地裂缝带路基土的压缩特性及防治对策  

Compression Characteristic and Control Measure of Subgrade Soil in Ground Fissure Zone

作　　者：卢全中[1,2] 吴辉龙 彭建兵[1,2] 胡鹏[1] 刘阳[1] 

机构地区：[1]长安大学地质工程系,陕西西安710054 [2]长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054

出　　处：《中国公路学报》2015年第7期10-17,共8页China Journal of Highway and Transport

基　　金：国家重点基础研究发展计划("九七三"计划)项目(2014CB744702);国家自然科学基金项目(41130753;41272284);国土资源大调查项目(12120113004900);陕西省科技统筹创新工程计划项目(2011KTZB03-02-02)

摘　　要：通过侧限压缩和三轴压缩试验以及野外调查，分析了裂隙和含水率对裂缝带土压缩性质的影响，总结了地裂缝带路面的4种变形破坏形式，提出了公路地裂缝灾害的避绕、适应和减缓等综合防治措施。试验结果表明：侧限压缩条件下，裂缝带土在0～50kPa和大于200kPa时的压缩性明显大于非裂缝带土；三轴压缩条件下，裂缝带土中裂隙的变形方式有压缩变形、剪切变形、纵向拉张变形、横向拉张变形和旋转变形5种，裂隙的局部变形特征决定了裂缝带土的整体变形方式；同一裂缝带土的强度随着含水率的增大而降低。By means of confined compression test, triaxial compression test and field investigation, the compression characteristics influenced by the fissure and moisture content of soil samples were analyzed, 4 deformation and failure types of pavement in ground fissure zone were summarized, and such measures of preventing road hazards as avoidance, adaptation and mitigation were also proposed. The results show that the compressibility of fissured soil samples at the pressure of 0-50 kPa and 〉200 kPa under confined compression condition is significantly greater than that of undisturbed samples, and under triaxial compression condition, there are 5 different fissure deformation modes of compression deformation, shear deformation, longitudinal tensile deformation, lateral tensile deformation and rotation, which determine the overall deformation of fissured samples. The strength of the same type of sample is reduced with the increase of moisture content of soil.

关 键 词：道路工程 地裂缝带 压缩试验 路基土 防治 路面变形破坏 

分 类 号：U416.1[交通运输工程—道路与铁道工程]