岩体锚固及安全保护试验研究——以库木吐拉千佛洞为例

Rockmass Anchor Mechanism and Protection Experiments——A Case Study of Kumutula Grottoes

岩体严重风化、垮塌和裂隙发育是库木吐拉千佛洞普遍存在的地质环境病害,风化岩体锚固机理的研究和灌浆材料的优选是对洞窟实施有效安全保护的关键。现场试验结果表明:锚固体的破坏产生于岩体与灌浆体的接触面,抗拔力与锚固长度无明显线性关系,存在最佳锚固参数;风化岩体具有良好的可灌性,实现裂隙灌浆的重点只在于材料性能的确定。笔者认为在此基础上进行保护施工必须综合考虑特定环境条件,充分比较材料的优劣,恰当地选择锚固技术和引用PS及PS复合材料。

The paper pointed out that there are universally threats on rockmasses in this region such as serious weathering, collapse and developed fractures.The keys for effective protection of caves are the study of anchor mechanism and the selection of grouting material.The experiments in-situ indicated: the destruction of anchor-rockmass occurred on the interface of rockmass and grouted annulus; there was the nonlinear relationship between pulling force and anchor length, and there would occur the optimal anchoring parameter; the weathered rockmass could be grouted successfully and the key point of cracks grouting would lie in the determination of material function. The paper proposed that we, for the protection, should consider the specific environmental conditions synthetically,compare the quality of the materials fully,choose the appropriate anchor technology and use PS and PS composite.