膨胀法处理湿陷性黄土地基的理论及试验  

Theoretical Analysis and Testing of Ground Treatment Using an Expansive Method in Very Thick Collapsible Loess

作　　者：何永强[1,2] 朱彦鹏[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]西北民族大学土木工程学院,甘肃兰州730030

出　　处：《土木建筑与环境工程》2009年第1期44-48,共5页Journal of Civil,Architectural & Environment Engineering

基　　金：教育部春晖计划资助项目(Z2004-1-62011);甘肃省科技公关资助项目(ZS011-50-013-G);甘肃省自然科学基金(Z5032-B25-002)

摘　　要：通过对湿陷性黄土地区地基处理技术的研究,提出了利用生石灰桩膨胀材料处理湿陷性黄土地基的方法。首先阐述了膨胀法处理地基的基本原理。其次利用圆柱形孔扩张理论推导了在处理大厚度湿陷性黄土地基时,生石灰桩膨胀材料使用量的计算方法。最后,将该方法用于工程实践,通过土工试验测试处理后地基土的物理力学性质指标。试验结果表明,用该方法处理后的湿陷性黄土地基,湿陷性完全被消除,各项物理力学指标得到显著改善,土的压缩性及压缩模量均得到提高,体现了该计算理论的正确性,进一步证明了膨胀法在大厚度湿陷性黄土地基处理中的可行性。Through technological research of foundation treatments in the collapsible loess areas, we recommend a method of treating foundations in collapsible loess with quicklime piles. We set forth the basic principle of this expansive method. When a very thick foundation in collapsible loess is treated, the computational formula for the volume of expanding material in a quicklime pile is deduced based on cavity expansion theory. This theory is applied to engineering practice. Physical and mechanical properties of the compacted soil are tested. The result shows that the collapsibility of a foundation in loess has been eliminated, its physico-mechanical indexes have been improved, and the soil compressibility and the modulus of compressibility also increase remarkably, demonstrating the correctness of the computation theory. The feasibility of the expansive method for very thick collapsible loess areas is further established.

关 键 词：圆孔扩张理论 生石灰桩 大厚度 湿陷性黄土 地基处理 

分 类 号：TU472.32[建筑科学—结构工程]