赋存环境变化对海积软土特性影响试验  

Experimental study on physical and mechanical properties of marine soft soil under environmental changes

作　　者：陈宏飞[1,2] 梁腾龙 焦文灿 吴恒[1,2] 袁海波[1,2] 周东[1,2] 王业田[1,2] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2016年第4期1082-1094,共13页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51178124;51378132);广西科技计划重点资助项目(0895004-2;0992027-3)资助

摘　　要：填海造陆对海积软土赋存环境产生的改变是多方面的,它使海积软土受到多种因素影响且以不同程度同时作用。本文以广西钦州港填海区海积软土为研究对象,采用"浸泡—加载"模拟制样技术,从孔隙液化学组分、面状荷载耦合作用角度研究赋存环境变化要素对海积软土压缩性、渗透性以及强度的影响。研究表明:孔隙液中Ca^(2+)、Mg^(2+)的作用使海积软土孔隙比减小、压缩性和渗透性降低,其浓度越高海积软土的压缩性和渗透性越低,相同浓度下,Ca^(2+)对土的压缩性影响较Mg^(2+)大,但Mg^(2+)对土的孔隙比和渗透系数的影响比Ca^(2+)显著;上覆荷载影响海积软土与浸泡液之间的离子交换,其影响程度与上覆荷载大小和浸泡液离子浓度有关;上覆荷载对土的粘聚力c值的变化起决定作用,而化学组分对土的内摩擦角φ值影响显著。The sea reclamation,in many ways,changes the environment around marine soft soil.The marine soft soil is influenced by many factors in different levels,and the factors work simultaneously. This paper focuses on the marine soft soil,which lies in the reclamation area of Qinzhou port,Guangxi Province. The ＂soaking-loading＂sample preparation technology is used to study the effectof Environmental factors on the compressibility,permeability and strength of the marine soft soil,from the aspects of pore solution and planar load coupling. Research shows that the Ca^（2＋）and Mg^（2＋）in the pore solution decrease the void ratio,compressibility and permeability of marine soft soil. The higher the concentration is,the lower the compressibility and permeability of the soft soil will be.Under the same concentration,Ca^（2＋）has more influence on the compressibility of the soil than Mg^（2＋）,but Mg^（2＋）has a stronger effect on the void ratio and permeability coefficient. The overlying load affects Ion exchange between marine soft soil and soaking liquid. The effect depends on the magnitude of overlying load and the concentration of soaking liquid. The overlying load has a decisive effect on the change of cohesion（ c）,and the chemical composition has significant effects on the intrinsic friction angle（ φ）.

关 键 词：海积软土 物理力学特性 赋存环境 化学组份 上覆荷载 填海造陆 

分 类 号：TU411[建筑科学—岩土工程]