节理试件单轴压缩下的破碎特征分析  

Fragmentation characteristics of jointed specimen under uniaxial compression

作　　者：付裕[1] 陈新[1,2] 陆瑞全 FU Yu;CHEN Xin;LU Ruiquan(School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining andTechnology,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《煤田地质与勘探》2018年第3期98-103,共6页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41472130;11572344)~~

摘　　要：为了研究节理化程度和节理倾角对岩体破碎特征影响,对不同节理化试件在单轴压缩后的破碎体进行了筛分实验。按照单轴压缩后的碎屑粒径分布大小不同,将其分为粗粒、中粒、细粒、微粒4个级别,通过计算碎屑的粒度质量分数、粒度频数、比表面积和分形维数,分析了相同节理层间距不同节理化条件下,随节理倾角的变化,试件的块度分布特征变化规律。结果显示:随着节理倾角的增大,试件的破碎程度均是先减小后增大,β为45°时破碎程度最低,β为0°、30°、90°的破碎程度较高。节理中心距为30 mm时,节理连通率越小,破碎越严重。节理连通率为0.8时,节理中心距越大,破碎越严重。In order to study the influence of jointing degree and joint inclination angle on the fragmentation characteristics of rock mass, sieving was carried out on the fragmentation particle of different jointed specimen under uniaxial compression. Different size particles were classified into four groups including coarse, medium, small and fine particle. Fragmentation distribution law of the specimens was analyzed along with the change of joint inclination angle under the same jointing space and different jointing degree conditions by calculating the particle mass percentage, particle size, specific surface area and fractal dimension of the fragment. The results show that the degree of breakage of the specimen decreases first and then increases with the increase of the inclination angle, and the degree of fragmentation is the lowest when β = 45°, and the degree of fragmentation is high at β = 0°, 30° and 90°. When the center distance of the joint center is 30 mm, the joint connection rate is smaller, the more serious crushing. When the joint connection rate is 0.8, the greater the center distance of the joint, the more serious the fragmentation.

关 键 词：节理试件 单轴压缩 破碎特征 

分 类 号：TU45[建筑科学—岩土工程]