土压力盒标定方法研究

Research of methods of pressure box calibration

采用刚性加载和柔性加载的方式,分别对粗粒土进行了土压力盒砂标试验,即砂标方法 1和砂标方法 2,并设计了一种新型标定方法砂标方法 3来与之对比。结果发现除了砂标方法 1标定曲线离散率太高,明显不能运用于实际以外;砂标方法 2和砂标方法 3标定曲线离散率小,可以满足室内试验精度及实际工程应用要求。然后在室内进行大型压缩试验,研究砂标方法2、砂标方法 3以及厂家提供的水标方法和笔者改善后的修正水标法在土中的适用性,经研究发现砂标方法 2和修正水压标定法对土压力的计算较适用。

The author uses the rigid and flexible loading method ,respectively for pressure box calibra- tion of coarse - grained soil, which is the first sand pressure calibration method and the second sand pressure calibration method, and designed a new methods of pressure box calibration of coarse - grained soil which is the first sand pressure calibration method comparing with them. Study found that except that the first sand pressure calibration method obviously can not be applied to practical because of the high discrete rate of the calibration curve, the second and third sand pressure calibration method have a low discrete rate of the calibration curve, which can meet the accuracy of laboratory test and engineering application requirements. Then, through the large compression experiment in door , the au- thor study applicability of the second and third sand pressure calibration method and water pressure calibration method that manufacturers provide and the author have improved, The results show that, the second sand pressure calibration method and improved water pressure calibration method are applica- ble to the count of soil pressure.