论文部分内容阅读
选取寻乌南桥-龙川上坪公路路基红砂岩土为试验材料,利用动静组合加载试验装置,研究了红砂岩土峰值应力、吸收能、体积吸收能等与冲击次数和干密度之间的关系.结果表明:随着冲击次数增加,峰值应力呈“缓慢增长-急剧增长-平稳发展”3个发展阶段,拟合关系为logistic函数;随着冲击次数增加,红砂岩土试样的吸收能逐渐增加,且达到一定冲击量时,吸收能有减小趋势,吸收能与冲击次数存在二次函数关系,且相同冲击次数,干密度越大,试样吸收能越大;体积吸收能变化曲线呈S递增型,材料吸收能挤压土体颗粒间孔隙,主要表现为土体颗粒滑移,使土颗粒重新排列,增强了红砂岩土体抵抗外界冲击力;干密度对红砂岩土体积吸收能影响较大.
The red sandstone soil of Xunwu Bridge-Longchuan-Shangping Highway was selected as the test material. The dynamic and static loading test device was used to study the relationship between peak stress, absorption energy and volume absorption energy of red sandstone soil and impact times and dry density The results show that with the increase of the number of impact, the peak stress shows a “logistic function” in three stages of development, ie “slow growth - rapid growth - steady development”; as the impact times increase, the absorption of red sandstone samples Can gradually increase, and reach a certain amount of impact, the absorption can have a downward trend, the absorption energy and the impact of the number of quadratic function, and the same number of impact, the greater the dry density, the greater the sample absorption; Volume Absorption can change The curve is S-increasing type, the material absorption can squeeze the pores between soil particles, mainly as soil particles slip, so that the rearrangement of soil particles, red sandstone soil to enhance the resistance to external impact; dry density of red sandstone soil volume Absorption can have a large impact.