昆明地区砾砂复合地层土压平衡盾构渣土改良技术  

Soil Conditioning Technique of Earth Pressure Balance Shield of Kunming Gravel and Sand Composite Stratum

作　　者：宋上明 李志军 陈先智 刘晨 刘正日 SONG Shangming;LI Zhijun;CHEN Xianzhi;LIU Chen;LIU Zhengri(China Railway Development Investment Group Co.,Ltd.,Kunming,Yunnan 650118,China;Urban Rail Transit Engineering Branch of China Railway Fifth Bureau Group Co.,Ltd.,Changsha,Hu'nan 410205,China;School of Civil Engineering,Central South University,Changsha,Hu'nan 410075,China)

机构地区：[1]中铁开发投资集团有限公司,云南昆明650118 [2]中铁五局集团有限公司城市轨道交通工程分公司,湖南长沙410205 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《施工技术》2019年第10期112-116,共5页Construction Technology

基　　金：国家自然科学基金(51778637)

摘　　要：以昆明地铁4号线苏小盾构井-小菜园站盾构区间为工程依托,采用现场测试与室内试验相结合的方式探究土压平衡盾构穿越砾砂复合地层渣土改良技术。根据现场坍落度试验结果分析当前渣土状态,通过欠改良渣土二次改良试验及液、塑限试验得到使渣土流动性良好的改良参数。研究结果表明,昆明地区砾砂复合地层渣土较佳坍落度为13~18cm,每环泡沫原液用量20L,注水量8m^3,通过采用优化后的改良参数,掘进参数数值合理,改良效果显著。Based on the construction of the shield section of Suxiao shield structure and the Xiaocaiyuan Station of Kunming Subway line 4,the combination of on-site tracking test and laboratory test is used to explore the soil conditioning technology of earth pressure balance shield crossing the gravel sand composite formation soil.According to the results of the on-site slump test,the current improvement of the slag is analyzed.The improved parameters are obtained through the secondary improvement test and the liquid plastic limit test.The results show that the better slump of gravel-sand composite stratum in Kunming is about 13~18 cm,the amount of foaming liquid per tunnel is 20 L,the water injection range is8 m^3.By adopting the optimized parameters,the driving parameters are reasonable and the improvement effect is remarkable.

关 键 词：地铁 盾构 渣土改良 优化 掘进参数 试验 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]