摘要
我国城市化建设不断发展,出现了大量覆盖土+下覆风化岩的二元结构边坡,但对于此类结构边坡的整体稳定性分析及支护设计理论体系方面研究较少。为此,以济南地区蒋山山体加固项目为研究对象,在分析现场施工条件、边坡高度及周边环境的基础上,提出了桩板式挡墙+预应力锚索+岩石锚喷的组合结构工程设计,成功地解决了济南地区土岩组合边坡土体易失稳、支挡结构变形较大和施工过程安全性差等支护难题。同时结合MIDAS/GTS有限元软件,对既有边坡的稳定性进行了分析,并从应力场、位移场及整体稳定性系数3个方面研究了土岩二元结构边坡滑移面位置及破坏机理。研究结果表明:既有边坡整体稳定性系数为1.22,属于基本稳定状态;随着施工工况进行,下覆灰岩薄弱面发生应力集中现象,边坡潜在滑移面的工程规模则随着加固措施的进行得到了有效的抑制;坡顶及坡脚位置处位移逐渐减小,而最大位移量位于边坡中部的土岩交界面附近,位移值14.64mm;通过边坡加固设计方案,土岩二元结构边坡整体稳定性系数提高至1.55,属于稳定状态,达到了规范要求。
With the continuous development of urbanization in China,there are a large number of binary structure slopes with overburden soil and weathered rock,but there are few studies on the overall stability analysis and support design theory system of such structure slopes.Therefore,taking Jiangshan mountain reinforcement project in Jinan area as the research object,based on the analysis of site construction conditions,slope height and surrounding environment,the composite structure engineering design of pile plate retaining wall+prestressed anchor cable+rock bolt shotcreting was put forward,which successfully solves the problems of soil instability,large deformation of retaining structure and poor safety in construction process of soil rock composite slope in Jinan area.At the same time,combined with the finite element software MIDAS/GTS,the stability of the existing slope was analyzed,and the sliding surface position and failure mechanism of the soil rock binary structure slope were studied from three aspects of stress field,displacement field and overall stability coefficient.The research results show that the overall stability coefficient of the existing slope is 1.22,which belongs to the basic stable state;with the construction conditions,the stress concentration occurs on the weak surface of the underlying limestone,and the engineering scale of the potential slip surface of the slope is effectively restrained with the reinforcement measures;the displacement at the top and foot of the slope gradually decreases,and the maximum displacement is located in the middle of the slope,the displacement value is 14.64mm near the interface;through the slope reinforcement design scheme,the overall stability coefficient of the soil rock binary structure slope is increased to 1.55,which belongs to the stable state and meets the specification requirements.
作者
何昭宇
王冬明
张太国
范世英
HE Zhaoyu;WANG Dongming;ZHANG Taiguo;FAN Shiying(Shandong Jiankan Group Co.,Ltd.,Jinan 250031,China;Jinan Municipal Engineering Design and Research Institute(Group)Co.,Ltd.,Jinan 250000,China)
出处
《建筑结构》
北大核心
2024年第4期73-79,66,共8页
Building Structure
基金
山东省住房城乡建设科技计划项目(2018-K5-04、2020-K1-1)。
关键词
土岩二元结构
加固设计
安全系数
整体稳定性
数值模拟
soil rock binary structure
reinforcement design
safety factor
overall stability
numerical simulation
