岩溶塌陷影响下加筋路基承载机理研究

发布时间：2018-03-04 10:15

本文选题：岩溶塌陷　切入点：加筋路基　出处：《长江科学院院报》2017年02期 　论文类型：期刊论文

【摘要】：在可能发生岩溶塌陷的地区建造路堤,可采用在路堤底部铺设土工合成材料加筋垫层的方法加固路基,防止岩溶突然坍塌造成路堤塌陷。采用PLAXIS3D软件,运用更新网格的大变形有限元分析方法,研究加筋路基在岩溶塌陷影响下路堤和筋材位移、应力场分布规律及加筋路基的承载机理,分析了岩溶塌陷尺寸、路堤填土高度、筋材抗拉刚度和路堤填土性质对地表最大沉降和最大拉力的影响。结果表明,地表最大沉降与路堤中是否形成封闭的应力穹顶密切相关,封闭的应力穹顶高度主要受塌陷尺寸和路堤填土黏聚力影响;筋材抗拉刚度、路堤高度和路堤填土内摩擦角对封闭的应力穹顶高度影响较小;筋材横纵向最大拉力按筋材横纵向抗拉刚度比例分配,单向与双向加筋差别不大。
[Abstract]:May occur in the karst collapse area can be used to build the embankment laying method of geosynthetic reinforced embankment in subgrade bottom reinforcement, prevent karst collapse caused by embankment collapse. By using PLAXIS3D software, used to update the grid large deformation finite element analysis method of reinforced subgrade under embankment reinforcement and displacement under the influence of karst collapse, the bearing mechanism of the stress field distribution and reinforced subgrade, analyzes the size of karst collapse, the height of embankment fill, affect the tensile stiffness of Geosynthetic and embankment settlement on the surface properties of the maximum and maximum force. The results show that whether the closed stress dome is closely related to the formation and the maximum surface settlement of embankment, closed the stress is mainly affected by the size and height of the dome collapse embankment cohesion; geogrid tensile rigidity, embankment height of embankment and internal friction angle on the closed stress high dome The maximum tensile force of the transverse longitudinal reinforcement of the steel bar is distributed according to the proportion of the longitudinal tensile stiffness of the steel bar, and there is little difference between the one-way and the two-way reinforcement.

【作者单位】：武汉大学土木建筑工程学院;福州大学土木工程学院;
【基金】：国家自然科学基金项目(41572253) 高等学校博士学科点专项科研基金博导类资助课题项目(20133514110004)
【分类号】：U416.1

【参考文献】