生石灰桩挤密地基过程的弹性解答  

An Elasticity Solution of Quicklime Pile Compacts Ground

作　　者：米海珍[1] 胡燕妮[1] 高春[1] 

机构地区：[1]兰州理工大学土木工程学院,兰州730050

出　　处：《建筑科学》2011年第3期38-40,44,共4页Building Science

基　　金：甘肃省自然科学基金项目(3ZSO42-B25-031)

摘　　要：用生石灰桩挤密地基时,考虑了生石灰的膨胀与地基压力变化的相互作用,用弹性理论求解该耦合问题,首次得到了桩孔内壁位移ur与生石灰膨胀压力p之间的数学关系:ur=(1+μ)d2p/(4Er);利用试验得到的生石灰膨胀特性探讨了生石灰桩对地基的挤密效果,同时求得生石灰体积膨胀系数η随地基深度z的变化规律:η=Aln(Korz)+B,该计算公式的提出较之以前的经验取值更为准确、可靠。用实例计算分析表明生石灰挤密桩对地基深度超过13m时效果极其有限,这为该种地基处理法的合理使用给出了理论根据。Concerning the mutual action of the quicklime expansion and change of ground pressure when quicklime pile compacts ground,the authors employ elastic theory to solve the coupling problem,and for the first time obtain the mathematical relation between the pile hole inner-wall displacement ur and the quicklime expansion pressure p： ur =（1 ＋ μ） d2 p /（4Er）.In this paper the authors use the quicklime expansion characteristics resulting from laboratory test to explore the ground-compaction effect the quicklime exerts on ground,show the relationship between the quicklime volume expansion coefficient η and the ground depth z：η = Aln（Korz） ＋ B.This calculation formula produces more accurate and reliable results than before.Through a calculation example it is indicated that when the depth of ground is deeper than 13m,the compact effect of the quicklime is insignificant.This conclusion provides theory evidence for the appropriate use of this method in ground treatment.

关 键 词：生石灰 膨胀量 地基处理 生石灰桩挤密法 

分 类 号：TU443[建筑科学—岩土工程]