果表明:该联合支护方案有效地控制了矩形断面煤巷围岩变形与塑性区的损伤扩展,保证了围岩与支护结构的稳定和安全。
Based on the analysis of bolt and anchor support mechanism, FLAC3D was used to study the distribution of stress field in surrounding rock caused by different prestressing of anchor bolt and anchor cable. The stress expansion coefficient k of surrounding rock was defined to characterize the stress dispersion of surrounding rock , Reveals the bolt, anchor cable prestressed coupling support effect. In view of the engineering geological features of the open cut tunnel leading to the coal seam with extremely weak cement stratum, the technical scheme for the joint support of the anchor net and the I-beam support is proposed. FLAC3D was used to study and analyze the supporting effect of different support schemes. The rationality of the joint support scheme of the open cut tunnel with a rectangular section in the coal tunnel was verified and the downhole industrial test was carried out. In order to evaluate the supporting effect, the deformation of surrounding rock and the stress of anchor cable and anchor cable were monitored in real time. The monitoring results show that this joint support scheme can effectively control the deformation and plastic zone damage propagation of surrounding rock of rectangular section coal roadway , To ensure the stability and safety of surrounding rock and support structure.