提高盾构隧道进出洞端头土体加固质量的技术研究  

Technical study on improving the quality of soil reinforcement at the entrance and exit ends of shield tunnels

作　　者：郭文学 惠海鹏 陈芋如 顾金涛 姜维 黄钰程 GUO Wen-xue;HUI Hai-peng;CHEN Yu-ru;GU Jin-tao;JIANG Wei;HUANG Yu-cheng(No.8 Engineering Co.,Ltd.of CCCC First Highway Engineering Co.,Ltd.,Tianjin 300170,China;Soochow University,Suzhou,Jiangsu 215141,China)

机构地区：[1]中交一公局第八工程有限公司,天津300170 [2]苏州大学,江苏苏州215141

出　　处：《中国港湾建设》2022年第7期6-10,22,共6页China Harbour Engineering

基　　金：江苏省自然科学基金(BK20210720);江苏省高等学校自然科学研究面上项目(19KJ11580018);江苏省建设系统科技项目(2021ZD02);国家自然科学基金项目(52078317);江苏省自然科学基金(优秀青年基金项目)(BK20211597);江苏省地质矿产勘查局科技项目(2021KY06);苏州市建设系统科研项目(2021-25);中交隧道工程局有限公司科技项目(8gs-2021-04)。

摘　　要：三轴搅拌桩施工技术能够有效固结软土从而提高地基强度。以苏州市轨道交通8号线裕新路站为例,对施工设备的选择、施工工艺和方法进行研究,从而解决富水软弱地层三轴搅拌桩的质量控制问题,降低盾构施工带来的风险。利用颗粒流离散元软件模拟盾构进出洞端头土体的变形过程,并对洞口土体的应力变化以及顶部土体沉降进行分析。结果表明:随着时间的推移,端头土体最终形成圆弧剪切带,滑移半径约为0.77 m;洞口土体接触应力呈减小趋势;土体顶部出现明显的沉降槽,沉降随时间呈非线性增长,最终的沉降量达到25.20 mm。The construction technology of triaxial mixing pile can effectively consolidate the soft soil and improve the foundation strength.Yuxin Road station of Suzhou rail transit Line 8 was taken as an example to study the selection of construction equipment,construction technology and methods,so as to solve the quality control problem of triaxial mixing pile in water-rich and weak stratum and reduce the risk brought by shield construction.The particle flow discrete element software was used to simulate the deformation process of the soil at shield ends,and the stress change of the soil at the entrance and the settlement of the soil at the top of the tunnel were analyzed.The results show that with the passage of time,the soil at the end eventually forms an arc shear zone with a slip radius about 0.77 m.The soil contact stress at the mouth of shield tunnel decreases.There is an obvious settlement trough at the top of the soil,and the settlement increases nonlinearly with time,and the final settlement reaches 25.20 mm.

关 键 词：盾构隧道 端头土体 三轴搅拌桩 颗粒流离散元 沉降分析 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程] U455.43[交通运输工程—船舶与海洋工程]