软土地区嵌岩连续墙与非嵌岩连续墙支护性状对比分析

发布时间：2018-01-18 13:01

本文关键词：软土地区嵌岩连续墙与非嵌岩连续墙支护性状对比分析　出处：《岩石力学与工程学报》2014年01期 　论文类型：期刊论文

【摘要】：随着城市地下空间的不断开发,大型深基坑的开挖问题也随之出现,嵌岩连续墙由于端部处于强度较高的岩层中,其支护性状不同于连续墙端部处于土层时。通过对嵌岩连续墙和非嵌岩连续墙的侧向位移、竖向位移、支撑轴力等监测资料的对比分析发现,嵌岩部分连续墙的最大侧向位移小于非嵌岩部分连续墙的最大侧向位移,最大位移分别为0.20%He和0.32%He,其中,He为开挖深度。随着连续墙系统刚度的提高,墙身侧向位移呈减小的趋势,嵌岩部分连续墙最大侧向位移的减小幅度小于非嵌岩部分侧向位移的减小幅度。连续墙后土体的沉降呈先增大后减小的趋势,x/He2.0时(主影响区域),土体沉降较大,x/He2.0时(次影响区域),土体沉降较小。非嵌岩连续墙在第一道混凝土支撑和第四道钢支撑上的支撑轴力要远大于嵌岩连续墙,且支撑轴力总和比非嵌岩连续墙的大44.9%。
[Abstract]:With the continuous development of urban underground space, the excavation problem of large deep foundation pit also appears, and the rock-socketed continuous wall is in the high strength rock layer because of the end. The supporting behavior is different from that in the soil layer at the end of the continuous wall. Through the comparative analysis of the monitoring data such as lateral displacement vertical displacement and supporting axial force of the rock-socketed continuous wall and non-rock-socketed continuous wall. The maximum lateral displacement of the rock-socketed partial continuous wall is smaller than that of the non-rock-embedded partial continuous wall, and the maximum displacement is 0.20He and 0.32he. He is the excavation depth. With the increase of the stiffness of the continuous wall system, the lateral displacement of the wall body tends to decrease. The decrease of maximum lateral displacement of rock-socketed partial continuous wall is smaller than that of non-rock-embedded part of lateral displacement. The settlement of soil after continuous wall increases first and then decreases. When x / r he 2.0 (main area of influence), soil settlement is larger than x / r he 2.0 (sub-influence area). The axial force of non-rock-socketed continuous wall on the first concrete bracing and 4th steel bracing is much larger than that of rock-socketed continuous wall, and the total axial force of the supporting wall is 44.9% larger than that of the non-rock-socketed continuous wall.
【作者单位】：浙江大学滨海与城市岩土工程研究中心;浙江大学软弱土与环境土工教育部重点实验室;
【基金】：国家自然科学基金资助项目(51078377)
【分类号】：TU473.1
【正文快照】： 1引言随着城市建设规模以及地下空间开发规模的不断扩大,对于基坑开挖过程中基坑支护性状的研究越来越多,基坑的设计方法也完全转向变形设计,该设计方法对开挖过程中深基坑变形特性的认识提出了更高的要求。赵占广等[1-3]从施工工序方面着手,采用不同的数值方法对基坑开挖进行

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