基于正交设计的窑洞稳定性敏感性分析

发布时间：2018-05-21 17:45

本文选题：窑洞稳定性 + 正交试验　；参考：《科学技术与工程》2017年28期

【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DACB;地震工况下各因素敏感性排序为DCBA;(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。
[Abstract]:Taking the semi-circular arch curve cave as the research object, four factors and three levels orthogonal test were designed based on the principle of orthogonal test. The cave height was Ake, the cave depth was BX, the cave width was C) and the overlying soil thickness was D). The cave model with different factors and horizontal combination was established by Flac3D. The stability coefficients of each model under natural and seismic conditions were calculated by strength reduction method. The experimental results are analyzed intuitively to determine the level combination of factors which are most favorable to the stability of the cave and to rank the sensitivity of each factor. The final conclusion is as follows: 1) the level of factors most favorable to cave stability is A1B1C1D _ 1 (cave height 2 m, depth 4 m, width 2 m, overlying soil thickness 3 m) the order of factors sensitivity is DACBunder natural working condition; The order is DCBAN 3). Only the thickness of overlying soil has a significant negative linear correlation with cave stability. In addition, the sensitivity of various factors is significantly reduced under seismic conditions.
【作者单位】：西安科技大学地质与环境学院;
【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
【分类号】：TU311.2

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