改良滨海盐渍土物理性质及水稳定性试验研究  

Experimental Study on Improving Physical Properties and Water Stability of Coastal Saline Soil

作　　者：李方[1,2] 孙树林 张德恒[4] LI Fang;SUN Shulin;ZHANG Deheng(School of Earth Sciences and Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Department of Geologic Engineering,Jiangsu Province Nanjing Engineering Vocational College,Nanjing,Jiangsu 211135,China;State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering,Hohai University,Nanjing,Jiangsu,210098,China;School of Architecture Engineering,Nanjing Institute of Technology,Nanjing,Jiangsu 211167,China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]江苏省南京工程高等职业学校地质工程系,江苏南京211135 [3]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [4]南京工程学院建筑工程学院,江苏南京211167

出　　处：《河北工程大学学报（自然科学版）》2019年第4期58-64,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家重点实验室开放研究基金资助项目(2005408911);留学回国人员科研基金资助项目(20071108)

摘　　要：通过室内试验研究了滨海盐渍土及改良滨海盐渍土的比重、塑限、液限、塑性指数、最大干密度、最优含水量等物理性质指标;以无侧限抗压强度试验为依据研究改良盐渍土在养护龄期7、14、28、60 d的无侧限抗压强度;并以养护龄期14 d改良盐渍土试样为例,研究不同浸水时间(1、4、7、14 d)下改良盐渍土的浸水稳定性。试验结果表明:比重、液限、塑性指数和最大干密度随着掺合料总掺量增大基本呈线性减小。塑限和最优含水量随着掺合料总掺量增大基本呈线性增大。改良盐渍土无侧限抗压强度随养护龄期和掺合料总掺量增长都呈增长趋势。随着浸水时间的增长,改良盐渍土的无侧限抗压强度减小;随着掺合料总量的增加,改良盐渍土无侧限抗压强度基本呈线性增加;各配比水稳系数随着养护龄期的增长而增长;随着掺合料总掺量的增加,改良盐渍土无侧限抗压水稳系数基本都是呈线性增加;随着浸水时间增加,质量损失率范围越来越大;随着掺合料总掺量的增加,改良盐渍土质量损失率基本都是呈幂函数减小。Physical property indexes of coastal saline soil and improved coastal saline soil such as specific gravity,plastic limit,liquid limit,plastic index,maximum dry density,optimal water content were studied through laboratory experiments in this paper.Based on unconfined compressive strength test,the unconfined compressive strength of improved saline soils at the curing age of 7 d,14 d,28 d and 60 d were studied.Taking the improved saline soil samples at the curing age of 14d as an example,the stability of the improved saline soil under different soaking time (1 d,4 d,7 d,14d) was studied.The test results show that some indexes such as specific gravity,liquid limit,plasticity index and maximum dry density decrease linearly with the increase of the total content of the admixture;other indexes such as plastic limit and optimal water content increase linearly with the increase of the total amount of admixture.The unconfined compressive strength of improved saline soil increases with the increase of curing age and total admixture content.The unconfined compressive strength of improved saline soil decreases with the increases of immersion time.The unconfined compressive strength of improved saline soil increases linearly with the increase of the total amount of admixture.The water stability coefficient of each ratio increases with the increase of curing age.With the increase of the total amount of admixture,the stability coefficient of unconfined compressive water of improved saline soil basically increases linearly.With the increase of soaking time,the range of mass loss rate becomes larger and larger.With the increase of the total amount of admixture,the loss rate of modified saline soil basically decreases as a power function.

关 键 词：滨海盐渍土 无侧限抗压强度 水稳系数 质量损失率 

分 类 号：TU43[建筑科学—岩土工程]