声波透射法在旋喷桩复合地基加固效果评价中的应用  

Application of Sonic Wave Penetrating Method to Strengthening Effect Assessment of Churning Pile Composite Foundation

作　　者：贺玉龙[1] 杨立中[1] 郑永翔[1] 

机构地区：[1]西南交通大学地质工程系,四川成都610031

出　　处：《中国铁道科学》2003年第5期44-47,共4页China Railway Science

摘　　要：结合襄渝线某段地基加固效果检测实例,介绍声波透射法在旋喷桩复合地基加固效果评价中的应用。提出天然地基加固后旋喷桩体和复合地基波速的最低限值:对旋喷桩体,波速最低限值为1600m·s-1;对复合地基,波速最低限值为1100m·s-1。若加固后旋喷桩体和复合地基的波速均达到上述最低限值,则旋喷桩体的无侧限抗压强度一般可达2MPa～8MPa,复合地基承载力可达250kPa～400kPa。实践表明,声波透射法操作简便、快捷,对现场测试条件要求不高,便于重复测试,而且对测试对象无破坏作用。利用声波透射法的测试结果可以定性评价旋喷桩体和复合地基的均匀性以及相对强度特征。In combination with the actual test of the strengthening effect of the section foundation in XiangfanChongqing railway, the paper introduces the application of sonic wave penetrating method to the strengthening effect assessment of the churning pile composite foundation. In combination with the integrated test results of the chemical churning pile composite foundation on other sections, the paper put forwards the lowest limit of the chemical churning pile and composite foundation acoustic velocity. The velocity for chemical churning pile and composite foundation are respectively 1 600 m·s-1 and 1 100 m·s-1. If the lowest limit of the acoustic velocity lives up to the above value, the unconfined compressive strength of chemical churning pile will reach 2 MPa-8 MPa and the loadbearing capacity of the composite foundation will reach 250 kPa-400 kPa. Engineering practice shows that the sonic wave penetration method is simple, convenient, nondestructive and repeatable. The test results of the sonic wave penetration method can be used to qualitatively assess the homogeneity and relative intensity. 

关 键 词：声波透射法 旋喷桩 复合地基 地基加固 效果评价 

分 类 号：TU473.16[建筑科学—结构工程]