胶结液浓度对黄豆促沉碳酸钙改良膨胀土强度变形特性的影响  

Effects of Cementing Solution Concentration on Strength and Deformation Characteristics of Expansive Soil Treated with Soybean Induced Calcium Carbonate Precipiation

作　　者：黄丽华[1] 李明东 郎钞鹏 杨远江 朱丽萍 HUANG Lihua;LI Mingdong;LANG Chaopeng;YANG Yuanjiang;ZHU Liping(School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学土木与建筑工程学院,江西南昌330013

出　　处：《佳木斯大学学报（自然科学版）》2024年第3期115-119,173,共6页Journal of Jiamusi University：Natural Science Edition

基　　金：核资源与环境国家重点实验室开放基金(2022NRE29);国家自然科学基金(51869001)。

摘　　要：豆粉浸出液促沉碳酸钙(SICP)改良膨胀土是一种操作简单、环境友好的土体技术,本文对SICP改良膨胀土开展了探索性研究。利用室内直剪试验、无侧限抗压强度试验和压缩试验研究了不同胶结液浓度对SICP改良膨胀土的强度变形特性的影响。发现改良膨胀土的抗剪强度、粘聚力、内摩擦角、无侧限抗压强度随胶结液浓度的增加先增大后减小,改良土的压缩系数随胶结液浓度的增加先减小后增大。在胶结液浓度1mol/L时,改良膨胀土的性能最好,抗剪强度最大,无侧限抗压强度最大,提高了64%,压缩系数最小。Improving expansive soil with calcium carbonate(SICP)promoted by soybean powder leaching solution is a simple and environment-friendly soil technology.This paper makes an exploratory study on improving expansive soil with SICP.The effects of different cementing fluid concentrations on the strength and deformation characteristics of SICP-improved expansive soil were studied by indoor direct shear test,unconfined compressive strength test and compression test.It is found that the shear strength,cohesion,internal friction angle and unconfined compressive strength of improved expansive soil first increase and then decrease with the increase of cementing solution concentration,and the compressibility of improved soil first decreases and then increases with the increase of cementing solution concentration.When the concentration of cementing solution is 1mol/L,the improved expansive soil has the best performance,the largest shear strength,the largest unconfined compressive strength,an increase of 64%and the smallest compressibility.

关 键 词：膨胀土 SICP 生物岩土 强度 变形 无侧限抗压强度 

分 类 号：TU443[建筑科学—岩土工程]