边坡抗滑桩设计计算的三维有限元法  

3D FINITE ELEMENT METHOD FOR DESIGN COMPUTATIONS OF ANTI-SLIDE PILES

作　　者：戴自航[1] 徐祥[1] 

机构地区：[1]福州大学岩土工程研究所,福建福州350108

出　　处：《岩石力学与工程学报》2012年第12期2572-2578,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：福建省自然科学基金资助项目(2011J01308)

摘　　要：结合福建省龙岩市公路局长汀分局机修班边坡地质灾害防治工程,首先利用ABAQUS有限元软件中的反算法,获得该边坡土体的抗剪强度指标;其次,在超级计算机上建立不同抗滑桩设桩方案下的大型真三维有限元模型,采用有限元强度折减法,得到土质边坡加固安全系数与抗滑桩的桩长、桩径和桩距之间的关系,以及桩身截面弯矩沿桩长的分布规律;同时揭示边坡抗滑桩桩周土压力的分布规律,表明由于桩拱效应的影响,设置在边坡中的抗滑桩桩周土压力的分布与设置在水平地层中且桩顶承受水平荷载的桩的土压力分布不同;最后,在对大量试算方案综合比较的基础上,确定该边坡抗滑桩的最优设计方案。该方法可为大中型边(滑)坡抗滑桩的设计提供参考。Combining the slope geological hazard control engineering in the repairman group living community of Changting branch of Highway Administration Bureau of Longyan city,Fujian province,firstly,the shear strength indices of the slope soil are obtained through back analysis by using ABAQUS program.Secondly,a lot of real large-scale three-dimensional（3D） finite element models in different design cases of anti-slide piles are established in supercomputer.Then,the relationships between the safety factors of soil slopes and pile lengths,as well as pile diameters,pile spacing,are obtained by using 3D strength reduction FEM.And the bending moment diagrams of the piles are also obtained.Meanwhile,the distribution laws of earth pressure surrounding the anti-slide piles are revealed.It is illustrated that because of the existence of soil arching effect,there are differences between earth pressure surrounding the anti-slide piles and that with laterally crown loading piles located in horizontal strata.At last,based on comprehensive comparison of a large number of test computation cases,the optimal design case of anti-slide piles is obtained.The method can be for references in the design of anti-slides piles for large and medium scale slopes（landslides）.

关 键 词：边坡工程 抗滑桩 反算法 三维有限元强度折减法 安全系数 

分 类 号：P642[天文地球—工程地质学]