石灰加固膨胀土机理研究综述和展望  

A Review and Prospect on the Mechanism of Expansive Soil Stabilized by Lime

作　　者：赵红华[1,2] 龚壁卫[3] 赵春吉[1,2] 刘军[3] 

机构地区：[1]大连理工大学工业装备与结构分析国家重点实验室,辽宁大连116024 [2]大连理工大学工程力学系,辽宁大连116024 [3]长江科学院水利部岩土力学与工程重点实验室,武汉430015

出　　处：《长江科学院院报》2015年第4期65-70,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金资助项目(51308091);国家"十二五"科技计划支撑项目(2011BAB10B05);中央高校基本科研业务费资助项目;归国留学人员科研启动基金资助项目

摘　　要：对石灰加固膨胀土机理的研究现状进行了综述,明确了石灰加固膨胀土性质变化的过程:离子交换是石灰加入土中最先发生的反应,之后发生絮凝和结团、结块,使膨胀土的性质快速发生变化。现有机理研究成果表明:硬凝反应是一个长期的过程,能提高土体的强度;碳酸化和结晶作用也有助于提高土体的强度;扩散和胶结是使土体内部产生变化的原因;微观结构和矿物组成的变化是石灰改性膨胀土的内因。提出了进一步从土中离子含量的定量变化、土的微观结构的定量分析、以及石灰加固膨胀土中吸力的变化等方面开展石灰加固膨胀土机理研究的新思路;并阐述了石灰加固膨胀土可能带来的环境污染基本上可以忽略。研究工作将有助于进一步揭示石灰改性膨胀土的机理。Previous research results on the mechanism of expansive soil stabilized by lime are summarized.It is clear that cation exchange is the first reaction when lime is added into expansive soil,followed by flocculation and agglomeration.These reactions change the soil’s properties quickly.Pozzolanic reaction of lime and soil is a long-term process,which helps increase the strength of expansive clay.Carbonation and crystallization also contributes to the strength increase of expansive soil.Diffusion and cementation are the causes of interior changes in the soil. Microstructure and mineralogy changes are the internal causes of stabilization of expansive soils.Moreover,analysis on the quantitative cation exchange,quantitative microstructure change,and soil suction change of expansive soil during lime treatment would be new research focus.These investigations will further reveal the fundamental mecha-nism of expansive soil stabilized by lime.The review also indicates that the possible environmental pollution caused by lime stabilization can be ignored.

关 键 词：石灰加固膨胀土 加固机理 微观结构 矿物组成 硬凝反应 

分 类 号：TU443[建筑科学—岩土工程]