真空轻型井点降水在深埋隧道未成岩富水粉细砂层施工中的应用  

The Application of the Vacuum Light-Duty Well Point Dewatering Method to the Construction of Deep Tunnels in Non-Rocky,Water-Rich,Silty Sand Stratum

作　　者：王菀[1] 蒋永强[1] 张文新[1] 陈天恩[1] 

机构地区：[1]中铁隧道集团有限公司技术中心,河南洛阳471009

出　　处：《国防交通工程与技术》2012年第4期57-60,77,共5页Traffic Engineering and Technology for National Defence

摘　　要：真空轻型井点降水在基坑和浅埋隧道施工中应用较多,但很少在深埋隧道中应用,对其降水效果也难以判断。依托兰渝铁路桃树坪隧道洞内降水工程,通过降水管如何设计与施工对真空轻型井点在洞内降水进行了研究。实践证明轻型井点降水在深埋隧道能够达到无水施工的效果,保证了隧道开挖过程中的砂层自稳,并对后续施工提出了改进建议。对类似工程具有参考意义。The vacuum light-duty well point dewatering method is widely applied to the construction of foundation pits and shal- low-buried tunnels,but rarely applied to the construction of deep-buried tunnels, in which case lhe dewatering effect of the method is hard to estimate. Based on the dewatering project of the Taoshuping Tunnel of the Lanzhou-Chongqing Railway, a study is made,in the paper, of the effects of the vacuum light-duty well point dewatering method inside tunnels in regard to how to design and build the dewatering pipes,the result of which shows that by means of the vacuum light-duty well point dewate- ring method, the waterless construction inside deep-buried tunnels can be realized and the stability of the sandy stratum can be ensured during excavation. Some post-excavation construction advice for improvement is also proposed. The paper may serve as a useful reference for other similar projects in the future.

关 键 词：深埋隧道 未成岩富水粉细砂层 真空轻型井点降水 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]