淮北平原浅表层沉积土承载力特征及其螺旋板检测评定方法研究  

BEARING CAPACITY AND SCREW PLATE TEST FOR EVALUATION OF SURFACE SEDIMENTS IN HUAIBEI PLAIN

作　　者：段海澎[1,2] 余飞[3] 戴张俊[3] 陈善雄[3] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]安徽省交通投资集团有限责任公司,合肥230011 [3]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071

出　　处：《工程地质学报》2013年第1期158-165,共8页Journal of Engineering Geology

摘　　要：针对淮北平原地区浅表层沉积土典型地质单元,选取代表性试验区域,开展了螺旋板载荷、平板载荷和静力触探等原位测试,分析了含钙质结核黏土、新近沉积粉土、粉砂3种地基的承载力特性,重点探讨了不同类型土体的螺旋板载荷试验p-s曲线特征、承载力特征值确定方法和值域范围,并与静探和平板载荷试验数据进行对比,分析其相关关系和变化规律。研究结果表明:一般性黏土、粉质黏土和粉土的承载力较低,钙质结核黏性土和粉砂的承载力相对较高,值域范围较宽,密实程度是决定粉土、粉砂承载力大小的主要因素。螺旋板载荷试验能较好的反映多元互层地基土体力学性质的变化特征,采用等应变控制法可达到快速、分层检测的目的,并通过等应力控制法对比试验验证了其可靠性。最后通过与平板载荷试验结果进行线性拟合,给出了螺旋板载荷试验确定淮北平原浅表层地基承载力的经验公式。This paper is about the typical geological units of surface sediments in Huaibei plain. In situ tests inclu- ding screw plate tests, plate loading tests and static cone penetration tests are carried out in representative test work sites. Bearing capacity features of the calcareous concretion clay, recently deposited silt and silty sand are ana- lyzed. The p-s curve characteristics of different soils from the screw plate test and determination method and range of bearing capacity are discussed. Their correlation and variation are analyzed compared with the data from static cone penetration tests and plate loading tests. The results show that bearing capacities of the clay, silty clay and silt are lower. The calcareous concretions in clay and silty sand have relatively higher bearing capacity and wide range of values. The degree of compaction is the main factor to determine the bearing capacity of silt and silty sand. The modified mechanical property characteristics of multiple cross-bedded foundation soils can be reflected better through the screw plate test. The strain control method can be adopted as a rapid, layered detection test method and its reliability is verified with the stress control method test. By linear fitting plate loading test results, the empirical formula for the screw plate test to determine bearing capacity of foundation in Huaibei Plain is given.

关 键 词：淮北平原 螺旋板载荷试验 地基承载力 等应变控制法 

分 类 号：TU413[建筑科学—岩土工程]