板连式斜直组合微型桩加固边坡工作性状数值分析  

Numerical analysis of working properties of slope reinforced by inclined-straight composite micropiles

作　　者：曾锦秀 ZENG Jinxiu(School of Civil Engineering,Fujian Chuanzheng Communications College,Fuzhou,350007,China;Collaborative Innovation Center for Application Technology of“Transportation Civil Engineering Intelligence and green construction”,Fujian Provincial,Fujian Chuanzheng Communications College,Fuzhou,350007,China)

机构地区：[1]福建船政交通职业学院土木工程学院,福建福州350007 [2]福建船政交通职业学院福建省“交通土建智能与绿色建造”应用技术协同创新中心,福建福州350007

出　　处：《华北科技学院学报》2023年第2期84-90,共7页Journal of North China Institute of Science and Technology

基　　金：福建省中青年教师教育科研项目(JAT210702);2022年度福建船政交通职业学院校级科教发展基金项目博士科研启动专项(20220108);2018年福建省交通运输科技项目(201830);福建省教育厅应用技术协同创新中心项目(闽教科[2018]105号)。

摘　　要：为对斜直组合微型桩加固边坡中微型桩的工作性状进行研究,采用FLAC 3D数值模拟软件对斜直组合微型桩进行三维数值模拟,研究斜桩倾角对组合结构的力学响应及其对边坡加固效果的影响。结果表明:在相同条件下,随着桩身倾角的增大,桩身变形及桩身水平位移呈现先增大后减小再增大的变化趋势。当桩身倾角为10°和20°时,桩身变形(水平位移)分别达到最大值和最小值。同时,各桩桩身水平位移最大值出现的位置(距桩顶的距离)随着桩身倾角的增大而逐渐增大。总体而言,随着桩身倾角的增大,边坡潜在滑面由浅变深。不同桩身倾角组合结构加固下边坡的塑性区分布范围不同,当桩身倾角为20°时,发生剪切破坏的塑性区单元分布范围较小。为较好发挥斜直微型桩组合结构加固边坡效果,建议将组合结构中前排与后排的桩身倾角设置为15°~20°为宜。In order to study the working behavior of micro-piles in slope reinforced by inclined-straight composite micro-piles,FLAC 3D numerical simulation software is used to simulate the three-dimensional numerical simulation of inclined-straight composite micro-piles to study the mechanical response of inclined pile angle to composite structure and its effect on slope reinforcement.The results show that:under the same conditions,with the increase of the inclination angle of the pile,the deformation and horizontal displacement of the pile first increase and then decrease and then increase.When the inclination angle of pile is 10°and 20°,the deformation(horizontal displacement)of pile reaches the maximum and minimum respectively.At the same time,the position of the maximum horizontal displacement of each pile(the distance from the top of the pile)increases with the increase of the inclination angle of the pile.In general,with the increase of pile inclination,the potential sliding surface of the slope becomes deeper.The distribution range of the plastic zone of the slope reinforced by the composite structure with different pile inclination angles is different.When the pile inclination angle is 20°,the distribution range of the plastic zone unit with shear failure is small.In order to give full play to the slope reinforcement effect of the inclined straight micro pile composite structure,it is suggested that the inclination angle of the front and back piles in the composite structure should be set to 15°~20°.

关 键 词：斜直组合 微型桩 边坡 数值分析 

分 类 号：O319.56[理学—一般力学与力学基础]