黏土浅埋隧道开挖面稳定性模型试验研究  

Model test study of the face stability of the shallow tunnel in the clay

作　　者：邹金杰[1] 赵宇[2] 李姣阳 甘鹏路[4,1] 闫自海[1] 刘维[5] 

机构地区：[1]中国电建集团华东勘测设计研究院,浙江杭州311122 [2]浙江大学防灾工程研究所,浙江杭州310058 [3]中铁第四勘察设计院集团有限公司,湖北武汉430063 [4]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [5]苏州大学城市轨道交通学院,江苏苏州215131

出　　处：《西安建筑科技大学学报（自然科学版）》2017年第4期478-484,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金青年基金(51508503);浙江省自然科学基金(LY16D020002);华东勘测设计研究院科技项目(KY2013-02-30)

摘　　要：为研究不同加固条件下黏土隧道开挖面失稳发展过程及地表变形规律,采用轴对称半隧道模型,进行了无加固、管棚加固和"管棚+水泥土"加固条件下的三组试验,研究了开挖面支护力、地表沉降规律和开挖面失稳发展过程.研究发现,管棚加固后的土样地表沉降明显减小,而水泥土加固对地表沉降的减小作用有限.随着支护板位移增大,支护力出现快速下降阶段、稳定阶段和丧失阶段.开挖面失稳过程中,土体变形出现主要变形区域、次要变形区域和变形延伸区域.管棚加固或"管棚+水泥土"加固能延缓变形向地表发展,"管棚+水泥土"加固还能降低开挖面附近土体变形大小和范围以及支护力的大小.In order to study the development of the tunnel face instability in the clay under different conditions of reinforcements, by using of symmetry, half of the tunnel model was introduced to conduct three tests for no reinforcement, pipe-shed reinforcement and ＂pipe-shed ＋ cemented soil＂ reinforcement. Support pressure on the excavation face, ground deformation and the instability mode of the tunnel face were investigated. It was found that the surface settlement decreased remarkably after the pipe-shed reinforcement, while the effect of the cemented soil reinforcement on the reduction of the settlement was limited. With the increase in the face displacement, the support pressure appeared three stages i. e. the rapid decline stage, steady stage and disappearing stage. During the process of the tunnel face instability, the soil deformation appeared three regions, i.e. the main deformation areas, secondary deformation areas and the extended areas. The pipe-shed reinforcement or ＂pipe-shed ＋ cemented soil＂ reinforcement can delay the development of soil deformation toward the surface, and the latter can also reduce the value and scope of the soil deformation near the excavation face and the support pressure of the excavation face.

关 键 词：开挖面失稳 模型试验 地表沉降 管棚加固 土体变形 

分 类 号：TU41[建筑科学—岩土工程]