复杂砂砾地层中矩形顶管施工地下空洞成因分析  

Cause analysis of underground cavities in rectangular pipe jacking construction in the complex gravel stratum

作　　者：罗为东 刘勇 王树人 Luo Weidong;Liu Yong;Wang Shuren(Nanjing Decoration Industry Development Centre,Nanjing 210000,China;Nanjing Municipal Engineering Quality and Safety Supervision Station,Nanjing 210036,China;Nanjing Tongli Construction Group Co.,Ltd.,Nanjing 210046,China)

机构地区：[1]南京市装饰行业发展中心,江苏南京210000 [2]南京市市政工程质量安全监督站,江苏南京210036 [3]南京同力建设集团股份有限公司,江苏南京210046

出　　处：《山西建筑》2022年第24期96-100,共5页Shanxi Architecture

摘　　要：包头市某矩形顶管工程位于复杂砂砾地层中,顶管施工过程中地下出现大量空洞。为了准确找出空洞形成的原因,采取了一套科学严谨的分析方法。先通过对现场空洞以及顶管施工参数的调查,找出“土压力显示异常”与“顶进动力过大”这两个主要问题。在此基础上,绘制原因分析关联图找出8条末端因素,并逐条进行要因确认。最终,找出了地下空洞形成的主因:土压表被砂石堵塞、减摩泥浆在土体中流失以及改良泥浆配合比不适用。A rectangular pipe jacking project in Baotou is located in the complex gravel stratum.During the pipe jacking construction,there are a lot of holes under the ground.In order to find out the reasons for the formation of the hole,we have adopted a set of scientific and rigorous analytical methods.First,through the investigation of the construction site parameters and the construction parameters of the jacking pipe,we find out the 2 main problems of“abnormal earth pressure display”and“excessive jacking force”.On this basis,we draw the cause analysis association diagram to find out 8 terminal factors,and confirm the cause by item.Finally,the main reason for the formation of the underground cavity is found out:the earth pressure gauge is blocked by sand and gravel,the mud is lost in the soil and the mixing ratio of the improved mud is not applicable.

关 键 词：复杂砂砾地层 矩形顶管 空洞成因 

分 类 号：TU992.05[建筑科学—市政工程]