摘要
【目的】我国黄土面积分布广泛,路基、路堤压实过程中,击实能量的有效利用,是控制散状土体重塑后工程质量的重要因素。【方法】为探知在土体压实过程中能量的传递规律,特对某地区黄土状粉土进行室内标准重型击实试验,并使用“击实过程中土中应力测试系统”对击实冲击力进行测定,对比分析了不同含水量条件下击实冲击力传递规律。【结果】分析表明:散状土体重塑过程是一个动力固结过程,作用时间十分短暂;冲击加载速率受颗粒连续性影响,土颗粒接触越密切,加载速率越大;冲击力随击实次数的增加而增大,基本呈指数函数形式,当土体趋于密实,冲击力达到峰值;含水量大小对冲击力的传递影响显著。最优含水量及其偏干侧,冲击力可以有效传递。当含水量超过最优含水量,超高孔隙水压力会抵消击实冲击力,造成能量浪费。因此,填方工程中要严格控制压实含水量,避免不必要的经济浪费。
【Purposes】Loess area is widely distributed in China,and the effective use of compaction energy is an important factor to control the engineering quality after remolding of loose soil.【Methods】In order to find out the specific law of energy transfer in the process of soil compaction,laboratory standard heavy compaction tests were carried out on loessial silt in a certain area,and compaction impact forces were measured by the“Stress test system in soil during compaction”,and the laws of compaction impact force transfer under different water content conditions were compared and analyzed.【Results】The analyses show that the remolding process of loose soil is a dynamic consolidation process,and the action time is very short.The impact loading rate is affected by particle continuity.The closer the contact of soil particles is,the higher the loading rate is.The impact force increases with the increase of compaction times,basically in the form of exponential function,when the soil tends to be dense,the impact force reaches the peak.Water content has a significant effect on impact force transmission.The optimal water content and its dry side can effectively transfer the impact force.When the water content exceeds the optimal water content,the ultra-high pore water pressure will offset the compaction impact force,resulting in energy waste.Therefore,the compaction water content should be strictly controlled in fill projects to avoid unnecessary economic waste.
作者
李婕
马富丽
白晓红
郭玉珠
LI Jie;MA Fuli;BAI Xiaohong;GUO Yuzhu(School of Vehicle and Traffic Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi,China;College of Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi,China)
出处
《太原理工大学学报》
北大核心
2025年第5期916-923,共8页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(51178287)
太原科技大学博士科研启动金(20212067)
来晋工作优秀博士奖励资金(20222143)。
关键词
黄土状粉土
击实试验
冲击力
含水量
loess silt
compaction test
impact force
water content
作者简介
通信作者:李婕,博士,讲师,主要研究方向为黄土的工程性质,(E-mail)tycomelj@163.com。
