有限空间内盾构施工对土体位移场的影响研究  

Numerical Analysis about Influence from Shield Tunnel on Soil Displacement Field under Enveloped Condition in Soft Soil

作　　者：郭健[1,2] 刘国彬 黄沛[3] 徐磊[2] 黄忠凯 GUO Jian;LIU Guobin;HUANG Pei;XU Lei;HUANG Zhongkai(Department of Geotechnical Engineering,Tongji University,Shanghai,China,200092;Shanghai Construction No.1 Group Co.Ltd.,Shanghai,China,200120;School of Civil Engineering,Chang′an University,Xi′an,China,710061)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]上海建工一建集团有限公司,上海200120 [3]长安大学建筑工程学院,陕西西安710061

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第1期1-8,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(41807242);中央高校基本科研业务费专项资金项目(300102281203);上海市科委科研项目(18DZ1201304,21DZ1204403)。

摘　　要：目的 研究软土地区有限空间区域内盾构施工对临近土体位移场的影响。方法 针对上海地区某新建隧道长距离平行下穿既有地下结构工程,分别建立隧道处于三面围合有限空间及半无限空间条件下的高精度三维数值模型,并将所得计算结果与实测数据进行对比验证。结果 新建隧道于有限空间内施工时不能引起整个有限空间内的土体变形,仅隧道四周的土体会受到较为显著的扰动影响;隧道处于半无限空间开挖引起的土体位移场影响范围约为有限空间条件下开挖引起的土体位移场范围的3~5倍。相较于半无限空间中隧道施工的计算结果,新建隧道于有限空间内施工时大约可减小60%的最大地表沉降值和50%地表沉降范围,但两种条件下地表沉降分布形式基本保持相同。结论 三面围合有限空间对由盾构施工引起的土体位移场有极强的约束作用,在实际施工中可针对该屏蔽效应实施有限空间内的土体加固等措施。This study focused on the influence from the construction of the shield tunnel on the soil displacement field under enveloped situation in soft clay.Based on the project of the construction of shield tunnel in limited space in Shanghai, the integrated numerical models of the construction of shield tunnel under enveloped condition and the construction of shield tunnel in half-infinite space were established, respectively.The field data and computed results were compared to evaluate the accuracy of the numerical models.The results indicated that only the soil near the tunnel in limited space was disturbed significantly.The range of soil displacement field induced by shield tunnel in half-infinite space was 3~5 times larger than that in limited space.The maximum ground surface settlement and the range of ground settlement induced by the construction of tunnel in limited space were 60% and 50%,respectively, smaller than those induced by construction of tunnel in half-infinite space.However, the ground settlement pattern between the aforementioned results were almost the same.This study indicated that the enveloped arear formed by the underground structure and the existing diaphragm wall has significant restraint on the range of soil displacement field.Moreover, the soil reinforcement in enveloped area can be adopted during the construction period.

关 键 词：盾构隧道 有限空间 土体变形 数值模拟 实测数据 

分 类 号：TU433[建筑科学—岩土工程]