Comparative study on different methods to determine the bearing capacity of sand gravel layer
Due to the characteristics of buried depth,large grain size,and difficulty in obtaining undisturbed samples of gravel layers,it is challenging to obtain their physical and mechanical parameters through labora-tory tests.In situ testing methods are commonly used to understand the engineering properties of gravel lay-ers,thereby obtaining the bearing capacity and deformation parameters of the foundation.Taking the sandy gravel layer of the Jilang Beach in the upper member of the Xingkun Sandstone Formation on the left bank of the Cihaxia Hydropower Station as the research object,in situ tests such as load tests,pressure meter tests,and super heavy dynamic probing tests were conducted.The bearing capacity of the gravel layer was calculat-ed using different methods for comparative analysis.The results indicate that the bearing capacity deter-mined by load tests is the smallest,and the bearing capacity determined by pressure meter tests is the lar-gest,approximately 1.37 times that of the load test.The estimation results based on several other methods using super heavy dynamic probing are slightly higher,generally ranging from 1.13 to 1.21 times the value of the load test,and suggestions for the selection of values for different methods of estimating the bearing ca-pacity are accordingly proposed.
bearing capacityload testpressure meter testsuper heavy dynamic Probingsandy gravel layer
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