爆炸法加固砂土地基与软黏土地基对比分析  

Comparative analysis of treatment of sand foundation and soft clay foundation by explosion method

作　　者：江文豪 詹良通[1] JIANG Wen-hao;ZHAN Liang-tong(Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310058

出　　处：《地基处理》2020年第2期126-136,共11页Journal of Ground Improvement

基　　金：浙江省重点研发计划项目(No.2019C03107)。

摘　　要：在国外爆炸法加固砂土地基是一种常用的地基处理方式,而在国内有学者采用爆炸法对深厚软黏土地基进行了加固处理。相比于爆炸法加固砂土地基,有关爆炸法加固软黏土地基的作用机理和适用范围仍处于探索阶段。本文主要对比分析了爆炸法加固砂土地基和软黏土地基的作用机理、设计参数、施工工艺及效果评价四个方面。对比分析表明,无论是爆炸法加固砂基还是软基,挤密作用和排水固结作用均是两种地基加固的重要机理,但两种地基中超孔隙水压力的产生机理存在差异:爆炸作用下砂基中超孔压的产生机理包括压密、剪缩作用,而软基中超孔压的产生机理主要在于压密作用。为精确描述爆炸法加固地基的效果,本文提出了“单位质量炸药产生沉降体积(简称SVPU)”的概念。爆炸作用下砂基的SVPU值大多处于500~1300 cm^3/g,而软基的SVPU值则处于250~700 cm^3/g,根据SVPU值进行判断,爆炸作用下软基的加固效果仅为砂基一半。基于对比分析结果,对爆炸法加固软黏土地基的适用性进行了讨论,并指出了还需进一步研究的几个方面。Explosive Compaction(EC)of sand foundation is a common method of foundation treatment abroad,and some scholars in China have adopted explosion method to reinforce deep soft clay foundation as well.However,compared with sand foundation by EC,there are few engineering cases of soft clay foundation treatment by explosion method.At present,the mechanisms and scope of application for explosive treatment of soft clay foundation are still in the exploration stage.This paper compares and analyses the mechanism,design parameters,construction technology,and effect evaluation of explosive treatment for sand and soft clay foundation.The comparative analysis shows that compaction and drainage consolidation are important for both sand foundation and soft clay foundation,but there are differences in the mechanism of excess pore water pressure between the two kinds of foundations.It is concluded that the excess pore water pressure in sand foundation under explosion results in both compaction and shearing action,while primarily causing compaction in soft foundation.To accurately illustrate the effect of explosive reinforcement,this paper proposes the concept of“settling volume produced by explosive per unit mass(SVPU)”.The SVPU value of sand foundation under explosion is mostly in the range of 500-1300 cm^3/g,while the SVPU value of soft foundation is between 250 and 700 cm^3/g.According to the SVPU values,the reinforcement effect of soft foundation under explosion is only half of that of sand foundation.Based on the results of comparative analysis,the paper discusses the applicability of explosive method to reinforce soft clay foundation,and points out several aspects that need further study.

关 键 词：爆炸法 砂土地基 软黏土地基 作用机理 效果评价 

分 类 号：TU443[建筑科学—岩土工程]