高压旋喷桩加固船闸边坡数值研究  

Numerical study of slope reinforced by high-pressure jet grouting pile

作　　者：严利娥[1,2,3] 易念平 汪海蕾[1] 张信贵 陈天愿 YAN Li-e;YI Nian-ping;WANG Hai-lei;ZHANG Xin-gui;CHEN Tian-yuan(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Mitigation and Engineering Safety of Guangxi,Nanning 530004,China;Xiamen Municipal Construction Development Corporation,Xiamen 3610043,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]广西防灾减灾与工程安全重点实验室,广西南宁530004 [4]厦门市市政建设开发总公司,厦门3610043

出　　处：《广西大学学报（自然科学版）》2018年第4期1537-1546,共10页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51168005;51268003);广西防灾减灾与工程安全重点实验室开放课题项目(2012ZDK08;2015ZDK001);广西重点实验室系统性研究项目(2013ZDX11);广西大学优秀博士研究生出国项目;南宁市科学研究与技术开发计划(科技攻关)南科发字[2013]46号

摘　　要：高压旋喷桩在软弱地基处理以及基坑加固工程中应用广泛,但较少应用于边坡加固,目前对高压旋喷桩加固边坡的变形破坏特性和抗滑机理认识不清,相应的稳定性评价理论研究较少。选取某船闸工程高压旋喷桩加固边坡典型断面,考虑桩土相互作用,基于强度折减法,用有限元软件ABAQUS建立边坡三维数值计算模型,探究高压旋喷桩在边坡加固中的变形破坏机理。结果表明:采用高压旋喷桩加固边坡提高了边坡的稳定安全系数,桩体发生的是剪切破坏;加固边坡破坏特性为形成贯通的剪切滑动带而非滑动面;增加高压旋喷桩在滑床以下的嵌入深度以及加大桩体到坡面的长度并不能有效提高边坡的稳定性。运用"等效桩条法"将加固边坡三维数值模拟问题转化为二维平面应变问题,进行加固边坡的二维数值模拟。结果表明:边坡的二维数值模拟滑裂面与三维模拟结果一致,采用全长桩与10 m的埋入式桩时,得到的稳定安全系数相比三维数值模拟结果分别大5.5%和3%,而二维数值建模方便快捷,可节省大量数值运算时间,其结果可工程设计提供有效的参考。High-pressure jet grouting piles are widely used in soft ground treatment and reinforcement of foundation pit.However,it is seldom used in slope reinforcement.Currently,deformation and failure features and anti-sliding mechanism of high-pressure jet grouting piles for slope reinforcement are still unclear and the corresponding theory is not available.Considering the interaction between piles and soil,using ABAQUS combined with the strength reduction method,the typical 3D slope model based on a dock project is established to study the failure mechanism of high-pressure jet grouting piles in the reinforced slope.The results show that the safe coefficient of the slope can be significantly improved by using high-pressure jet grouting piles;the failure mode of the piles is shear failure;a shear slip band rather than a slip surface appears when the reinforced slope fails;the stability of the slope cannot be improved effectively by increasing the embedding depth of the piles under the glide bedding or lengthening the piles out to the slope surface.Using the equivalent strip method,the three-dimensional model of the reinforced slope is converted into a two-dimensional plane-strain model in ABAQUS.The results show that the deformation and failure features of the 2D simulation are the same as the 3Ds.In the cases of full-length piles and embedded piles with the fixed length of 10m,safety coefficients from the 2D numerical study are slightly 5.5%and 3%larger,respectively.In addition,with the results from the 2D analyses,the time of numerical simulation can be shortened and general guidance and suggestions are also provided for designers in similar projects.

关 键 词：有限元模拟 强度折减法 边坡稳定性 高压旋喷桩 

分 类 号：TU472.5[建筑科学—结构工程]