CPT试验在检测黄土浸水中的应用  

Application of CPT Test in the Detection of Loess Immersion

作　　者：李文强[1,2] 董立山 LI Wen-qiang;DONG Li-shan(State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection,Chengdu University of Technology,Chengdu 610059,China;Shanxi Transportation Planning Survey and Design Institute Co.Ltd.,Taiyuan 030032,China;Shanxi Transportation Holding Technology Transformation Co.Ltd.,Taiyuan 030001,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都市610059 [2]山西省交通规划勘察设计院有限公司,太原市030032 [3]山西交控科技转化有限公司,太原市030001

出　　处：《公路》2025年第1期144-147,共4页Highway

基　　金：山西省基础研究计划面上项目,项目编号202303021211252;山西交通控股集团科技项目,项目编号20-JKKJ-32。

摘　　要：为研究晋中盆地黄土路基浸水沉降机理,查明路基变形特性和沉降规律,选取昔榆高速一处湿陷性黄土路段进行现场浸水试验,并结合CPT试验,测试黄土湿陷性及浸水前后CPT曲线差异性,并在某意外漏水场地进行应用,判别浸水范围和深度。研究表明:浸水后CPT锥尖阻力较侧壁阻力下降明显;在水平和垂直渗透系数相当的情况下,现场浸水试验垂直入渗远远大于水平渗透;同一场地天然状态下黄土指标存在偏差性,浸水后将大大降低指标的差异性;CPT试验准确查明漏水场地的范围和影响深度,漏水区域在T16和T17附近,浸水深度约13~17.6 m。In order to study the mechanism of water immersion and settlement of loess subgrade in Jinzhong Basin and identify the deformation characteristics and settlement law of the subgrade,a collapsible loess section of Xi(Xiyang County)-Yu(Yuci District)Expressway is selected for on-site water immersion test,and combined with CPT test,the collapsibility of loess and the difference of CPT curve before and after water immersion are detected,and then applied in an accidental water leakage site to identify the scope and depth of water immersion.The results show that the tip resistance of CPT decreases significantly compared with the sidewall resistance after water immersion.Under the condition that the horizontal and vertical permeability coefficients are equal,the vertical infiltration is much larger than the horizontal infiltration in the field immersion test.The loess index of the same site has deviation in natural state,and the difference of index will be greatly reduced after water immersion.The CPT test can accurately identify the scope and depth of the water leakage site:the water leakage area is near T16 and T17,and the depth of water immersion is about 13~17.6 m.

关 键 词：湿陷性黄土 CPT 浸水试验 渗透系数 孔隙水压力 静力触探指标 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU444[建筑科学—岩土工程]