国家自然科学基金资助项目（60776821，61179062，51174145）；教育部新世纪优秀人才支持计划（NCET 08 0525）；中央高校基本科研业务费专项资金资助项目；光华同济大学土木工程学院基金项目；同济大学岩土及地下工程教育部重点实验室青年学者自主研究基金项目
当围压分别为10，20，40，80MPa时，对纤维体积分数φf为0%，0.75%，1.50%，3.00%的钢纤维混凝土进行了3×10-5，5×10-4 s-1两种应变率的常规三轴压缩试验，测出了全过程应力 应变曲线，并据此分析了纤维体积分数、围压和应变率对试验曲线的峰值应力、峰值应变及材料韧度等力学指标的影响规律.结果表明：当围压相同而φf不同时，随着φf的提高，材料的峰值应力和峰值应变均明显提高，其韧度也有所提高；当围压不同而φf相同时，随着围压的增加，材料的强度和韧度都有所提高.而且，在较低围压下往素混凝土里添加钢纤维更能够发挥其增强和增韧效果；随着加载应变率的增加，材料的峰值应力、峰值应变也有一定的增大趋势.
Conventional triaxial compression tests for steel fiber reinforced concrete with fiber volume fractions of 0%, 0.75%, 1.50% and 3.00% under four confining pressures (10, 20, 40, 80MPa) were conducted, during which two different strain rates (3×10-5, 5×10-4 s-1) were selected. Based on the obtained stress strain curves, the effects of fiber volume fraction, confining pressure and strain rate on the curve peak stress, peak strain and material toughness were investigated. The test result shows that：(1)Under the same confining pressure, peak stress, peak strain and compression toughness increase with the increase of volume fraction φf. (2)Under the same φf, with the increase of confining pressure, both compression strength and toughness show an appreciable increase. Again, under lower confining pressure the addition of steel fiber is beneficial to improve concrete strength and toughness. (3)With the increase of strain rate, peak stress and peak strain of the curves all remain to have an increase tendency.
王志亮,诸斌.钢纤维混凝土三轴压缩下的强度和韧度特性[J].建筑材料学报,2012,(3):301-306
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