岩石在静应力状态下的循环冲击试验及破坏模式研究  

Studyon cyclic impact experiment for rocks under static stress state and the failure mode

作　　者：化得钧[1] 刘涛[2] 

机构地区：[1]四川省煤田地质工程勘察设计研究院,成都610072 [2]西北矿冶研究院,甘肃白银730900

出　　处：《有色金属（矿山部分）》2014年第4期52-57,共6页NONFERROUS METALS(Mining Section）

基　　金：国家重点基础研究发展计划(973计划)项目(2010CB732004)

摘　　要：在冬瓜山深部采集四种岩石,并进行了单轴压缩变形试验,测得平均单轴抗压强度。以单轴抗压强度为依据,轴压选取三个级别,在中南大学SHPB动静组合加载实验机上对岩石试样进行等幅循环冲击。通过对试验数据和现象进行分析,揭示岩石在循环冲击过程中的能量传递变化规律,并从峰值应力和弹性模量的变化两个方面进行分析。对岩石的破坏模式进行分析,得到不同类型岩石的破坏失稳机理和破坏模式,为现场施工提供理论依据。Average uniaxial compressive strength is measured by uniaxial compression and deformation experi- ment for four kinds of rocks collected in deep Dongguashan Mine. According to uniaxial compressive strength, the three levels of axis pressure were chosen to impact rock sample with circle impacts. With the data and experiment phenomenon, the energy transfer change rule during the cyclic impact is revealed. The two aspectsof peak stess and the change of elastic modulus were analyzed. By analysis of rock failure mode, different types of rock instability mechanism and failure mode were obtained, which can be used as a theoretical basis for on site construction practice.

关 键 词：循环冲击 SHPB 微裂纹 应力 

分 类 号：TD315[矿业工程—矿井建设]