红砂岩土中夯击能的加固模式与加固范围研究

摘要

The indoor single-point impact test was done on red sandstone soil of southern Jiangxi by using the same tamping energy and changing the layer thickness and the tamp count, and the density of soil at different positions were tested by using homemade cutting ring. The results show that the relationship between cumulative settlement amount of soil and the cumulative tamping energy is in compliance with y=Ax/(1+Bx);there is a certain influence of depth in the soil for the transmission of tamping energy and it is increasing with energy within a certain range, but the growth rate is gradually reduced; the changes of soil density under tamping energy represent elliptical distribution approximately on the vertical plane; based on the change of the soil's density and the relationship between the settlement amount and the reinforcement depth, the theoretical formula of reinforcement depth and width is deduced.%利用相同单击夯击能，通过改变土层厚度和击数对赣南地区红砂岩土进行室内单点冲击试验，采用自制小环刀取土测试不同位置土体的密度。试验结果表明，土体的累计沉降量与累计夯击能基本符合y=Ax/(1+Bx）的关系；夯击能在土中的传播存在着一定的影响深度，且随着能量的增加在一定范围内是逐渐增加的，但增长的幅度是逐渐减小的；在夯击能量的作用下，土体密度的变化在竖直平面内近似椭圆形分布；基于土体密实度改变的特点和沉降量与加固深度的关系，推导出加固深度和加固宽度的理论计算公式。