基于鲁棒性的地基土承载力设计研究  

Study of Foundation Soil Bearing Capacity Design Based on Robustness

作　　者：张峰 周峰 王耀 陈成 李巧 Zhang Feng;Zhou Feng;Wang Yao;Chen Cheng;Li Qiao(CSCEC Strait Construction and Development Co. Ltd.,Fuzhou 350003,P.R. China;College of Transportation Science & Engineering,Nanjing Tech University,Nanjing 210009,P.R. China)

机构地区：[1]中建海峡建设发展有限公司,福州350003 [2]东南大学交通学院岩土工程研究所,南京210009 [3]南京工业大学交通运输工程学院,南京210009

出　　处：《地下空间与工程学报》2018年第6期1594-1602,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51278244)

摘　　要：地基土承载水平的确定至关重要,而岩土工程设计中仅考虑了地基土承载能力,忽略了设计的安全度稳定水平。针对岩土参数的不确定性对地基土承载力及计算模式的不同及对地基土极限承载力稳定水平的影响,提出基于鲁棒性的地基土承载力设计思路。首先将岩土参数作为不确定因素,利用平均值及标准差考虑参数的不确定性;其次设定基础几何尺寸作为设计参数,将承载力极限状态方程作为功能函数进行地基土承载力设计。鲁棒性设计避免了传统设计方法忽略岩土参数不确定性的不合理性,将鲁棒性作为地基土承载力的安全性评价标准,并结合经济性对基础进行多目标优化设计。通过与传统设计对比分析,证明了基于鲁棒性的地基土承载力设计方法的合理性与重要性。The determination of foundation soil bearing capacity is very important for geotechnical engineering design. Only the bearing capacity of foundation soil is taken into account,and the safety level and stability level of design are neglected. Aiming at the influence of the uncertainty of soil parameters on the bearing capacity of foundation soil and the different calculation methods,a new design based on robustness was present. Firstly,the mean and standard deviation of the soil parameters were investigated to clarify the uncertainty of soil parameters in robust geotechnical design ( RGD) method. Secondly,the sizes of the foundation were taken into consideration as design parameter,and the bearing capacity of foundation soil was designed by using the limit state equation of bearing capacity as the objective function. With the RGD approach,the cost-efficiency and robustness were the optimize target to achieve the multi-objective engineering optimization. The design scheme satisfies the bearing capacity. Meanwhile, the cost-efficiency and robustness of the design were guaranteed. A comparative analysis was made of the design on the basis of the traditional methodology and the RGD methodology,and the significance of the proposed RGD methodology.

关 键 词：地基土承载力 不确定性 鲁棒性 经济性 

分 类 号：TU43[建筑科学—岩土工程]