新型GS固化土与水泥土的力学特性对比研究  

A COMPARABLE STUDY ON MECHANICAL PROPERTIES OF SOILS STABILIZED BY GS AGENT AND CEMENT

作　　者：陈鑫 俞峰[1,2] 洪哲明 潘黎芳 刘兴旺[3] 李瑛 CHEN Xin;YU Feng;HONG Zheming;PAN Lifang;LIU Xingwang;LI Ying(Institute of Foundation and Structure Technologies,Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang Provincial Engineering and Technology Research Center of Assembly-Concrete Industrialized Buildings,Hangzhou 310018,China;Zhejiang Provincial Academy of Architectural Design and Research,Hangzhou 310006,China)

机构地区：[1]浙江理工大学基础结构技术研究所,中国杭州310018 [2]浙江省装配式混凝土工业化建筑工程技术研究中心,中国杭州310018 [3]浙江省建筑设计研究院,中国杭州310006

出　　处：《工程地质学报》2022年第4期1111-1121,共11页Journal of Engineering Geology

基　　金：浙江省自然科学基金重点项目(资助号:LZ17E080002);浙江省教育厅科研项目专业学位研究生专项(资助号:Y201942631).

摘　　要：GS(Gypsum-Slag)土体硬化剂是一种由水泥、钢渣、矿渣和脱硫石膏及其他外加剂组成的新型土体固化材料。将GS土体硬化剂和水泥两种固化剂固化土作为研究对象,通过室内无侧限抗压强度试验和电镜扫描试验,研究固化土的应力-应变曲线以及土质、固化剂掺量、龄期对固化土力学性能的影响,观察其微观结构,进而对比分析GS土体硬化剂和水泥的特性,并进行现场试验加以验证。研究结果表明:相比水泥土,GS固化土应力-应变曲线存在明显峰值;GS固化土和水泥土的强度均随着掺量和龄期正增长,且GS固化土的长期强度更高;GS固化土和水泥土变形模量分别是其抗压强度的31.11~77.24倍和23.24~71.62倍;GS固化土现场成桩的完整性优于水泥土。相比水泥土,GS固化土具有强度增长快、后期强度高、经济效益好的特点,可较好满足地下工程和路基工程等土体加固应用需求。Gypsum-Slag(GS)soil hardening agent is a new type of soil curing material composed of cement,steel slag,mineral slag,desulfurization gypsum and other additives.This study focused on the GS soil hardening agent and cement and carries out a series of laboratory unconfined compressive strength tests and scanning electron microscope tests.Test results include the stabilized soil stress-strain curves and the effects of soil type,the amount of admixture and age on the mechanical properties of stabilized soil as well as its microstructure.The test program also includes a series of field tests designed to verify the laboratory data.The results indicate that the stress-strain curve of GS curing soil has obvious peak value,while that of soil-cement soil is relatively flat.The strength of the both curing soils increase with the increasement of proportion and age.However,the growth of GS curing soil strength is more uniform which is extremely different from cement curing soil.The deformation modulus of GS curing soil is 31.11~77.24 times the compressive strength,while that of cement curing soil is 23.24~71.62.In the field test,the integrity of pile formed by GS hardener is better than that of soil-cement pile.Based on the characteristics of quick increasing strength,high intensity in later period and good economic benefit,the GS agent is competent with cement in soil stabilization in underground,subgrade and other engineering.

关 键 词：GS土体硬化剂 水泥土 无侧限抗压强度 变形模量 试验 

分 类 号：TU502[建筑科学—建筑技术科学]