黄土力学参数的相关性对生土窑居可靠度的影响  

Influence of Loess Mechanical Parameter Correlation on Earth-sheltered Dwellings Reliability

作　　者：郭平功[1,2] 童丽萍[1] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]河南城建学院土木工程系,河南平顶山467036

出　　处：《河南科技大学学报（自然科学版）》2013年第5期59-63,7-8,共5页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(50978233)

摘　　要：为揭示生土窑居在役百年或数百年的深层次原因,对其进行可靠度分析。基于有限元强度折减法,提出"富裕安全因数"作为生土窑居承载能力极限状态的标准;在广义随机空间中使用响应面法,用不含交叉项的二次多项式响应面函数代表功能函数,对河南三门峡陕县的生土窑居的可靠度进行了研究。研究结果表明:该地区生土窑居可靠性较高,黄土是营造生土窑居的天然有利条件,不考虑黏聚力和内摩擦角的负相关性时,所得可靠指标是保守的。In order to uncover the reason why earth-sheltered dwellings can survive hundreds of years,the reliability of earth-sheltered dwellings was researched. Based on finite element strength reduction method, excess safety factor was suggested as the standard of earth-sheltered dwellings ultimate limit state. Response surface method in generalized random space was used,and performance function of earth-sheltered dwellings was expressed by quadratic polynomial without cross terms. The reliability of earth-sheltered dwellings in Shan county,Henan province was researched. The results show that the reliability of earth-sheltered dwellings in this area is high. Loess is the natural advantage for earth-sheltered dwellings construction. When the correlation between cohesion and internal friction angle is not considered,the reliability index is conservative.

关 键 词：负相关 富裕安全因数 响应面 广义随机空间 黏聚力 内摩擦角 

分 类 号：TU761.2[建筑科学—建筑技术科学]