蒙脱石含量和土体状态对膨胀土收缩特性的影响  

Influence of the Montmorillonite Content and Soil State on Shrinkage Characteristics of Expansive Soil

作　　者：吴珺华[1,2,3] 匡唐亮 叶云雪 赵贵涛 WU Junhua;KUANG Tangliang;YE Yunxue;ZHAO Guitao(School of Civil Engineering and Architecture,Nanchang Hangkong University,Nanchang 330063,China;Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam,Ministry of Water Resources,Nanjing 210024,China;Jiangxi Smart Building Engineering Research Center,Nanchang 330063,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]南昌航空大学土木建筑学院,南昌330063 [2]水利部土石坝破坏机理与防控技术重点实验室,南京210024 [3]江西省智慧建筑工程研究中心,南昌330063 [4]武汉大学土木建筑工程学院,武汉430072

出　　处：《工业建筑》2023年第5期144-149,共6页Industrial Construction

基　　金：国家自然科学基金项目(51869013);水利部土石坝破坏机理与防控技术重点实验室开放研究基金(YK321013);南昌航空大学博士启动基金项目(EA201911396)。

摘　　要：为研究不同含量蒙脱石和土体状态对膨胀土收缩特性的影响,采用能够反映土体状态的试样(泥浆样、预固结样和压实样)进行收缩特性试验。试验结果表明:随着蒙脱石含量的增大,泥浆样的收缩变形逐渐增大;预固结样在蒙脱石含量在某一范围时,收缩变形相差不大,随着蒙脱石含量的增大,预固结样会产生明显的收缩变形;对于泥浆样和预固结样,当蒙脱石含量超过一定值时,土体收缩特性曲线(SSCC)残余收缩段的曲率会不断减小;对比图解缩限,计算缩限更接近真实缩限,当SSCC为一条折线时,计算缩限与图解缩限相等;蒙脱石含量对膨胀土收缩特性的影响要大于土体状态。To study the influence of the different montmorillonite content and soil state on the shrinkage characteristics of expansive soil,shrinkage characteristic tests were conducted on specimens which the samples reflected soil state(in the slurry state,after i.e.,paste-like,pre-consolidation,and in compaction state).The test results indicated show that the proposed improved method can ensure consistency with the test results obtained by the conventional method for the soil shrinkage characteristic tests,and is convenient to operate and save time.as the montmorillonite content increased,the shrinkage deformation of the slurry specimens paste-like sample gradually increased,and as the montmorillonite content in pre-consolidated specimens was in a certain range,lower the differences of deformationd shrinkage deformation between specimens were not much,as the montmorillonite content increased to a certain amount,continued to increase,the pre-consolidated specimens would sample will produce obvious shrinkage deformation.For slurry specimens paste-like samples and pre-consolidated specimens,when the montmorillonite content exceeded a specific value,the curvature in the residual shrinkage stage of soil shrinkage characteristic curves(SSCC)would constantly continue to decrease.Comparing with the values of shrinkage limit obtained from the graphic method,the shrinkage limit resulted from calculated values was closer to the actual value.When the SSCC was a broken line,the calculated shrinkage limit equaled to the value by remains unchanged regardless of whether the graphic method.and calculated method is used.The influence of the montmorillonite content on the shrinkage characteristics of expansive soil was greater than that of the soil state.

关 键 词：膨胀土 蒙脱石含量 土体状态 收缩特性 缩限 

分 类 号：TU443[建筑科学—岩土工程]