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

This paper is about the typical geological units of surface sediments in Huaibei plain. In situ tests including 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 analyzed. 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.