基于正交设计的窑洞稳定性敏感性分析  

Sensitivity Analysis of Stability of Cave Dwellings Based on Orthogonal Design

作　　者：王念秦[1] 张帅[1] 

机构地区：[1]西安科技大学地质与环境学院,西安710054

出　　处：《科学技术与工程》2017年第28期119-124,共6页Science Technology and Engineering

基　　金：国家自然科学基金面上项目(41572287);国家自然科学基金重点项目(41130753);陕西省科技统筹创新工程计划(2013KTCL03-15)资助

摘　　要：以半圆形拱曲线窑洞为研究对象,选取窑洞高度(A)、窑洞进深(B)、窑洞宽度(C)和覆土厚度(D)为影响因素,基于正交试验原理设计四因素三水平正交试验。利用Flac3D建立不同因素水平组合的窑洞模型,通过强度折减法分别计算各模型在天然工况和地震工况下的稳定系数。对试验结果进行直观分析,确定最有利于窑洞稳定性的因素水平组合,并对各影响因素的敏感性进行排序。最终得到如下结论:(1)最有利于窑洞稳定性的因素水平组合为A_1B_1C_1D_1(窑洞高2 m,深4 m,宽2 m,覆土厚度3 m);(2)天然工况下各因素敏感性排序为D>A>C>B;地震工况下各因素敏感性排序为D>C>B>A;(3)两种工况下,仅覆土厚度与窑洞稳定性呈显著负线性相关关系。此外,地震工况下各因素敏感性显著降低。Taking semiannular-arch cave dwellings as research objects, and the A （ height）, B （depth）,width ） and D（ overlying soil thickness） of cave dwellings were employed as influencing factors. Based on principle of orthogonal experiment, the orthogonal experiment with four factors and three levels was designed. Utili-zing Flac^3 D software, the cave dwelling models with different levels of factors were built. Bduction metliod, the stability coefficients under natural condition and seismic condition of models were found out.According to intuitive analysis on experiment results, the combination of levels of different factors which was bestfor stability of cave dwellings and sensitivity priority were determined. Some conclusions were drawn eventually ：① the combination of levels of different factors which is best for stability of cave dwellings is G ! B i[ iS i （height 2 m $depth 4 m$width 2 m$overlying soil thickness 3 m ） ;② the sensitivity priority under naturC 〉 B ; the sensitivity priority under seismic condition is S 〉 C 〉 B 〉 G ;③ under both condition $ there was only a notable negative correlation between overlying soil thickness and stability of cave dwellings. In addition, the sensitivity of influencing factors decreased significantly under seismic condition.

关 键 词：窑洞稳定性 正交试验 敏感性分析 直观分析 

分 类 号：TU761.2[建筑科学—建筑技术科学]