| 地铁拱顶衬砌上方土体中的隐患的探查 |
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| 引用本文： | 钟世航,刘传新,范鹏举,王荣,王泽峰.地铁拱顶衬砌上方土体中的隐患的探查[J].岩土力学,2014,35(Z2):690-694. |
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| 作者姓名： | 钟世航 刘传新 范鹏举 王荣 王泽峰 |
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| 作者单位： | 1.中国铁道科学研究院，北京 100081；2.江苏省交通科学研究院股份有限公司，南京 210017 ；3.北京水工资环新技术开发有限公司，北京 100044 |
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| 基金项目： | 国家重点基础研究发展计划(973)（No. 2013CB036002）。 |
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| 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—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2 m左右的空区,上方土体已发生松动。在南京4号线某段沿隧道拱顶顶正上方的一条剖面上50m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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| 关 键 词： | 地铁 拱顶衬砌 陆地声纳 空洞 土体松动区 |
| 收稿时间： | 2014-04-04 |
Surveying hidden dangers in soil above vault lining of metro |
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| ZHONG Shi-hang,LIU Chuan-xin,FAN peng-ju,WANG Rong,WANG Ze-feng.Surveying hidden dangers in soil above vault lining of metro[J].Rock and Soil Mechanics,2014,35(Z2):690-694. |
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| Authors: | ZHONG Shi-hang LIU Chuan-xin FAN peng-ju WANG Rong WANG Ze-feng |
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| Institution: | 1.China Academy of Railway Sciences, Beijing 100081, China; 2.Jiangsu Transportation Institute, Co., Ltd., Nanjing 210017, China; 3.Beijing H.E.M.E New-Tech Development Co., Ltd., Beijing 100044, China |
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| Abstract: | The caves not tamped back of vault lining of the excavated metro would destroy the soil layer above the metro tunnel, which can develop to ground and became the big dangerous to the traffic and buildings. The prediction aquifers and interface between rock and soil is important thing to construction safety in excavating subway tunnel. The landsonar method has been used to solve those problems and got good feedback. Three caves of 2 m long were found in the Landsonar time-section of 60 m long survey lines in metro line-6 in Tongzhou, Beijing, which cross with Jing-Ha railway under ground surface of 21 m depth . The left and right survey lines are along the median of subway tunnels, surrounding rock of which are alluvial land and miscellaneous fill soil. On the Landsonar time-section of 50 m long survey line along the median of subway tunnel of Line-4 subway of Nanjing, it can be found that 9 caves and looseness region whose depth were around 8 m, which lead the soil body above them to loosen, and five developed to the asphalt pavement. There was another survey line with a collapse. From the Landsonar time-section, it can be seen that the collapse only developed to the clay layer of 4m depth, but the looseness already developed to the asphalt pavement. |
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| Keywords: | metro vault lining landsonar caves looseness region of soil |
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