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研究砂土在沿着应变增量比(侧向应变增量与轴向应变增量的比值)为常数的路径加载时的力学响应具有十分重要的意义。对常规三轴试验设备进行了改造,增加量测试样体变的传感器,通过改变围压的大小来控制试样加载过程中的应变增量比,使其保持为常数。研制开发的试验设备可用于研究砂土在等应变增量比加载条件下的应力应变响应。针对砂土进行了等应变增量比的三轴试验,对试验结果的分析与比较表明系统具有足够的控制精度,从而验证了设备的有效性。
It is of great significance to study the mechanical response of sand to loading along a path that is constant along the strain increment ratio (ratio of lateral strain increment to axial strain increment). The conventional three-axis test equipment was modified to increase the amount of sample change the sensor, by changing the size of the confining pressure to control the sample during loading strain increment ratio, so as to maintain a constant. The developed test equipment can be used to study the stress-strain response of sand under constant strain increment loading conditions. A three-axis test of equal strain increment ratio for sand was conducted. The analysis and comparison of the test results show that the system has enough control precision to verify the effectiveness of the equipment.