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在高填方地基强夯处理过程中检测与评价强夯质量是整个工程中非常重要的一部分。对某1 000 kV特高压变电站工程高填方碎石土回填强夯地基,从理论和实践的角度出发,研究瑞利波(RWT)、动力触探(DPT)和静载荷(PLT)各试验结果的相关性,表明瑞利波和动力触探试验结果可以验证静载荷试验结果。前两者可作为强夯地基检测的间接手段,适当减少费用昂贵、历时较长的静载荷试验,节省工程造价和加快工程进度。由试验结果拟合出各试验结果之间的数学表达式表明,剪切波速和地基承载力特征值近似服从幂函数相关,与变形模量和超重型动力触探击数近似服从指数函数相关,可推测出强夯地基有效加固深度和其他地基土力学参数。根据强夯有效加固深度实测结果,提出基于梅拉公式计算结果的修正系数在0.24~0.27之间,其结果可供类似工程的设计及施工参考。
Testing and evaluating the quality of dynamic compaction in the process of dynamic compaction of high fill foundation is a very important part of the whole project. For a 1 000 kV UHV substation project of high fill gravel soil backfill dynamic compaction ground, from the theoretical and practical point of view, studies of Rayleigh wave (RWT), dynamic penetration (DPT) and static load (PLT) of each test The correlation of the results shows that the results of the Rayleigh wave and kinetic penetration test can verify the static load test results. The former two can be used as an indirect means of dynamic compaction foundation detection, appropriately reduce the expensive and long-lasting static load test, save the construction cost and speed up the construction progress. The mathematical expressions fitting the test results from the test results show that the shear wave velocity and the bearing capacity of foundation are approximately power function dependent and are related to the exponential function of the deformation modulus and the number of overweight dynamic hits, It can be inferred that the effective reinforcement depth of dynamic compaction foundation and other soil mechanical parameters of foundation. According to the actual measured results of dynamic compaction, the correction coefficient based on the Mela formula is proposed to be between 0.24 and 0.27. The results can be used as a reference for the design and construction of similar projects.