水玻璃改良膨胀土的室内试验研究

为研究水玻璃改良膨胀土不利工程特性的实际效果,本文以芜申线航道整治工程中南京高淳地区的膨胀土滑坡治理为研究背景,通过室内试验对改性土的界限含水率、击实特性、膨胀特性、裂隙开展特性、力学强度展开了研究。研究结果表明：随着水玻璃掺量的增加,改性土的塑限逐步提高,液限逐步降低,可塑性降低,土中粘粒含量、亲水性矿物减少；改性土的最大干密度逐渐降低,最优含水率逐渐增加,击实曲线渐趋平缓；改性土的膨胀特性得到明显抑制；改性土强度随水玻璃掺量的增加有明显提高。可见掺入一定量水玻璃改良膨胀土在工程中是可行的。

Experimental Study on the Improvement of Expansive Soil by Sodium Silicate

In order to study the effect of sodium silicate to improve the unfavorable engineering properties of expansive soil, this paper has studied the limits of water content, expansion, compaction, crack development and mechanical strength of the modified soil through laboratory tests. The results show that with the increase of sodium silicate content, the plastic limit of the modified soil is increased, the liquid limit is reduced, clay content and hydrophilic mineral decrease in soil; the maximum dry density of the modified soil decreases gradually, the optimal water content gradually increases, the compaction curve gradually becomes gentle; the expansion characteristics of the modified soil are obviously restrained and the strength is improved . It can be seen that the expansive soil modified by a certain content of sodium silicate can meet the engineering requirements.