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针对青岛地区典型桩锚支护结构型式的土岩组合基坑,通过有限元模拟,对土层厚度、锚杆布设、支护桩嵌入岩层的相对深度、岩层组成及开挖方式等不同条件下基坑开挖引起的地表沉降特征进行了计算分析,在基坑地表沉降模式、灌注桩的嵌岩比、基坑开挖影响范围、地表沉降与桩体水平位移的关系等方面得到了一些定性和定量的基本规律,可为类似基坑工程的设计开挖提供借鉴。
Aiming at the earth-rock composite foundation pit with the typical type of pile-anchor supporting structure in Qingdao area, the finite element simulation is used to analyze the influence of different parameters such as the thickness of the soil layer, the layout of the anchor rod, the relative depth of the embedded support layer of the support pile, The ground settlement characteristics caused by the excavation of the foundation pit are calculated and analyzed. Some qualitative characteristics are obtained in the surface settlement mode of the foundation pit, the rock-fill ratio of the cast-in-situ piles, the influence range of the foundation pit excavation, the relationship between the ground settlement and the horizontal displacement of the pile body And quantitative basic rules, which can provide reference for the design and excavation of similar foundation pit engineering.