基于响应面法的某粉质黏土深基坑土钉参数分析与优化  

Analysis and Optimization of Soil Nail Parameters in a Deep FoundationPit of Silty Clay Based on Response Surface Methodology

作　　者：樊成[1] 王子源 祁鹏飞 张宏斌 张条条 FAN Cheng;WANG Zi-yuan;QI Peng-fei;ZHANG Hong-bin;ZHANG Tiao-tiao(Research Center for Geotechnical and Structural Engineering Technology of Liaoning Province,Dalian University,Dalian 116622,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

机构地区：[1]大连大学岩土与结构工程技术辽宁省研究中心,辽宁大连116622 [2]中国地震局地球物理研究所,北京100081

出　　处：《长江科学院院报》2025年第4期142-148,158,共8页Journal of Changjiang River Scientific Research Institute

摘　　要：为揭示土钉设计中空间形态参数等因素对粉质黏土深基坑三维稳定性的影响规律,以河北某粉质黏土地区深基坑为工程背景,基于响应面法设计Plackett-Burman与Box-Behnken试验,采用MIDAS-GTS与Design-Expert软件建立试验模型。通过数值模拟与监测数据分析了各参数对粉质黏土深基坑土钉支护安全性的影响规律及优化方案的适用性。结果表明:各参数对粉质黏土地区基坑支护稳定性的影响程度从大到小依次为土钉长度、放坡坡角、土钉间距、土钉倾角、土钉直径。在支护参数的组合作用中,土钉长度与土钉间距对安全系数的影响最大。利用响应面法建立的预测模型能够提供最佳的优化方案,优化方案使土体滑移面后移,基坑的最大水平位移由9.33 mm减至5.42 mm,最大竖直沉降由16.9 mm减至11.8 mm,为该类型基坑土钉支护设计提供了参考。The aim of this research is to reveal the influence of spatial form parameters and other factors in soil nail design on the three-dimensional stability of deep foundation pits in silty clay.A deep foundation pit in a silty clay area in Hebei was taken as the engineering background.Based on the response surface method,Plackett-Burman and Box-Behnken experiments were designed.MIDAS-GTS and Design-Expert were used to establish experimental models.The influence of various parameters on the safety of soil nail support in deep foundation pits of silty clay and the applicability of optimization schemes were analyzed through numerical simulation and monitoring data.Results show that the impact of each parameter on the safety of the pit in the silty clay area,in descending order of significance,is as follows:soil nail length,slope angle of excavation,soil nail spacing,soil nail inclination,and soil nail diameter.In the combined effect of support parameters,the soil nail length and spacing have the greatest impact on the safety factor.The predictive model established by the response surface method can provide the best optimization scheme.The optimization scheme shifts the soil slip surface backward,reducing the maximum horizontal displacement of the foundation pit from 9.33 mm to 5.42 mm and the maximum vertical settlement from 16.9 mm to 11.8 mm,providing a reference for the design of soil nail support for this type of foundation pit.

关 键 词：基坑 土钉支护 响应面法 MIDAS-GTS 优化设计 

分 类 号：TU473.2[建筑科学—结构工程]