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深基础的承载力通常是由静载荷试验确定的。但这种方法费钱费时,而且在一些实际工程中不可能进行。由于这些限制,在大型工程中只对少数几根桩做静载试验,而在小型工程中可能一根也不做。近年来,撞击条件下桩顶的动态测量已被用于估计深基础的承载力。因为快速和费用相对较低,在世界许多国家,这些试验正逐渐成为常规试验。分析和量测技术的不断发展,提高了它们的经济性和可靠性。本文选择了十个对同样的桩分别进行了动测和静力试验的工程实录。这些实录中包括打入桩和钻孔桩。打入桩用柴油锤和空气。蒸汽锤打入。钻孔桩的试验采用专门的加行装置。土质条件包括砂、粉土、粘土、石灰质土和岩石。其结论为,在不同条件下,用桩顶动测成果来确定深基础的静承载力与在各种条件下用静力测试成果相比,其差别在107以内。
The bearing capacity of deep foundations is usually determined by static load tests. However, this method is expensive and time-consuming, and it is impossible to carry out in some practical projects. Due to these limitations, only a few piles are tested for static loading in large-scale projects, and they may not be used for small projects. In recent years, dynamic measurements of pile tops under impact conditions have been used to estimate the bearing capacity of deep foundations. Because of the rapidity and relatively low cost, these tests are gradually becoming routine tests in many countries in the world. The continuous development of analysis and measurement technologies has improved their economics and reliability. In this paper, ten engineering records were recorded for the same pile and the static test. These records include driving piles and bored piles. Drive the pile with a diesel hammer and air. Steam hammer hit. The bored pile was tested using a special addition device. Soil conditions include sand, silt, clay, calcareous soil, and rock. The conclusion is that, under different conditions, the static bearing capacity of the deep foundation determined by the pile top dynamic test results is within 107 in comparison with the static test results under various conditions.