【摘 要】
：
地铁开挖和衬砌之后衬砌背后的空区和因其未填实而导致土层破坏,破坏产生的土体松散甚至发展到地面,是影响地面交通和建筑物安全的重大隐患.地铁开挖时,掌子面前方的岩土分界线、含水层的预报,是保证施工安全的重要工作.笔者采用陆地声纳法进行探查工作,取得了直观的效果.在北京通州地铁6号线穿过京哈(北京一哈尔滨)铁路下方的剖面和沿隧道拱顶正上方设置的长60 m的剖面上,可以看到有3处长2m左右的空区,上方土体
【机 构】
：
中国铁道科学研究院,北京100081;北京水工资环新技术开发有限公司,北京100044 江苏省交通
【出 处】
：
中国建筑学会地基基础分会2014年学术会议
论文部分内容阅读
地铁开挖和衬砌之后衬砌背后的空区和因其未填实而导致土层破坏,破坏产生的土体松散甚至发展到地面,是影响地面交通和建筑物安全的重大隐患.地铁开挖时,掌子面前方的岩土分界线、含水层的预报,是保证施工安全的重要工作.笔者采用陆地声纳法进行探查工作,取得了直观的效果.在北京通州地铁6号线穿过京哈(北京一哈尔滨)铁路下方的剖面和沿隧道拱顶正上方设置的长60 m的剖面上,可以看到有3处长2m左右的空区,上方土体己发生松动.在南京4号线某段沿隧道拱顶顶正上方的一条剖面上50 m长度内就发现了9处衬砌背后空区及土体松动区,都诱发了上方土体的松动,松动埋深为8m,其中有5处土体松动已达到沥青路面下.开挖时出现坍方的一段剖面,虽然坍体仅达地面下约4m的黏土层,但坍体旁的土体已松动达到沥青路面之下.
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