CAJ | 학술논문

为了研究花岗岩的应变率效应及其能量耗散与破坏程度之间的关系，利用分离式 Hopkinson 压杆装置(SHPB)对直径为74 mm 的花岗岩试样进行了不同应变率下的单轴冲击压缩试验。试验结果表明，花岗岩动态压缩强度具有很明显的应变率效应；随着应变率的增大，单位体积耗散能增加，且近似呈线性关系，同时应变率也随着能量耗散率的增加而增大，但它们之间表现为非线性关系；花岗岩试样破坏程度与单位体积耗散能存在很好的一致关系，基本一一对应，而与应变率之间并不存在一一对应关系。且试样破坏程度和应变率之间并不存在一一对应关系，与强度随着应变率的增大而增大并不矛盾。
위료연구화강암적응변솔효응급기능량모산여파배정도지간적관계，이용분리식 Hopkinson 압간장치(SHPB)대직경위74 mm 적화강암시양진행료불동응변솔하적단축충격압축시험。시험결과표명，화강암동태압축강도구유흔명현적응변솔효응；수착응변솔적증대，단위체적모산능증가，차근사정선성관계，동시응변솔야수착능량모산솔적증가이증대，단타문지간표현위비선성관계；화강암시양파배정도여단위체적모산능존재흔호적일치관계，기본일일대응，이여응변솔지간병불존재일일대응관계。차시양파배정도화응변솔지간병불존재일일대응관계，여강도수착응변솔적증대이증대병불모순。
A series of uniaxial compression tests under different strain rates on granite samples (φ74 mm)were carried out using split Hopkinson pressure bars (SHPB),to study the strain-rate effect and the relationship between the degree of damage and energy dissipation of granite.The test results show that the dynamic compression strength of granite has obvious strain rate effect. The energy dissipation per unit volume increases with the increase of strain rate,showing an approximate linear relationship.At the same time,the strain rate also increases with the increase of energy dissipation rate,showing nonlinear relationship.The degree of damage of granite samples has good consistency with the energy dissipation per unit volume,generally with one to one correspondence,but does not have one to one correspondence with the strain rate.There is no contradiction between the degree of damage of granite samples having inconsistence with the strain rate and strength enhancement with the strain rate.