沪通铁路土压力盒标定工装设计及试验研究

为获取精确的测试数据,提出土压力盒标定需求,通过ANSYS建模分析,设计适用于试验室土压力盒的标定工装:承压板直径取32 cm,标定桶高15 cm,内径33 cm,承压板板厚2 cm,标定桶壁厚0.5 cm。并进行了试验研究,试验表明:采用最小二乘法线性拟合获得的相关系数R~2均大于0.99,线性较好,且同一量程下的2个土压力盒的砂标K_1与厂标K_2的比值相近,数据重复性较好,工装合理适用;砂标K_1大于厂标K_2,工程应用之前,结合工程实际进行标定是必要的;量程选取时,使用范围不宜超过土压力盒最大量程的2/3。

Design and Experimental Research of Calibration Device of Earth Pressure Cell Based on Hu-Tong Railway

In order to obtain accurate test data,the requirement of the soil pressure cell calibration is proposed. Through the modeling analysis of ANSYS,calibration device suitable for the soil pressure cell in laboratory is designed. The bearing plate is 32 cm in diameter and 2 cm in thickness,and the calibration barrel is 15 cm in height,33 cm in inner diameter and 0. 5 cm in thickness. The results of the experimental study show that the correlation coefficients of R~2 obtained by the least square method are all more than 0. 99 and the linearity is relatively strong; the values of K_1 and K_2 are very close when two earth pressure cells are in the same measuring range; the data have good repeatability and the device is applicable; the K_1 value of calibration test for sand soil is more than the K_2 value of factory calibration. It is necessary to conduct calibration test based on engineering practices prior to engineering application and the selected measurement range should not exceed 2/3 of the maximum range of the soil pressure cell.