降水后残积土的力学特性及可注性试验研究

Experimental Study on Mechanical Properties and Groutability of Residual Soil after Precipitation

花岗岩残积土广泛存在于我国的南方地区,具有独特的物理力学特性。以厦门地铁一号线工程为依托,分析了降水后残积土地层的力学特性及浆液可注性。结果表明:降水后残积土属于高压缩黏土及高压缩性土体,渗透性较小,不属于膨胀性土;浆液可提高填石区土体的强度,达到加固效果,但当浆液比例较大时,增大浆液比例对强度影响不明显。

Granite residual soil is widely found in the south of China with unique physical and mechanical properties. Based on the Line 1 of Xiamen metro project, this paper analyzes the mechanical properties of the residual soil strata after precipitation and the groutability of the slurry. The results show that the residual soil is highly compressed clay and high compressible soil after precipitation, with small permeability and does not belong to the expansive soil. At the same time, the slurry can improve the strength of the soil in the rock fill area and reach the reinforcement effect. When the ratio of slurry is larger, the effect of increasing the slurry ratio on the strength is not obvious.