黄土暗穴对近距隧道施工的影响研究  

Influence of Hidden Holes to Adjacent Tunnel in Loess

作　　者：史思强 

机构地区：[1]河南省尧栾西高速公路建设有限公司,河南洛阳471500

出　　处：《水利与建筑工程学报》2017年第5期167-170,177,共5页Journal of Water Resources and Architectural Engineering

基　　金：西部交通建设科技项目(2011318797600)

摘　　要：为研究黄土暗穴对隧道施工的影响,采用数值模拟方法分析了不同尺寸暗穴对隧道施工过程中的地层位移及围岩和支护受力情况。结果表明:暗穴位于左边墙对隧道围岩水平位移影响明显,暗穴尺寸越大,围岩水平位移值也越大,同一暗穴尺寸,中部断面位移值比端部断面大;暗穴导致隧道周边围岩水平应力变化明显,靠近暗穴一侧的左边墙水平应力尤为明显,右边墙次之,形成一定偏压效应,拱顶和仰拱转变为拉应力;暗穴存在使得隧道支护受力不均,暗穴处应着重加强左右拱脚处支护强度;无论大尺寸暗穴还是小尺寸暗穴断面,二衬整体受力相对较小,满足作为安全储备的要求。In order to analyze the influence of hidden holes to tunnel construction,numerical method was adopted to investigate different size of hidden holes induced surrounding rock displacement and stress. The results show that the hidden holes in lift-side have obviously influence to horizontal displacement of surrounding rock,the bigger the hidden holes,the more obvious the horizontal displacement,the horizontal displacement in the middle section is bigger than the side section at the same size; the horizontal stress induced by the hidden holes changed obviously,the left-side adjacent hidden hole is more obvious,the right side is taking the second place,which lead to bias effect,the stress in vault and invert change to tensile stress,hidden holes makes the tunnel provide uneven support force,where hidden holes should focus on strengthening around the foot of arch support strength; whether large size or small size cavity,the secondary supporting force is relatively small,which can meet requirements as safety reserve.

关 键 词：黄土暗穴 隧道 位移 围岩压力 数值分析 

分 类 号：U455[建筑科学—桥梁与隧道工程]