深埋长距离顶管施工周边土体扰动演变规律（论文）.pdf

·20· 目前，顶管施工现场一般采用土压平衡法或泥水平衡法施工。其中，土压平衡顶管施工方法主要基于土压力平衡的基本原理，并利用顶管机土壤腔内的压力和刀头对土壤进行切排，平衡地下水压力和土压力，从而达到土壤稳定的目的 [1]。深埋长距离顶管施工周边土体扰动演变规律邢鹏飞，袁杰，吴亚华，李品瑞，周煌（核工业井巷建设集团有限公司企业技术中心，浙江湖州 313000 ）　　［摘　要］长距离顶管施工对周边环境的影响不容忽视，以杭州市紫金港科技城220 kV架空线上改下土建一标工程为研究对象，根据具体工程概况，探讨顶管施工中周边土体的扰动理论，通过FLAC3D对深埋长距离顶管推进过程中周边土体的竖向位移云图及开挖工作面处上、下方不同点处的竖向位移值进行了研究。结果表明：在顶管上方周边的土体都产生了竖向向下的微小位移，在开挖面下方周边的土体产生向上的竖向位移，顶管施工对管道上方周边土体的扰动较大，得出对2 m的大直径顶管而言，需要对以顶管前后 50 m，上下4倍管径范围内的土体重点分析研究。　　［关键词］长距离顶管；周边土体；扰动；演变规律　　［中图分类号］ TU 973.23 　　　　［文献标志码］ A　　　　［文章编号］ 1001 -523X （2022 ）19-0020 -05 STUDY ON DISTURBANCE EVOLUTION LAW OF SURROUNDING SOIL DURING DEEP–BURIED LONG–DISTANCE PIPE JACKING CONSTRUCTION Xing Peng-fei, Yuan Jie, Wu Ya-hua, Li Pin-rui, Zhou Huang 　　［Abstract ］ The inﬂuence of long–distance pipe jacking construction on the surrounding environment can not be ignored. This paper takes the civil engineering project of 220 kV overhead line in Hangzhou Zijin Port Science and Technology City as the research object, according to the general situation of speciﬁc projects, the disturbance theory of surrounding soil during pipe jacking construction was discussed, and the vertical displacement nephogram of surrounding soil and the vertical displacement values at diﬀerent points above and below the excavation face were studied by FLAC3D. The results show that the soil around the pipe jacking has slight vertical downward displacement, and the soil around the excavation face has upward vertical displacement. The pipe jacking construction has a great disturbance to the soil around the pipeline. It is concluded that for the large diameter pipe jacking of 2 m, it is necessary to focus on the analysis and research of the soil within the range of 50 m before and after the pipe jacking, up and down four times the pipe diameter. 　　［Keywords ］ long–distance pipe jacking; surrounding soil; disturbance; evolution law 收稿日期：2022–03–11 基金项目：核工业二六二大队科技创新基金（2021003）作者简介：邢鹏飞（1992—），男，山东菏泽人，工程师，主要研究方向为岩土工程、地下工程等。 6 上部结构验算对该建筑的上部结构按抗震设防烈度8 度采取抗震构造措施，通过隔震分析，经隔震加固后结构的水平地震影响系数最大值 αmax1 为0.10。本工程采用双面钢筋网水泥砂浆面层对墙体进行加固，将加固措施输入计算模型中，水平地震影响系数最大值取值为0.10进行计算，图17为隔震结构计算结果，表明墙肢验算均满足规范 [4

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