珠三角饱和软土固结过程中微观孔隙结构的演化规律  

Evolution of Microscopic Pore Structure Under Saturated Soft Soil Consolidation Process in Pearl River Delta

作　　者：谢晓华[1,2,3] 周永章[1,2] 张澄博[1,2] 吴清华[1,2] 周晓芳[1,2] 卢强[1,2] 周云霞[1,2] 

机构地区：[1]中山大学地球科学系,广州510275 [2]中山大学地球环境与地球资源研究中心,广州510275 [3]广州航海高等专科学校,广州510330

出　　处：《桂林理工大学学报》2010年第3期368-373,共6页Journal of Guilin University of Technology

摘　　要：结合室内土工试验和某高速公路软基加固试验段工程,采用真空冷冻升华技术与SEM电镜扫描以及图像处理方法,获得了珠江三角洲饱和软土的孔隙度、孔隙总面积、孔隙总个数、平均孔隙周长、孔隙平均直径及孔洞复杂度等微观指标。通过对软土微观结构图像研究,得到了饱和软土受压固结过程中微结构的演化规律:珠江三角洲的饱和软粘土是一种孔隙体积占整体体积最高达66.7%的空架结构土,孔隙中充满水体,在外载荷的作用下,大孔隙首先破碎,周边折断,土体内部结构从空架式逐渐向多面体片架结构发展;伴随着孔隙直径减小,孔隙体积缩小,土粒间靠近,水体被排出的同时,土体被压缩而逐渐固结。The laboratory soil test and the soft foundation consolidation project in a certain expressway achieve a lot such as soil porosity,pore area,pore numbers,average pore perimeter,average pore diameter and hole complexity via vacuum freezing sublimation technology,scanning electron microscope and image processing method.Moreover,evolution law of microstructure under saturated soft soil consolidation process is achieved by studying soft soil microstructure picture.Saturated soft soil of Pearl River Delta is a kind of empty frame soil when pore volume of overall volume reaches 66.7%.Macropore and its peripheral broke first,when pore full of water.The soil structures develop from empty frame to polyhedron slice frame structure.With pore diameter and volume reduced when water is expelled,the soil is compressed and gradually consolidated.

关 键 词：饱和软土 微结构 微观结构参数 演化规律 真空冷冻升华 珠江三角洲 

分 类 号：TU411.92[建筑科学—岩土工程]