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在城区对深基坑进行支护时,因地质和施工条件复杂,单一支护方式往往难以满足基坑的变形与稳定性要求。单支点桩锚土钉联合支护结构作为一种复合优势明显的组合支护方式,可有效控制基坑变形、减少施工难度。但目前该方法的设计理论尚未成熟,限制了其工程应用推广。利用工程类比法,基于前人研究的土压力分配模型,结合规范及相关研究理论将其运用于云南某深基坑支护设计中,分别就桩锚结构及土钉结构部分进行了设计计算,并根据规范要求对其进行了安全性验算,确定了该方法的适用性及此设计思路的可行性。
When supporting deep foundation pit in urban area, due to the complex geological conditions and construction conditions, the single support method is often difficult to meet the deformation and stability requirements of foundation pit. As a kind of combined support with obvious composite superiority, the single support pile-soil-nail joint support structure can effectively control the deformation of foundation pit and reduce the construction difficulty. However, the design theory of this method is not yet mature, which limits the promotion of its engineering application. The engineering analogy method, the earth pressure distribution model based on the predecessor’s research, and the normative and relevant research theories are applied to the design of a deep foundation pit in Yunnan. The pile-anchor structure and soil nailing structure are designed and calculated respectively. According to the requirements of the specification, the safety checkout is carried out to confirm the applicability of the method and the feasibility of the design method.