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为实现基坑止水结构形式设计选择的定量化,使其达到最优化设计,笔者通过分析侧向止水结构的类型及影响因素,运用权重分析法对侧向止水结构选择进行研究。结果表明:侧向止水结构类型多样,影响因素众多,在不同的地质条件、止水效果及造价等因素下,侧向止水结构的选择侧重也不同;当基坑开挖深度小于6.0m且渗透系数较小时,可优先选择钢板桩;开挖深度6.0～10.0m时可优先选择深层搅拌桩;当开挖深度在10.0～30.0m、含砾石的地层(渗透系数大)、施工过程中有净空限制或与刚性桩密贴时则优先选择高压旋喷桩;开挖深度超过30.0m时优先选择地下连续墙。
In order to quantify the design choice of foundation pit water stop structure and achieve the optimum design, the author analyzes the types and influencing factors of lateral stop structure, and uses the weight analysis method to study the selection of lateral stop structure. The results show that there are many types of lateral sealing structure and many influencing factors. Under different geological conditions, water stopping effect and cost, the lateral sealing structure has different emphases. When the excavation depth is less than 6.0m When the permeability coefficient is small, the steel sheet piles may be selected preferentially. When deep excavation depth is 6.0 ~ 10.0m, deep mixing piles may be selected preferentially. When the excavation depth is between 10.0 ~ 30.0m, gravel-bearing strata (large permeability coefficient) High-pressure rotary jet grouting piles are preferred when there is clearance limit or close to rigid piles. When the excavation depth exceeds 30.0m, the continuous diaphragm wall is preferred.