喀麦隆西海岸硬土的水理特性研究-2013.11.12.docVIP

喀麦隆西海岸硬土的水理特性研究-2013.11.12 2014 年 2 月第 2 期 总第 488 期水运工程Port amp; Waterway EngineeringFeb. 2014No. 2 Serial No. 488 喀麦隆西海岸硬土的水理特性研究 廖先斌，王　强，马秋柱，翁　奕，蔡泽明 （中交第四航务工程勘察设计院有限公司，广东 广州 510230） 摘要：为了加强对非洲西海岸硬土水理特性的规律性认识，提高硬土勘察设计准确性，以喀麦隆西海岸的地质调查、钻探、现场测试和室内试验成果为基础，重点研究硬土的胀缩性、崩解性和软化性等水理性质。结果表明，研究区硬土呈现无胀缩性、弱崩解-无崩解性，多面卸荷及临水状态下软化程度高，顶面卸荷及临水状态下无软化，可直接作为重力式码头基础持力层。经过研究，初步确立了非洲西海岸硬土的水理性质指标特征，提供了硬土工程设计的参考性基础资料。 关键词：喀麦隆；硬土；水理性质；胀缩性；崩解性；软化性 中图分类号：TU 195+.2 文献标志码：A 文章编号：1002-4972(2014)02-0015-05 On water-physical property of hard clay at coast of CameroonLIAO Xian-bin, WANG Qiang, MA Qiu-zhu, WENG Yi, CAI Ze-ming(CCCC-FHDI Engineering Co., Ltd., Guangzhou 510230, China) geotechnical design in the west coast of Africa, water-physical properties of hard clay in the west coast of Cameroon are analyzed according to the results of surface geological survey, drilling, in-situ test and laboratory test, focusing specially on properties of swelling and shrinkage, collapse and softening. In hard clay, the analysis demonstrates that facing water under multiple directions and unsoftening based on the status of surface unloading and facing water. The hard clay can be the bearing stratum of shallow foundation directly. According to the research, primarily water-design of hard clay are formed.there is no swelling and shrinkage, slightly to non collapse, strong softening based on the status of unloading and physical characteristics of hard clay are established in the west coast of Africa, reference data on the geotechnical Abstract: In order to fully find out water-physical characteristics of hard clay and improve the accuracy of Key words: Cameroon; hard clay; water-physical property; swelling and shrinkage; collapse; soften 中交第四航务工程勘察设计院有限公司在非 洲喀麦隆西海岸进行地质勘察时，遇到了一种介 于土与岩之间、强度大、压缩性低、标准贯入击 数大于50击的硬土。硬土一般以黏土矿物为主， 在天然状态下为不饱和土，其崩解性、软化性和 胀缩性等水理性质是影响土体物理力学性质的重 要因素。如果硬土在与水体接触后发生崩解、软 化和膨胀，会造成硬土的强度降低，压缩性增 大。因此，为了准确提供反映实际