Analysis of ground improvement of a highway in the soft clay ground
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摘要: 由于软土地基具有低强度、高压缩性等特征，规范规定在软土地基上建造高速公路时必须进行沉降变形监测。通过对某段路基填筑过程与预压期沉降情况分析，路基填筑期和预压期的沉降监测数据表明该段路基沉降量和沉降速率均大，且沉降速率收敛慢，这与地质资料中显示有较厚的软弱土层基本相应；在填筑期，路基快速填筑，产生沉降变形大，已经基本体现了路基后期沉降变形情况；设计方案中采用了超载预压基本合理，路基在预压期表现为沉降量大，虽然说明预压效果很好，但本段沉降速率过大，收敛速度慢，需要较长时间才能达到最终预压效果，这与地质勘察发现的 淤泥质粉质黏土为中高压缩性土并不吻合，因此 需要根据实际沉降观测数据进行具体分析。Abstract: It is necessary to monitor the settlement during construction of highways in the soft clay ground because of its characteristics of high compressibility and low strength. The settlement data during the time of filling and surcharge correspond with the geological data of the thick soft soil. They show that the plan of surcharge is necessary, and the effectiveness of the surcharge is obvious. The data also show both the large soil deformation and the high settlement velocity. Slow convergence have negtive effect on the actual surcharge, and it will lead to large settlement at late stage, which is not corresponding to that of the silty clay with middle to high compressibilities. Therefore, other plans are put forward to meet the control requirements.
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Keywords:
- soft ground /
- settlement /
- surcharge /
- effectiveness /
- data analysis
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[1] 江苏省镇江 814 勘察测绘有限公司 . 泰州大桥接线镇江段工程地质勘察报告 [R]. 江苏省镇江 814 勘察测绘有限公司 , 2008. ( Jiangsu Province Zhenjiang No.814 Survey Mapping Co., Ltd. G eological survey report of Zhenjiang route from Taizhou Bridge[R] . Zhenjiang: Jiangsu Province Zhenjiang No.814 Survey Mapping Co., Ltd., 2008 . (in Chinese)) [2] 江苏省交通规划设计院 . 泰州大桥接线镇江段设计文件 [R]. 南京 : 江苏省交通规划设计院 , 2008. (Traffic Planning and Design Institute of Jiangsu Province. Zhenjiang, Design documents of Zhenjiang route from Taizhou Bridge[R] . Nanjing: Traffic Planning and Design Institute of Jiangsu Province, 2008 . (in Chinese)) [3] JTG D30 — 2004 公路路基设计规范 [S] . 北京 : 人民交通出版社 , 2004. ( JTG D30 — 2004 roadbed design specifications[S] . Beijing : China Communications Press, 2004 . (in Chinese))
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