基于正交试验法的岩土工程敏感应力方向性等效转换  

Directional Equivalent Transformation of Sensitive Stress in Geotechnical Engineering Based on Orthogonal Experimental Method

作　　者：邢国起[1] 柳长江[1] 玄伟 XING Guo-qi;LIU Chang-jiang;XUAN Wei(College of Architecture Engineering,Weifang University,Weifang 261061,China)

机构地区：[1]潍坊学院建筑工程学院,潍坊261061

出　　处：《科学技术与工程》2020年第35期14600-14605,共6页Science Technology and Engineering

基　　金：山东省高等学校科学技术计划(J17KB059);潍坊学院博士基金(2017BS14)。

摘　　要：为解决传统方法分析岩土材料应力时等效围压、等效偏应力比计算结果不准确的问题,提出基于正交试验法的岩土工程敏感应力方向性等效转换研究方法。首先旋转综合张量,使其与应力张量处于同一空间坐标系;然后,计算各向异性下岩土颗粒接触的等效应力张量,获取等效应力。基于等效围压与等效偏应力构建各向异性与应力方向性的等效转换模型,采用正交试验法进行模型参数敏感性分析,完成岩土工程敏感应力方向性等效转换研究。实验结果表明,所提方法的等效围压、等效偏应力比计算结果与实际值基本一致,应力敏感性计算精度高达98%,抗干扰性好,且整个研究过程计算耗时也远低于其他文献方法,验证了所提方法的优越性。There are problems of low accuracy of the calculation results of the equivalent confining pressure and the equivalent deviator stress ratio when the traditional method is used to analyze the stress of geotechnical materials.In order to solve those problems,a study method of the directional equivalent transformation of the sensitive stress of geotechnical engineering based on the orthogonal experimental method was proposed.Firstly,the comprehensive tensor was rotated and made in the same spatial coordinate system as the stress tensor.Then,the equivalent stress tensor of the contact of the rock and soil particles under the anisotropy was calculated to obtain the equivalent stress.Based on the equivalent confining pressure and the equivalent deviator stress,the equivalent transformation model of anisotropy and stress directionality was constructed,and the sensitivity analysis of model parameters was carried out by the orthogonal experimental method.It was used to complete the equivalent transformation research of sensitive stress directionality in geotechnical engineering.The experimental results show that the calculation results of the equivalent confining pressure and the equivalent deviator stress ratio of the proposed method are basically consistent with the actual values,the calculation accuracy of stress sensitivity is as high as 98%,and the anti-interference is good.The calculation time of the whole research process is far less than other literature methods,which verifies the superiority of the proposed method.

关 键 词：正交试验法 岩土材料 应力方向性 各向异性 敏感性 等效转换模型 

分 类 号：TU431[建筑科学—岩土工程]