基于桩间土滑动特性的合理桩间距研究  

Rational Spacing between Anti-slide Piles Based on Sliding Characteristic of Soil between Piles

作　　者：任永忠 朱彦鹏[2,3] REN Yongzhong;ZHU Yanpeng(College of Civil Engineering, Lanzhou Institute of Technology, Lanzhou 730050, Gansu, China;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology, Lanzhou 730050, Gansu, China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)

机构地区：[1]兰州工业学院土木工程学院,甘肃兰州730050 [2]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [3]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《地震工程学报》2020年第6期1590-1597,共8页China Earthquake Engineering Journal

基　　金：甘肃省陇原青年创新创业人才(团队)项目(2020RCXM196);甘肃省高等学校创新能力提升项目(2019B-180);兰州工业学院“启智”人才培养计划基金(2019QZ-05);兰州工业学院校级岩土工程重点学科(2019XK-04)。

摘　　要：为研究抗滑桩合理桩间距以及荷载传递机制,首先以桩侧摩阻力为拱脚时的破裂面推导出以桩身为拱脚时的破裂角计算公式;然后引入对数螺旋线法确定桩间土体的滑移深度,以土拱效应为基础建立计算模型,求解考虑桩间土体滑移深度的合理桩间距表达式;最后对桩间净距的主要影响因素进行分析,包括滑坡推力、黏聚力、桩截面宽度以及高度。研究结果表明:由桩身和桩侧摩阻力同时作为土拱拱脚更符合实际受力状态,同时求得的土拱拱圈厚度和矢高小于以桩身为拱脚条件下相应值而大于以桩侧摩阻力为拱脚条件下的相应值,并且随桩埋深的增加而增大。The reasonable spacing between anti-slide piles and the load transfer mechanism was investigated in this study.First,the calculation formula of the rupture angle with the skewback of a soil arch supported by a pile body was deduced from the fracture surface with the skewback supported by the side friction.Second,the logarithmic spiral method was introduced to determine the slip depth of soil between piles.The calculation model was established based on the soil arching effect to solve the expression of reasonable spacing between anti-slide piles considering the slip depth of the soil between piles.Finally,the major influencing factors of the net spacing between anti-slide piles were analyzed,including the landslide thrust,the cohesion,and the width and height of the anti-slide pile section.The results showed that the skewback of the soil arch supported by the pile body and pile side friction was more in line with the actual stress state;moreover,under this condition,the ring thickness and vector height of soil arch,which increased with the pile depth,were less than those of the soil arch supported by the pile body but more than those of the soil arch supported by the pile side friction.

关 键 词：抗滑桩 桩间距 土拱效应 土拱拱脚 影响因素 

分 类 号：TU473.1[建筑科学—结构工程]