贵州软土地基中旁压试验的应用及成果分析  

Application and Analysis of Pressuremeter Test on Soft Soil in Guizhou Province

作　　者：杨期祥[1] 巫锡勇 廖昕[1] 张金行[1] 刘观龙 王森[1] 

机构地区：[1]西南交通大学地质工程系,成都市610031

出　　处：《公路》2016年第2期34-40,共7页Highway

基　　金：国家自然科学基金资助项目;项目编号41172261

摘　　要：介绍了PY-5型旁压仪的构造及基本原理。应用旁压仪在贵州某山地型软土地基完成了旁压试验,得到相应的承载力及变形参数。并结合现场实际地质情况,分析旁压曲线特征规律所受土层性质、稠度、深度、成孔条件等诸多因素的影响。将试验得到的地基承载力及压缩模量与现场静力触探试验、室内土工试验以及铁路规范取值做了对比分析,验证了旁压试验成果在贵州软土地基设计使用时的适用性。结果表明,旁压试验对于测定土体压缩模量这一指标更为可靠,测定土体地基承载力时要根据地区经验乘以相应的修正系数。The PY 5pressuremeter is described in terms of its basic structure and operating principle, which is applied to the in-suit test in soft soil foundation in Guizhou Province. The bearing capacity and deformation parameters are obtained by pressuremeter curve. Based on the analysis to actual geological conditions, the pressuremeter curve features regulations are analyzed from the affecting factors of soil properties, consistency state, depth, pore forming conditions, et al. In order to verify the application of the pressuremeter test for foundation design in Guizhou soft soil, comparisons are made with static cone penetration test, consolidation test, and specification values for bearing capacity and compression modulus. The results show that the pressuremeter test own relatively high reliability to reflect the soil strength and deformation properties, especially the index of compression modulus, and the index of bearing capacity should be multiplied by a correction coefficient according to the native experience statistics.

关 键 词：旁压试验 软土 承载力 静力触探 压缩模量 

分 类 号：U416.1[交通运输工程—道路与铁道工程]