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压力盒标定时,必须让标定筒内压力盒的工作状态与现场接近。实验用的标定筒如图所示。介质为亚粘土。经反复加、卸载试验发现,各个压力盒的输出值在同一荷载下并不相同。当压力盒位于标定筒中心轴线上,深度为12厘米,压力为6kg/cm~2时,压力盒的输出值略大于水标结果;但当深度为40厘米时,输出值反而比水标结果小。加载与卸载曲线亦因埋设位置不同而异:埋设深度较浅,两个
When calibrating the pressure box, the working condition of the pressure box in the calibration cylinder must be close to the scene. Experimental calibration cylinder as shown. Medium is sub-clay. After repeated add and unload test found that the output value of each pressure box in the same load is not the same. When the pressure box is located on the central axis of the calibration cylinder, the depth of 12 cm, the pressure of 6kg / cm ~ 2, the pressure box output slightly larger than the water standard results; but when the depth of 40 cm, the output value instead of water standard results small. The loading and unloading curves also vary depending on the embedding position: the embedment depth is shallow, two