摘要
以蓉遵高速元厚出口上行边坡为研究对象,探讨贵州丹霞地貌区软硬互层公路边坡的变形过程与破坏机理。该边坡为红层软硬互层公路边坡,不等厚巨厚层砂岩与薄层泥岩相间分布,共可概化为15层。边坡坡表处软岩风化严重并有宽大裂隙及凹岩腔产生,从坡顶处时有碎石滑落堆积于坡底。论文采用底摩擦模型试验分析方法,对该工程边坡从边坡开挖到砂泥岩差异风化凹岩腔的扩展条件下边坡的变形、破坏发展演变过程及其特征展开研究。试验结果表明:天然边坡开挖时,对边坡整体影响不大,层面整体处于压密状态;边坡开挖过后的风化过程中,无节理时随着凹岩腔加深,砂岩层的破坏模式以坠落式为主,有节理时节理对边坡的变形破坏起到一定的推进作用;随着凹岩腔加深,临坡表处砂岩会从预加的节理裂隙处发生倾倒式的破坏。
The deformation process and failure mechanism of soft and hard interlayer slope in danxia landform area of Guizhou Province are studied based on the upward climbing slope close to Yuanhou Exit of Chengdu-Zunyi Expressway,where featured with red layer of soft and hard interbedded slope,with varied thick sandstone and thin mudstone interbedded,which can be generalized into 15 layers.On the surface of the slope,there are serious weathering of soft rock and wide cracks and concave rock cavity.In this paper,the bottom friction model test analysis method is used to study the slope deformation,failure development and evolution process and characteristics of the slope under the conditions of slope excavation to the expansion of sand mudstone differential weathering concave rock cavity.The test results show that the natural slope excavation has minor influence on the whole slope and the whole layer is in compact state.In the weathering process after slope excavation,when there is no joint,as the concave cavity deepens,the failure mode of sandstone layer is mainly falling.When there are joints,the joints play a certain role in promoting the deformation and failure of the slope.With the deepening of the concave cavity,the sandstone on the slope surface will have toppling failure from the pre-added joints and cracks.
作者
姬同旭
杨根兰
吴维义
董岩
覃乙根
JI Tong-xu;YANG Gen-lan;WU Wei-yi;DONG Yan;QIN Yi-Gen(Guizhou Transportation Planning Survey&Design Academe Co.Ltd.,Guiyang 550081,China;College of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,China)
出处
《公路》
北大核心
2020年第4期23-28,共6页
Highway
基金
贵州省交通运输厅科技项目,项目编号2016-123-029
贵州省科技平台及人才团队计划项目,黔科合平台人才[2017]5402号。
关键词
公路边坡
底摩擦试验
软硬互层
差异风化
road slope
bottom friction test
hard and soft interlayer
differential weathering
