斯里兰卡排水隧道大直径顶管地面沉降计算和实测分析  

Calculation Method and Field Monitoring Analysis of the Surface Subsudenceby Large-diameter Pipe Jacking in Sri Lanka Drainage Tunnel

作　　者：张建 ZHANG Jian(Zhuhai Institute of Urban Planning&Design,Zhuhai 519000,China;Guangdong Coastal Area Disaster Prevention and Mitigation Engineering Technology Research Center,Zhuhai 519000,China)

机构地区：[1]珠海市规划设计研究院,广东珠海519000 [2]广东省滨海地区防灾减灾工程技术研究中心,广东珠海519000

出　　处：《广东水利水电》2024年第10期35-41,共7页Guangdong Water Resources and Hydropower

基　　金：住房和城乡建设部科技示范项目(编号:2021-S-058)。

摘　　要：以斯里兰卡新姆图瓦和托林顿排水隧道项目为依托,结合现场顶管施工的地面位移监测数据,研究预测密实砂层中大直径顶管地面沉降的经验计算公式,采用数值模拟方法对顶管隧道施工全过程进行研究,分析土体参数、覆土厚度及顶管管径等设计参数对地面沉降的影响规律。研究结果表明:可采用修正Peck经验公式预测密实砂土地质中顶管施工引起的地面沉降量,沉降槽宽度修正系数α的取值范围为1.27~1.70,土体损失率修正系数β取值范围为0.65%~1.26%;砂层摩擦角及顶管管径对地面沉降影响显著,不属于浅覆土顶管时,覆土厚度对地面沉降影响较小,影响变化趋势基本呈线性。Based on the design and building of New Mutwal and Torrington Tunnels projects,combined with the surface subsidence monitoring data of pipe jacking construction,the empirical calculation method for predicting the surface subsidence of large-diameter pipe jacking in dense sand stratum is studied.The numerical simulation method is used to study the whole process of pipe jacking construction,and the influence of design parameters such as soil parameters,cover soil thickness and pipe diameter on ground settlement is analyzed,which provides reference for settlement control measures.The results show that the modified Peck empirical formula can be used to predict the surface subsidence by pipe jacking construction in dense sandy stratum.The settlement trough width correction coefficientαis in the range of 1.27-1.70,and the soil loss correction coefficientβis in the range of 0.65%-1.26%.The friction angle of sand layer and the diameter of pipe jacking have significant influence on surface subsidence,When it does not belong to shallow overburden pipe jacking,the cover soil thickness has little influence on surface subsidence,and the change trend of influence is basically linear.

关 键 词：密实砂层 地面沉降 修正Peck公式 数值模拟 

分 类 号：P642.26[天文地球—工程地质学]