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为分析基坑支护结构在不确定性因素影响下的优化设计,针对土层参数大、小样本信息采用响应面法对基坑支护结构进行可靠度优化分析。由于土层参数c、φ间存在一定的互相关性,因此在优化分析中考虑了互相关性的影响;并采用响应面法对原设计及确定性优化设计进行了风险分析。结果表明,小样本条件下,是否考虑互相关性时,其优化结果与原设计相比,每延米土钉总长度可减少20.97%~32.58%;大样本条件下,是否考虑互相关性时,其优化结果与原设计相比:每延米土钉总长度可减少20.97%~35.01%;大、小样本条件下,考虑互相关性时比不考虑时每延米土钉总长度减少15.24%~17.76%,优化效果明显。
In order to analyze the optimal design of the foundation pit supporting structure under the influence of uncertain factors, the reliability analysis of the foundation pit supporting structure is carried out by response surface method according to the large and small sample information. Due to the existence of some cross-correlation between soil parameters c and φ, the influence of cross-correlation is taken into account in optimization analysis. The response surface method is used to analyze the risk of original design and deterministic optimization design. The results show that the total length of soil nails per meter can be reduced by 20.97% ~ 32.58% compared with the original design when the cross-correlation is considered under small sample conditions. When the cross-correlation is considered under large sample conditions , The optimized results are compared with the original design. The total length of soil nails per meter can be reduced by 20.97% ~ 35.01%. When the cross-correlation is considered, the total length of soil nails decreases by 15.24 % ~ 17.76%, the optimization effect is obvious.