海积软土排水固结机理分析  

Analysis on Mechanism of Drain and Consolidation of Marine Soft Soil

作　　者：房后国[1] 刘娉慧[1] 肖树芳[1] 林德全[2] 

机构地区：[1]吉林大学建设工程学院,吉林长春130026 [2]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《吉林大学学报（地球科学版）》2005年第2期207-212,217,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40172092)

摘　　要：从海积软土微观结构入手,通过电子扫描显微镜(SEM)、压汞等试验发现,原状软土中孔隙和大于1 000 的小孔隙较多,微孔隙次之。随着固结压力的增加,中孔隙变为小孔隙,土体含水量也很快降至液限左右,孔隙中主要含水类型为结合水;结构单元体等效直径也随固结压力的增加而增大。由于孔隙水类型不同,随着固结压力的增大和时间的延续,软土渗透系数 K呈幂指数递减关系,固结变形曲线上有明显转折点,次固结系数也随固结压力发生非线性变化。由此可见,海积软土排水固结过程中渗透系数、变形特性、次固结系数及孔压变化规律与孔隙水类型的改变密切相关。The authors analyse marine soft soil microstructure in the process of consolidation,and find that the medium pole and small pore >1 000  are predominant. They hold free water. The micropore is secondary in undisturbed soft soil. With increment of consolidation pressure the medium pore changes into small pore, and the water content decreases to liquid limit, then the type of void water is bound water. The equivalent diameter of structure cell also increases with increment of consolidation pressure. Due to variation of pore water type the permeability coefficient decreases in power exponent with pressure increasing and time going. There is a turning point on the curve of consolidation deformation, and the coefficient of secondary consolidation is nonlinear in process of consolidation. In conclusion the permeability coefficient,deformation property,coefficient of secondary consolidation and pore pressure change with the type of pore water in consolidation process of marine soft soil.

关 键 词：海积软土 电子扫描显微镜(SEM) 孔隙 结合水 渗透性 

分 类 号：TU447[建筑科学—岩土工程]