复杂应力下强风化软岩湿化变形试验研究  

EXPERIMENTAL STUDY ON SLAKING DEFORMATION OF INTENSE WEATHERING SOFT ROCK UNDER COMPLICATED STRESS CONDITIONS

作　　者：刘新喜[1] 夏元友[1] 刘祖德[2] 陈向阳[3] 宁齐元[4] 

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]武汉大学土木建筑工程学院,湖北武汉430072 [3]湖南城市学院土木工程学院,湖南益阳413000 [4]湖南理工职业技术学院,湖南湘潭411100

出　　处：《岩石力学与工程学报》2006年第5期925-930,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：教育部新世纪优秀人才支持计划(NECT040723);教育部科学技术研究重点项目(104135);湖北省青年杰出人才基金项目(2005ABB022)

摘　　要：强风化软岩用于高等级公路路基填筑时,压实特性和湿化变形特性是评价填料性能的主要指标。对填料在不同压实度下进行承载比试验,试验结果表明,承载比值随填料压实度的增大而增大。利用室内三轴剪切仪对强风化软岩进行干、湿双线平行试验和在复杂应力状态下不同压实度的湿化变形试验,试验结果表明,填料在压实度为90%且有较大的偏应作用下,湿化不仅产生较大的附加轴向应变,而且还能引起相当大的附加体积应变和偏应变。因此,提高路基填土的压实度是减少湿化变形的关键因素。When using intense weathering soft rock to fill high grade highway embankment, compaction characters and wetting deformation characters are the major indices to estimate the filling performance. The CBR experiments under different compaction degrees showed that the CBR value increased with the filling compaction degree increase. Triaxial shear apparatus was used to conduct dry-wet double-line parallel experiment and wetting deformation experiment of different compactions under complicated stress conditions. The result shows when the compaction degree reaches to 90% with rather high deviatoric stress, wetting can not only generate high additional axial deformation, but also cause high additional volumetric strain and deviatoric deformation. Increasing compaction degree of the filling is the key factor to decrease wetting deformation.

关 键 词：岩石力学 复杂应力 强风化软岩 湿化变形 压实度 

分 类 号：TU45[建筑科学—岩土工程]