水泥固化东莞滨海湾软土的强度特性及劣化机理试验研究

Experimental Study on the Strength Characteristics and Deterioration Mechanism of Cement-cured Dongguan Marina Bay Soft Soil

基于粤港澳大湾区的发展,东莞滨海湾软土由于其具有高有机质、高含水率、高压缩性和变形稳定时间过长等较差的工程性质,极大限制了区域的建设能力,因此需要使用水泥来固化软土从而提高其工程物理力学性质。以不同养护龄期和不同水泥掺量为变量探究固化软土的强度特性,养护28 d后的试样分别浸泡7d、14 d、28 d后的无侧限抗压强度研究其劣化特性,试验结果表明:随着养护时间和水泥掺量的增加,东莞滨海湾水泥固化土的强度也会随之提高,最高提升83.6%;试样强度在浸泡7 d后先下降,随后在14 d和28 d出现上升的趋势,且浸泡28 d的强度大于养护28 d的强度。

Based on the development of Guangdong-Hong Kong-Macao Bay Area,the soft soil of Dongguan Binhai Bay has poor engineering properties such as high organic matter,high water content,high compressibility and long deformation stabilization time,which greatly limit the construction capacity of the area,therefore,it is necessary to use cement to cure the soft soil so as to improve its engineering physical and mechanical properties.The strength characteristics of cured soft soils were investigated by using different curing ages and different cement admixtures as variables,and the specimens cured for 28 d were soaked for 7 d,14 d,and 28 d before measuring the unconfined compressive strength to study its deterioration characteristics.The strength of the soaked specimens at 7 d decreased,then increased at 14 d and 28 d,and the strength at 28 d of soaking was greater than that at 28 d of curing.