单点高落距与两点低落距冲击荷载作用效果比较研究——以赣南红砂岩为例

Effect Comparative Study on Impact Load of Single-point with High Drop Distance and Dual-points with Low Drop Distance —— Take the Red Sandstone in South Jiangxi as an Example

利用改装后的手动击实仪器,对赣州经济开发区红砂岩土进行单点高落距与两点低落距冲击荷载作用下的击实试验,研究比较在总冲击能量相同情况下单点高落距与两点低落距这两种方案的击实效果.试验结果表明:冲击能量愈多,土体沉降量愈大,土体愈密实;该土体抗剪强度提升主要依靠粘聚力提高;两点冲击荷载会产生叠加效果,两点低落距的加固效果好于单点高落距.

Through the refitted manual compaction instrument, the experiment on the impact load with single-point high drop distance and dual- points low drop distance is made for the red sandstone in Ganzhou Economic Development Zone in Jiangxi province. The purpose of such an experiment is to compare the compaction effect of these two programs that designed in the same situation of total impact energy. The result of experiment turns out that the more impact energy is given, the more settling volumes turn out and the denser of the soil mass. The shear strength of soil mass is promoted mainly by cohensive force. The impact load between such two points generates superposition efect. Hence, the reinforcement effect of dual-point low drop distance will be better than single-point high drop distance.