断层对隧道围岩稳定性的影响

INFLUENECE OF FAULT CRUSH BELTS ON THE STABILITY OF TUNNEL ROCK

针对隧道开挖过程中的隧道围岩稳定性问题,将地质力学中构造体系的复合及构造演化应用到隧道围岩稳定性分析中去,分析了各种力学性质的单一式断层、归并复合式断层以及断层交会等的特点和对隧道围岩稳定性的影响,并通过厦门海底隧道现场实例加以验证。研究结果显示,断层交会和断层归并复合很容易引起围岩失稳,断层的其他要素如风化程度、断层走向与隧道中线走向的夹角对围岩稳定性影响也很大。研究为隧道施工提供了有意义的借鉴。

The stability of tunnel rock is vital to tunnel construction. By applying the compounding of tectonic systems and tectonic evolution of geomechanics, an analysis has been made on features of single fault crush belts, compound fault crush belts, conjoining fault crush belts, and their influence on stability of tunnel rock, which were confirmed in the field cases of Xiamen sub-sea tunnel. The results show that conjoining fault crush belts and compound fault crush belts can easily lead to unstability of rock, and other factors of faults, such as weathering and the angle between faults strike and tunnel axis strike, also have obvious influence on stability of tunnel rock. The study can offer significant reference for tunnel construction.