CAJ | 학술논문

采用RMT-150 B岩石力学试验机，对七种不同高径比的石膏试样进行了单轴压缩试验，分析其力学特性及其破坏特征。根据单轴压缩力学试验结果，利用能量耗散理论，分析其能量耗散特性。研究结果表明：随轴压应力的增加，石膏试样内部微裂隙先闭合，而后在其尖端产生了新裂隙；新裂隙随轴压应力的增加而逐渐地扩展、贯通、形成破裂面，最终发生剪切滑移破坏；石膏试样的体积应变随轴压应力的增大，经历了先压缩后增加，最后急剧膨胀，表现出明显的非线性变形；石膏试样的峰值应力、弹性模量随高径比的减小而增大；轴向应变和横向应变随高径比的减小而减小；变形模量与高径比之间的关系不明确，不能用其表征石膏试样的变形特性；高径比越大的石膏试样受压后容易发生剪切破坏，破坏时吸收的能量增量越快，属于脆性破坏，而高径比越小的石膏试样则发生压酥破坏，属于塑性破坏。
채용RMT-150 B암석역학시험궤，대칠충불동고경비적석고시양진행료단축압축시험，분석기역학특성급기파배특정。근거단축압축역학시험결과，이용능량모산이론，분석기능량모산특성。연구결과표명：수축압응력적증가，석고시양내부미렬극선폐합，이후재기첨단산생료신렬극；신렬극수축압응력적증가이축점지확전、관통、형성파렬면，최종발생전절활이파배；석고시양적체적응변수축압응력적증대，경력료선압축후증가，최후급극팽창，표현출명현적비선성변형；석고시양적봉치응력、탄성모량수고경비적감소이증대；축향응변화횡향응변수고경비적감소이감소；변형모량여고경비지간적관계불명학，불능용기표정석고시양적변형특성；고경비월대적석고시양수압후용역발생전절파배，파배시흡수적능량증량월쾌，속우취성파배，이고경비월소적석고시양칙발생압소파배，속우소성파배。
The uniaxial compression mechanical test of the gypsum sample with seven differ-ent height to diameter ratios were measured by using RMT-150B rock mechanics testing ma-chine,and the mechanical properties and failure characteristics of the gypsum sample were analysed. Based on the test results,the energy dissipation characteristics of the gypsum in different height to diameter ratios were investigated by using the energy dissipation theory. The results show that the microcracks within the gypsum sample is closed firstly,and then produces a new fractures at the tip of the microcracks,and the new fractures are gradually expanded,run through crack,forming fructure plane,shear and slip failure with the increase of the uniaxial compressive stress. The volume strain of the gypsum sample is compressed firstly and then increases and rapid expands finally with the increase of the uniaxial com-pressive stress. The peak stress and elastic modulus increase with the decrease of the height to diameter ratio,and the axial strain and the lateral strain decrease with the decrease of the height to diameter ratio,and the relationship between deformation modulus and height to di-ameter ratio is not evident,which can not characterize the deformation characteristics of the gypsum sample. The gypsum sample that is easy to have shear and slip failure and is quick to absorb energy with the increase of the height to diameter ratio belongs to brittle failure, and on the contrary that is easy to have crisp failure,belongs to plastic failure.