近距隧道暗挖施工诱发地层变形规律的模型试验研究  

Model Test Research on the Law of Strata Deformation Induced by Constructing Close-Spaced Tunnel with Subsurface Excavation Method

作　　者：王忠昶[1] 赵德深[2] 吴会军[1] 

机构地区：[1]大连交通大学土木与安全工程学院,辽宁大连116028 [2]大连大学建筑工程学院,辽宁大连116622

出　　处：《中国铁道科学》2013年第6期49-54,共6页China Railway Science

基　　金：国家自然科学基金资助项目(51009015;51274051);辽宁省教育厅科学技术研究项目(L2010038)

摘　　要：以大连市地铁1号线双洞单线隧道为实例，应用相似原理和单轴压缩试验获得土层的最优相似材料配比，用以在实验室建立双洞单线隧道模型，量测模型不同位置处的表面位移，据此分析左、右隧道先后施工诱发的地层变形规律。结果表明：在隧道施工的前72h内，地层沉降达到最大沉降量的70％～80％；先掘的左线隧道一侧的地层沉降较大；随着地层深度的增加，地层沉降逐渐增加，地层沉降曲线非对称“双峰”特征越明显；两隧道轴线上的地层水平位移随着地层深度的增加近似成线性减小，两隧道中心线和轴线上的地层水平位移不再为0，隧道两侧上方的地层水平位移变化最为剧烈，此区域出现较明显的剪切层，并且该区域原有的桩基、剪力墙在隧道开挖时因受到附加剪切作用而易出现裂缝。With the double-hole and single-track tunnel of Dalian Metro Line 1 as example, the optimal ratio of similar materials for soil layers was obtained by similarity principle and uniaxial compression test to construct double-hole and single-track tunnel model in laboratory. The surface displacements at different locations of the model were measured and accordingly the law of strata deformation induced by the succes- sive construction of the left and right tunnels was analyzed. Results show that the ground settlement rea- ches 70~80% of the maximum settlement within the first 72 h after tunnel construction. The ground settlement is greater in the left-line tunnel which is excavated first. Along with the increase of strata depth, the ground settlement increases gradually and the asymmetrical ＂double-peak＂ characteristics of ground settlement curve are more obvious. The horizontal ground displacement on the axis of two tunnels approximately decreases linearly with the increase of strata depth. The horizontal ground displacement in the locations of center line and axis of two tunnels is no longer 0. The change of the horizontal ground dis- placement above both sides of tunnel is the most violent, in which obvious shear layer appears. The original pile and shear wall within this range is liable to crack under additional shear action owing to tunnel excavation.

关 键 词：双洞单线地铁隧道 矿山法 模型试验 

分 类 号：U456.1[建筑科学—桥梁与隧道工程]