粉土地层双线平行顶管地面沉降及注浆压力数值研究  

Numerical study on ground settlement and grouting pressure of doubleline parallel pipe jacking in silty soil stratum

作　　者：张昌桔 姚言 应宏伟 李冰河[4] ZHANG Changju;YAO Yan;YING Hongwei;LI Binghe(Hangzhou Municipal Engineering Group Co.,Ltd.,Hangzhou 310014,Zhejiang,China;Zhejiang Institute of Communications Co.,Ltd.,Hangzhou 310030,Zhejiang,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,Jiangsu,China;Zhejiang Province Institute of Architectural Design and Research,Hangzhou 310005,Zhejiang,China)

机构地区：[1]杭州市市政工程集团有限公司,浙江杭州310014 [2]浙江数智交院科技股份有限公司,浙江杭州310030 [3]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024 [4]浙江省建筑设计研究院,浙江杭州310005

出　　处：《地基处理》2025年第1期60-68,共9页Journal of Ground Improvement

基　　金：国家自然科学基金项目(51678523);浙江省建设科研项目(2018K025,2020K108);杭州市建设科研项目(2018027,2020013)。

摘　　要：基于杭州某大直径双线平行顶管施工案例,采用Plaxis 2D软件对双线顶管施工引起的地表沉降进行二维有限元分析,通过左线顶管施工计算结果与实测数据的对比验证了参数选取的合理性,在此基础上进一步分析了注浆压力与先行顶管施工对地层扰动的影响。结果表明:顶管穿越区域的砂质粉土地层经全方位高压喷射(MJS)工法的加固作用,土体性质得到进一步改良,开挖隧洞附近土体能够充分发挥自身的承载力,只需施加较小的注浆压力即可保证管节周围土体的稳定性,建议控制注浆压力不小于0.8倍管顶水压力或者0.4倍管顶上覆土压力;先行顶管顶进对管周土体产生扰动,继而增大近距离后行顶管引发的地面沉降,可采用弱化顶管周围土体来模拟先行顶管施工扰动影响,双线平行顶管工程对后行顶管可适当增大触变泥浆的注浆压力以减小地面沉降。Based on a large-diameter double-line parallel pipe jacking construction project in Hangzhou,the software Plaxis 2D was used to conduct two-dimensional finite element analysis on ground settlement induced by double-line pipe jacking construction.The rationality of parameter selection was verified by comparing the calculation results of left-line pipe jacking construction with the field-measure data.On this basis,the influence of grouting pressure and preceding pipe jacking on ground disturbance was further analyzed.The results show that the silty sand layer in the area where pipe jacking crosses is reinforced by Metro Jet System(MJS)method,and the soil properties are further strengthened.The soil adjacent to the excavated tunnel can fully exert its bearing capacity.The stability of the soil around the pipe can be guaranteed by applying only small grouting pressure.It is recommended to control the grouting pressure no less than 0.8 times of pipe top water pressure or 0.4 times of pipe top soil pressure.The soil around the pipe is disturbed by the preceding pipe jacking and the disturbance increases ground settlement with the close distance of subsequent pipe jacking.Its influence can be simulated by weakening the soil around the pipe jacking.The double-line parallel pipe jacking project can appropriately increase the grouting pressure of the thixotropic mud to reduce ground settlement for the subsequent pipe jacking.

关 键 词：双线顶管 地表沉降 沉降槽 注浆压力 数值模拟 施工扰动 

分 类 号：U45[建筑科学—桥梁与隧道工程]