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作为一种新型围护结构形式,带支腿地下连续墙已经开始在深基坑工程中应用,但目前国内外在这个方面的研究还比较匮乏。在杭州黄龙饭店改扩建工程中,由于部分围护结构插入深度不能满足设计要求,设计中采用带支腿地下连续墙成功地解决了整幅地下连续墙不能进入中风化基岩层问题,保证了围护结构的嵌岩深度,降低了施工难度,取得了良好的社会效益和经济效益。针对该基坑工程实例,利用有限元分析软件ABAQUS,建立了单片带支腿地下连续墙作为围护结构的准三维有限元分析模型。在数值模拟中,土体采用修正剑桥模型,模拟实际开挖工况,将基坑开挖中墙体侧向位移的数值计算结果和监测数据进行了对比,分析了带支腿地下连续墙的围护效果和支腿中内插型钢的合理刚度问题。
As a new type of enclosure structure, the continuous diaphragm wall with legs has begun to be used in deep foundation pit engineering. However, there are still few studies in this area at home and abroad. In the project of Huanglong Hotel in Hangzhou, due to the depth of some enclosing structures can not meet the design requirements, the continuous diaphragm wall with outrigger was adopted in the design to successfully solve the problem that the whole underground diaphragm wall can not enter the bedrock of the weathered bedrock, The depth of embedded rock retaining structure reduces the difficulty of construction and achieved good social and economic benefits. According to the engineering example of the foundation pit, the finite element analysis software ABAQUS was used to establish a quasi-three-dimensional finite element analysis model of a single piece of continuous diaphragm wall with outrigger as envelope. In the numerical simulation, the soil model is calibrated with Cambridge model to simulate the actual excavation conditions. The numerical results of the lateral displacement of the excavation in the foundation pit are compared with the monitoring data. The effects of the continuous diaphragm wall with legs Envelope Effect and Reasonable Stiffness of Insert Steel in Leg.