三峡库区泥质粉砂岩的SHPB试验及能量耗散特征研究  

SPLIT HOPKINSON PRESSURE BAR TEST AND ENERGY DISSIPATION CHARACTERISTICS OF ARGILLACEOUS SILTSTONE IN THREE GORGES RESERVOIR REGION

作　　者：黄明[1] 詹金武 胡柳青[3] 张旭东[1] 

机构地区：[1]福州大学土木工程学院,福州350108 [2]北京交通大学土木建筑学院,北京100044 [3]福州大学紫金矿业学院,福州350108

出　　处：《工程地质学报》2015年第6期1175-1181,共7页Journal of Engineering Geology

基　　金：国家自然科学基金(41202195);福建省自然科学基金(2012J05090);教育部博士点新教师基金(20123514120005)资助

摘　　要：为了研究含水状态下泥质粉砂岩的动态力学性能,进行了不同冲击速度下的分离式霍普金森压杆动载试验,重点研究泥质粉砂岩动力冲击过程中的能量耗散特征。结果表明:加载速率及含水率的变化将对岩样破坏均产生较大的影响。含水率的变化对岩样能量耗散特征产生较大影响,冲击速率越高时,试件的应变率越高,含水率越大时,比能量值及破碎程度也越高,平均破碎块度d越小;含水率的变化是导致断裂韧度变化的重要影响因素,含水率增加将导致试件的断裂韧度降低,在相同的冲击荷载下更容易断裂成碎块。This paper aims to comprehend the dynamic mechanics performance of argillaceous siltstone in the moisture conditions. It carries out the split Hopkinson pressure bar test on argillaceous siltstone under different impact speeds. The energy dissipation characteristics of the samples are carefully analyzed. The results show that the loading rate and moisture condition play a great role on the failure of rock samples. The change of moisture content has a great influence on energy dissipation characteristics of the rock sample under the same impact load. The higher the impact rate,the higher the strain rate of the specimens. The greater moisture content,the specific energy absorption and the degree of fragmentation also become higher,the average lumpiness of fragmentation becomes smaller. Change of water content is the main factor that leads to the change of fracture toughness. Increase of moisture content leads to the reduction of the fracture toughness of the specimen,which will result in breaking intosmaller pieces more easily.

关 键 词：泥质粉砂岩 含水率 能量耗散 断裂韧度 

分 类 号：P642.3[天文地球—工程地质学]