岩石的非均质性对其材料强度尺寸效应的影响  

Influence of rock inhomogeneity on strength-size effect of rock materials

作　　者：吕兆兴[1] 冯增朝[1] 赵阳升[1] 

机构地区：[1]太原理工大学采矿工艺研究所,山西太原030024

出　　处：《煤炭学报》2007年第9期917-920,共4页Journal of China Coal Society

基　　金：国家自然科学基金重大资助项目(50534030);国家自然科学基金资助项目(50404017);山西省自然科学基金资助(20051026)

摘　　要：采用非均质数值试验的方法,研究了非均质参数m对岩石材料强度尺寸效应的影响,提出尺寸效应影响参数η,其值越大尺寸效应越明显.研究表明:随着非均质参数m的增加,尺寸效应影响参数η的值先增加后减小,当m→+∞时η→0.在m=2附近时η达到最大值,此时的强度尺寸效应最明显.η在1.65≤m≤3范围内变化最为剧烈,所以当非均质参数m在此范围内时,岩石材料的强度尺寸效应在明显和不明显之间变化幅度最大.Based on numerical test of inhomogeneity, studied the influence of inhomogeneity parameter m on size effect of the strength of the rock material. The size effect parameter η was proposed, with increasing of the value of size effect parameter, size effect was more obvious. Results indicate： with increasing of inhomogeneity parameter, size effect parameter increases in the beginning and decreases at a later time, η→0 as m→＋∞. when the value of m is on a neighbourhood of 2, the value of η can achieve maximum, on this condition, strength-size effect is very obvious. The change of the value of η is even more acute while 1.65 ≤m≤3, so as inhomogeneity parameter m varies from 1.65 to 3, the obvious size effect becomes of inconspicuous one.

关 键 词：岩石力学 非均质性 尺寸效应 单轴压缩 岩石强度 

分 类 号：TU452[建筑科学—岩土工程]