摘要
为了解三亚全新世海相软土的工程特性及形成机理,并选择适宜的工程措施解决软土工程问题,本研究采用多种试验方法:野外地质调查和室内物理力学试验、全分散法粒度分析试验、黏土矿物XRD试验、孔隙溶液化学分析试验等,分析了三亚全新世软土宏观特征、粒度组成、黏土矿物成分以及孔隙溶液性质。对比不同地区软土研究成果,分析得出了三亚全新世中晚期海相软土具有粘聚力偏高、内摩擦角偏低的力学特性以及决定这些特性的内在机理:三亚软土有效蒙脱石含量较洱海软土低,比海口软土高,而蒙脱石含量越高,软土内聚力越高;三亚海相软土的结构稳定性比三角洲相软土的稳定性高,比高原淡水湖相软土的稳定性差,但三亚软土若受淡水淋滤,则会出现灵敏性增高、强度降低、压缩性增大的现象。
In order to investigate the engineering behaviors and forming mechanism of Sanya Holocene soft marine soil and apply appropriate measures to solve engineering problems, several experimental studies were earried out： field geological survey and indoor soil tests of physical and mechanical properties, full-dispersion particle size analysis, clay mineral XRD test, chemical analysis of the pore liquid. The macroscopic characteristics, grain size distribution, mineral composition and the nature of the pore liquid of the Sanya Holocene soft soil were analyzed. With comparison of the research results of soft soils in different areas, the mechanical behavior of the middle and late Holocene Sanya soft marine clay and its mechanism are revealed, which indicate that the cohesion is higher than that of common marine clay and the internal friction angle is lower. Specifical- ly speaking, firstly, the content of effective montmorillonite is lower in Sanya soft soil than that in Erhai but higher than that in Haikou, and the more montmorillonite leads to the higher cohesion; secondly, the structure of the Sanya marine clay is more stable than that of the common marine clay, but less stable than the lacustrine clay of the plateau fresh lake. However, the Sanya soft clay becomes more sensitive with lower strength and higher compressibility if leached by fresh water.
出处
《华中科技大学学报（城市科学版）》
CAS
2010年第4期42-47,共6页
Journal of Huazhong University of Science and Technology
关键词
软土
全新世
工程地质性质
三亚
soft clay
holocene
engineering and geological properties
sanya
