强夯置换碎石墩技术在高铁漂石路基中的应用

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摘要东北某高速铁路经过敦化盆地的西部丘陵区,局部地形起伏较小。该强夯置换处理的工程段含有松软土分布,主要为第四系冲积层软塑状粉质黏土及第四系上更新统软塑状粉质黏土,厚约0.4～9.6 m,该层土物理力学性质较差,对工程有影响。且该路基原位处理深度内含有不规则漂石分布,粒径间于0.2～2 m,漂石含量约占15%～20%,钻孔岩芯统计漂石约占岩芯9.4%。采用钻孔桩技术的难度在与漂石的大体积与硬度反射容易造成钻孔偏位,损伤钻头与机具,经济上的可行性较低。本文采用强夯置换碎石墩技术来处理该寒区铁路路基,通过试验、监测与地基承载力试验综合验证该方法的可行性,并最终将该技术成功用于整个含漂石路段。

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	马明磊
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	宋合财
	杜佐龙

关键词 ：漂石, 高速铁路, 强夯, 碎石墩, 钻孔桩

Abstract：The construction of city-connected high-speed railway in Northeast China has confronted a difficult problem in improving the bearing capacity of soft soils. The construction interval is in a small basin. The thickness of the silty clay is from 0.4 m to 9.6 m. There exists irregular size of erratic stones, the diameter of the stone is from 0.2 m to 2 m. The volume fraction of the stone is around 15%～20%. The drilling tool is prone to be broken when the bit meets silty clay, and the pile hole is easy to be inclined. It is technically poor and the economic feasibility is low. This problem is solved by applying the dynamic compaction replacement technology in reinforcing the stone subgrade of high-speed railway. By using the improved technology, a steady subgrade and economic benefits are achieved.

Key words： stone high-speed railway dynamic compaction stone pier bored pile

收稿日期: 2013-07-17

TU472.3

作者简介: 马明磊(1983- )，男，河南安阳人，博士，从事工程力学方面研究工作。E-mail: mingleima@gmail.com。

引用本文:

马明磊, 王桂玲, 王永宏, 王文涛, 宋合财, 杜佐龙. 强夯置换碎石墩技术在高铁漂石路基中的应用[J]. 岩土工程学报, 2013, 35(zk2): 879-883. MA Ming-lei, WANG Gui-ling, WANG Yong-hong, WANG Wen-tao, SONG He-cai, DU Zuo-long. Application dynamic compaction replacement technology in reinforcing stone subgrade of high-speed railway. Chinese J. Geot. Eng., 2013, 35(zk2): 879-883.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2013/V35/Izk2/879

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