原位测试基床系数探讨  

Discussion on in-situ test of subgrade reaction coefficient

作　　者：肖鸿斌 Xiao Hongbin(Shanghai Urban Construction Design and Research Institute Group Co.,Ltd.,Shanghai 200125,China)

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《工程勘察》2022年第9期25-32,共8页Geotechnical Investigation & Surveying

摘　　要：实际工程中采用原位测试获取的基床系数差异较大,原位测试的应用受限。为对基床系数研究提供帮助,收集杭州地区多条地铁的原位测试包括深层螺旋板试验、扁铲试验及旁压试验数据,在最新规范框架前提下提出均按基础尺寸和土性进行双修正的方法。双修正后按土性进行分类比对,各试验同类基床系数(基准值)之间表现出较好的收敛性,也为经验值取值提供借鉴。原位测试时基床系数总体处于弹性变形阶段,水平系数(基准值)与弹性特征的压缩模量E_(s_(0.1-0.2))表现出较好的相关性,经统计给出粘性土系数与压缩模量E_(s_(0.1-0.2))比值的换算公式。Due to the subgrade reaction coefficient obtained by in-situ test is quite various in practice,the application of in-situ test is limited.In order to study of the coefficient,the in-situ test data of several subways in Hangzhou including deep spire plate load test,flat dilatometer test and pressuremeter test are collected.Based on the latest standards,the method of correction according to the foundation size and soil properties is proposed.The comparison of the corrected results is carried out according to the category of soil properties.The coefficient of each category shows good convergence and the empirical values are obtained.During the in-situ test,the subgrade reaction coefficient is generally in the stage of elastic deformation,the coefficient(reference value)shows a good correlation with the compression modulus of elastic characteristics E_(s_(0.1-0.2)).Through statistical analysis the conversion formula of the ratio of cohesive soil horizontal coefficient to compression modulus is obtained.

关 键 词：原位测试 基床系数 修正 基准值 经验值 弹性变形与非弹性变形 压缩模量 

分 类 号：TU470[建筑科学—结构工程]