不同黄土地区场地自重湿陷量评价的地区修正系数β_(0)取值研究  

Study on the Value of Regional Correction Coefficient of Site Gravity Subsidence Evaluation in Different Loess Areas

作　　者：王胤添 蔡晓成 曹景洲 WANG Yintian;CAI Xiaocheng;CAO Jingzhou(State Grid Gansu Provincial Electric Power Company Qingyang Power Supply Company,Qingyang Gansu 745000,China)

机构地区：[1]国网甘肃省电力公司庆阳供电公司,甘肃庆阳745000

出　　处：《工程质量》2024年第10期18-25,共8页Construction Quality

摘　　要：为了不同黄土地区场地自重湿陷量评价的地区修正系数β_(0)精确取值,论文收集了54处原位浸水试验资料,分析β_(0)取值及地区土质影响。结果表明:基于室内试验的自重湿陷量计算值与浸水试验实测值差异源自应力条件、入渗条件、地层结构、黄土结构性与湿陷性、尺寸效应影响;β0随单位厚度湿陷量增加而增大,各工程地质分区二者关系近似分布在同一趋势线上;建议Ⅰ、Ⅱ、Ⅲ、Ⅳ区β_(0)可分别取2.0、1.2、1.0、0.5,其中Ⅰ区取值可靠度高,Ⅱ、Ⅳ仍需积累更多浸水试验实例进行验证,Ⅲ区数据离散,按经验取值需慎重;各地区β_(0)随深度变化明显,场地湿陷性评价应对应土质入渗特征、湿陷特征,对湿陷系数阈值、β_(0)数值进行分区、分深度规定。In order to accurately evaluate the regional correction coefficients for the evaluation of site self-weight subsidence in different loess areas,the data of 54 in-situ immersion tests were collected to analyze the values and regional soil quality effects.The results show that the difference between the calculated value of self-weight collapsibility based on laboratory test and the measured value of immersion test is due to the influence of stress conditions,infiltration conditions,formation structure,loess structure and collapsibility,and size effect.With the increase of the unit thickness of the collapsibility,the relationship between the two areas is approximately distributed in the same trend line.It is suggested that the values ofⅠ,Ⅱ,ⅢandⅣcan be 2.0,1.2,1.0 and 0.5 respectively,of which the values ofⅠare highly reliable,and more examples of immersion tests ofⅡandⅣare still needed to be accumulated for verification.The data ofⅢare discrete,and the values should be carefully calculated according to experience.Each region varies significantly with depth.The evaluation of site collapsibility should be based on soil infiltration characteristics and collapsibility characteristics,and the threshold and value of collapsibility coefficient should be specified by zoning and depth.

关 键 词：黄土地区 自重湿陷量 浸水试验 地区修正系数β_(0) 

分 类 号：TU444[建筑科学—岩土工程]