CAJ | 학술논문

采用大三轴试验设备，对直径为300 mm、高为600 mm的圆柱体堆石料试样进行了三种不同应力路径的固结排水试验，包括常规三轴压缩试验、等平均应力试验及等向压缩试验，探讨不同应力路径下堆石料的颗粒破碎特性，常规三轴压缩试验围压为200、400、800、1200 kPa，等平均应力试验平均应力为200、400、600、800 kPa。试验结果表明，应力路径对堆石料的颗粒破碎特性有很大的影响。常规三轴压缩试验的应力—应变关系近于双曲线，低围压时试样先剪缩后剪胀、高围压时剪缩；等平均应力试验的应力—应变曲线呈应变软化型，体变表现为先体缩后剪胀。计算得到的颗粒破碎指数表明，等平均应力试验的颗粒破碎最为严重，等向压缩试验的颗粒破碎轻微。
채용대삼축시험설비，대직경위300 mm、고위600 mm적원주체퇴석료시양진행료삼충불동응력로경적고결배수시험，포괄상규삼축압축시험、등평균응력시험급등향압축시험，탐토불동응력로경하퇴석료적과립파쇄특성，상규삼축압축시험위압위200、400、800、1200 kPa，등평균응력시험평균응력위200、400、600、800 kPa。시험결과표명，응력로경대퇴석료적과립파쇄특성유흔대적영향。상규삼축압축시험적응력—응변관계근우쌍곡선，저위압시시양선전축후전창、고위압시전축；등평균응력시험적응력—응변곡선정응변연화형，체변표현위선체축후전창。계산득도적과립파쇄지수표명，등평균응력시험적과립파쇄최위엄중，등향압축시험적과립파쇄경미。
Using the large triaxial apparatus,consolidated drained tests with three different stress paths were conducted on rockfill samples with diameter of 300 mm and height of 600 mm to investigate the grain crushing properties of rockfill materials under different stress paths. The test types were the conventional triaxial compression test with confining pressures of 200,400,800 and 1 200 kPa,the constant mean stress test with constant mean stresses of 200,400,600 and 800 kPa,and isotropic compression test. The test results demonstrate that stress paths have great influence on the grain crushing features of rockfill materials. For the conventional triaxial compression tests,the stress-strain curves behave as hyperbolic curve,the volume contracts firstly and then dilate with low confining pressure,but it contracts with high confining pressure;for the mean stress tests,the stress-strain curves behave as strain softening,the volume contracts firstly and then di-late. The computed breakage index shows that the samples break seriously under constant mean stress path,while they break slightly under i-sotropic compression stress path.