论文部分内容阅读
为了揭示振动对冲击压实能力强化的效果和特性,利用压实试验机对黄土进行冲击压实的同时施以振动作用,并与单纯的冲击压实进行对比试验,从压实力和线压力、压实能量、压应力特性、压实深度特性4个方面定量研究与评价了振动施加前后冲击压实机的压实能力。研究结果表明:施以振动作用后冲击压实机的压实力和线压力提高了44%,激振强度提高了41%;压实均匀性得到提高;随着碾压遍数的增加,各层深处压应力的增长率相当,施以振动作用后压应力的增长率增大;定义了应力能量指数(stress energy index,SEI),SEI随着层深的增加而减小,施以振动作用后各层深处的SEI均增大,上、中、下3层SEI的增长率分别为23.1%、32.8%和51.9%;黄土中各层深处压应力值均得到提高,压应力随碾压遍数增加的幅度更大;上、中、下3层的压实度分别提高了8.92%、9.02%和12.1%,压实特性曲线的平均斜率提高了86.2%,说明振动对冲击压实能力的强化作用明显。
In order to reveal the effect and characteristics of vibration on impact compaction ability, the loess was subjected to impact compaction with a compaction tester and vibrated at the same time, and compared with pure impact compaction. From the compaction force and line pressure, Compaction energy, compressive stress characteristics, compaction depth characteristics of four aspects of quantitative research and evaluation of the vibration before and after impact compaction compaction ability. The results show that the compaction force and linear pressure of the impact compaction machine increase by 44% and the excitation intensity by 41%, the compaction homogeneity is improved. With the increase of the number of rolling compaction, The growth rate of compressive stress in depth is quite high, and the growth rate of compressive stress increases with the application of vibration. The stress energy index (SEI) is defined. The SEI decreases with the increase of layer depth, The SEI in the depths of all layers increased, while the growth rates of SEI in the upper, middle and lower strata were 23.1%, 32.8% and 51.9% respectively. The compressive stress values in all depths of loess were increased, The compaction degree of upper, middle and lower three layers increased by 8.92%, 9.02% and 12.1% respectively, and the average slope of compaction characteristic curve increased by 86.2%, indicating that the vibration compaction The ability to strengthen the role of obvious.