植被覆盖下膨胀土长期强度特性分析  

The Long-term Strength Characteristic of Expansive Soil Under the Vegetation Action

作　　者：刘正明 曹建忠 李雄威[2] 王爱军[2] 

机构地区：[1]江苏省地矿局第二地质大队,江苏常州213300 [2]常州工学院土木建筑工程学院,江苏常州213002

出　　处：《常州工学院学报》2015年第5期1-5,共5页Journal of Changzhou Institute of Technology

基　　金：江苏省地质矿产局科研项目(2014-KY-4);江苏省科学技术厅基础研究计划(自然科学基金)面上研究项目(BK20131141);江苏省高校"青蓝工程"项目

摘　　要：对放置于自然环境中7个月的有、无植被覆盖膨胀土试样,在20 cm深度范围内各分4层取样进行饱和直剪试验,植被覆盖下表层土体平均强度指标为c=11.76 k Pa,φ=9.49°,无植被覆盖下为c=3.06 k Pa,φ=5.68°。与原状土样(c=17.11 k Pa,φ=17.17°)对比发现,大气作用下有、无植被覆盖膨胀土强度都有所衰减,但无植被覆盖的衰减幅度较大,植被作用可有效降低膨胀土强度的衰减幅度。Expansive soil with or without vegetation was placed in natural environment for seven months. Soil samples at four layers were taken respectively from 20 cm depth range of shallowsoil,and saturated direct shear tests were carried out. The results showthat for expansive soil with vegetation,the average strength indexes of surface soil are c = 11. 76 k Pa and φ = 9. 49°; for expansive soil without vegetation,the average strength indexes are c = 3. 06 k Pa and φ = 5. 68°; But for undisturbed expansive soil,the strength indexes are c = 17. 11 k Pa and φ = 17. 17°. By comparison,it can be found that the atmospheric action has attenuation on expansive soil strength with or without vegetation,but for expansive soil without vegetation,attenuation amplitude of strength are bigger. The role of vegetation can effectively reduce the strength of expansive soil attenuation.

关 键 词：膨胀土 植被 长期强度 大气作用 

分 类 号：TU443[建筑科学—岩土工程]