摘要
在基岩埋深较浅或倾角大时,为了保证基坑稳定,地下连续墙要入岩。入岩方法有嵌岩式和支腿式,前者抗剪强度大,后者具有防水好、施工成本低、时间短、施工工艺成熟等优点,但其支腿受力特点尚未明确。采用理论分析发现支腿式地下连续墙承受弯、扭、剪、压等几种综合作用产生变形,然后针对某工程进行数值模拟和现场监测分析,比较不同尺寸下支腿变形与破坏模式,得到支腿最佳宽度为1m;研究不同岩层倾角对支腿受力影响,发现倾角超过20°时,支腿式地下连续墙破坏。
In order to ensure the stability of foundation excavation, diaphragm walls often enter the basic shallow buried rock or big angle rock. There are two methods to be used to realize the goal, that is rock- socketed and outrigger diaphragm. The rock-socketed diaphragm has the characteristics with anti-shear, high construction cost and long construction time. The outrigger diaphragm has the characteristics with better waterproof, low construction cost and short construction time and mature construction technology But its mechanical characteristic can＇ t yet be explicit. In the paper, the outrigger diaphragm was analyzed through theory analysis with the action of curve, twist, shear, pressure. At the same time, its different width was analyzed through numerical simulation and site monitoring. It is found that the best width is one meter. The influence of dip angle of basic rock to the outriggers was analyzed. And it is found that the outrigger was easily destroyed as the angle beyond twenty degree.
出处
《施工技术》
CAS
北大核心
2014年第1期41-44,共4页
Construction Technology
基金
国家自然科学基金项目(51078377)
浙江省科技厅项目(2012C21074)
浙江省交通厅项目(2012H66)
浙江工业大学自然基金项目(2011XY024)
关键词
地下工程
地下连续墙
数值分析
监测
underground
diaphragm walls
numerical analysis
monitoring
