茜阳隧道病害原因分析及处治技术探讨

针对茜阳隧道病害的形式、表现和发展状态,对其病害产生的原因进行了分析,并对隧道开挖方式进行了数值模拟分析,证明偏压、浅埋隧道的施工工序与管理对隧道初期支护变形和裂缝起决定性作用;提出了两种隧道病害整治方法——初期支护拆换扩挖法和明挖法。结果表明,初期支护拆换扩挖法是改善围岩条件、处治病害的最有效的方法。

Cause Analysis and Treatment Measures for Deffects of Qianyang Tunnel

In this paper,causes of deffects in Qianyang tunnel were analyzed in terms of forms,behavior and developing status of deffects.Meanwhile numerical simulation of tunnel excavation procedures was carried out,which proved that the construction procedures and management played a significant role in primary support deformation and cracks in the unevenly-pressured and shallow-buried tunnel.Two deffect treatment measures for Qianyang tunnel were put forward,i.e.the enlarged excavation by parts and open cut method....