复合多层滑床条件下锚索抗滑桩受力特征研究  

Mechanical characteristics of anchored slide-resistant piles under the condition of composite multilayer sliding bed

作　　者：王贵华[1] 李长冬[1,2] 陈文强 熊爽[1] 于淼 张华伟 WANG Guihua;LI Changdong;CHEN Wenqiang;XIONG Shuang;YU Miao;ZHANG Huawei(Faculty of Engineering,China University of Geosciences(Wuhari),Wuhan,Hubei 430074,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology Chengdu,Sichuan 610059,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《岩石力学与工程学报》2019年第11期2219-2230,共12页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点研发计划(2017YFC1501304);成都理工大学地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2017K017)~~

摘　　要：目前,复杂滑坡中锚索抗滑桩的计算模型对实际地质条件考虑尚不够充分。鉴于此,基于桩–锚变形协调原理,构建了复合多层滑床条件下锚索抗滑桩计算分析模型。考虑滑坡的滑床为复合多层的情况,提出复合多层嵌固段抗滑桩内力和变形计算方法,并通过联立方程组求解出各排锚索拉力,进而得到锚索抗滑桩整个桩身内力和位移分布特征;完善了计算模型的控制条件,采用桩顶位移和桩身侧壁应力共同对改进的计算模型进行了合理性验证。基于MATLAB平台编写了改进算法的计算程序,将改进算法与传统算法应用于2个滑坡实例的计算中,并通过数值模拟与实际监测数据分别对实例1与实例2的计算结果进行对比分析。结果表明:改进算法相比传统算法准确性更高,且改进算法得到的桩身变形及内力均小于传统算法,桩顶位移减小比例分别为17.0%和28.7%,最大弯矩值减小比例分别为10.64%和20.90%,可见,传统算法的设计偏于保守,会导致工程造价偏高。研究方法可为复合多层滑床中锚索抗滑桩设计提供一定的理论依据与借鉴参考。Aiming at that the existing calculation model of anchored slide-resistant piles fails to fully consider the actual geological conditions,a calculation and analysis model of anchored slide-resistant piles under the condition of compound multilayer sliding bed was established based on the theory of deformation coordination.The tension forces of each row of cables can be solved by simultaneous equations,and then the distributions of the internal force and displacement of anti-slide piles are obtained.The control conditions of the calculation model were improved and the rationality of the improved calculation model was verified by the displacement of the pile top and the stress of the pile side.The computation program of the improvement method was written by MATLAB and two project cases were calculated by both improved and traditional algorithms.Comparisons between the calculation results of two cases by numerical simulation and practical monitoring data show that the improved algorithm is more accurate than the traditional algorithm and that both the deformation and the internal force of the pile calculated by the improved algorithm are smaller than those by the traditional algorithm.For two cases,to be specific,the displacements of the pile top decrease by 17.0%and 28.7%respectively and the maximum bending moments decrease by 10.64%and 20.90%respectively.It is indicated that the traditional method is conservative for design and hence results in a higher project cost.The proposed method can provide a theoretical basis and reference for the design of anchored slide-resistant piles in the area of composite multilayer rock mass.

关 键 词：桩基础 多层滑床 锚索抗滑桩 变形协调 内力计算 

分 类 号：TU473[建筑科学—结构工程]