振动对冲击压实能力强化的定量研究与评价  

Quantitative research and evaluation on capacity strengthening of vibration on impact compaction

作　　者：王铁庆[1,2] 杨人凤[1] 玉山江-伊布拉音 马雨平 

机构地区：[1]长安大学道路施工技术与装备教育部重点实验室,陕西西安710064 [2]西北农林科技大学机械与电子工程学院,陕西杨凌712100 [3]新疆维吾尔自治区交通建设管理局,新疆乌鲁木齐830000 [4]陕西省建设机械车辆物资总公司,陕西西安710001

出　　处：《长安大学学报（自然科学版）》2016年第3期102-110,共9页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(50578017);陕西省交通厅科技项目(06-25K;14-02K)

摘　　要：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 capacity strengthening effect of vibration on impact compaction,this paper used impact compactor in compaction test of loess,which conducted impact compaction on the loess with vibration effect at the same time.Comparing with the pure impact compaction,this paper quantitatively analyzed and evaluated the impact compactors’compaction capacity before and after the vibration being applied from four aspects of compression strength and line pressure,compaction energy,stress characteristics and compaction depth characteristics.The results show that with the vibration effect,the impact compactors’compression strength and linepressure both increase by 44%,and the excitation intensity increases by 41%;compaction uniformity is improved;with the increase of rolling times,growth rates of compressive stress in three deep layers are similar,and increase after applying vibration effect;SEI（stress energy index）decreases with the increase of layer depth;SEI increases in each layer after applying vibration effect,and its growth rates in upper,middle and lower layers are respectively 23.1%,32.8% and 51.9%;compressive stress improves in the loess layers of all depths,and compressive stress increases more greatly with the increase of rolling times;compaction degrees in upper,middle and lower layers increase by 8.92%,9.02% and 8.92% respectively;and the average slope of compaction characteristic curves increases by 86.2%.It indicates that the role of vibration is obvious on the impact compaction capacity strengthening.8tabs,7figs,21 refs.

关 键 词：机械工程 冲击压实 振动 压实能力 黄土 评价 

分 类 号：U415.521[交通运输工程—道路与铁道工程] U416.1