高压旋喷桩加固地基在南京越江隧道风井工程中的应用  

Application of high pressure jet grouting technology in ventilation shaft project of Nanjing tunnel across the Yangtze River

作　　者：张祥龙[1,2] 黄传青[2] 张伟 Zhang Xianglong;Huang Chuanqing;Zhang Wei(Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan 250061;Dean's Office,Shandong TV University,Jinan 250014;China Railway 10Bureau Group Co.Ltd,Jinan 250032)

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061 [2]山东广播电视大学教务处,济南250014 [3]中铁十局集团有限公司,济南250032

出　　处：《工程建设》2018年第12期41-45,共5页Engineering Construction

摘　　要：为确保南京过江通道工程深达62. 45 m的地下连续墙成槽施工的顺利进行,及解决盾构机顺利穿过梅子洲风井的难题,在梅子洲风井周边采用高压喷射注浆技术对长江漫滩区富水场地进行地基处理,充分利用高压旋喷射流作用切割掺搅地层,同时灌入水泥浆使其与原土层形成凝结体,改变原地层的结构和组成,达到加固地基和防渗止水的目的。工程利用高压喷射注浆技术处理地基后,旋喷桩连成一体起到较好地加固挡水作用,并保证超深地连墙施工时成槽顺利;盾构穿越风井时围护结构的整体收敛变形和变形速率控制在规范允许范围内。实践证明,高压喷射注浆技术在多种土层交错分布高承压水的环境下加固处理地基是可行的。In order to ensure the smooth trenching construction of the 62.45m deep diaphragm wall and successful crossing of Meizizhou ventilation shaft by the shield machine for the project of Nanjing channel crossing the river,the foundation treatment is carried out for Yangtze river flood plain rich-water site around the Meizizhou ventilation shaft by using the high-pressure injection grouting technique.The high-pressure jet injection flow is fully used to cut the strata,and the cement slurry is grouted in,forming concrete with the original soil layer,changing the structure and composition of the original stratum and attaning the purpose of foundation reinforcement and water seepage prevention.After using the high pressure jet grouting technique for foundation treatment,the jet grouting piles are integrated and have good reinforcement and water retaining functions,and it is ensured that the extra deep diaphragm wall is trenched successfully;when the shield passes through the ventilation shaft,the overall contraction deformation and deformation speed of the enclosure structure are controlled within allowable range.The practice shows that,the high pressure jet grouting technology is feasible for foundation reinforcement under the environment of cross distribution of multiple soil layer and high pressure water.

关 键 词：长江漫滩 深基坑 高压喷射注浆 风井 

分 类 号：U453.5[建筑科学—桥梁与隧道工程] TU753.3[交通运输工程—道路与铁道工程]