用于土壤压实监测的土压力传感器标定  

Calibration of soil pressure sensors for soil compaction monitoring

作　　者：李春林[1] 陈青春[1] 丁启朔[1] 

机构地区：[1]南京农业大学浦口校区

出　　处：《实验技术与管理》2010年第4期63-66,共4页Experimental Technology and Management

基　　金：国家自然科学基金资助项目(50875131);江苏省博士后基金资助(2008304)

摘　　要：土体内的压力分布通常使用土压力传感器来测量，为了建立传感器的输入与输出之间的关系，在使用前需要对其进行标定。厂家提供的土压力传感器参数一般通过气标或油标得出，但在工程实际中土压力传感器通常是埋在土中或是嵌入混凝土板中使用，其在工作环境所受的压力不均，因此仅仅对传感器进行气标或油标是不够的。该文通过对直剪仪的改装，使其适合于土介质的传感器标定（砂标），从而实现了传感器油标和砂标试验的比较。从结果分析来看，传感器油标和砂标线性误差都很小，但砂标与油标相比存在比较大的回程误差，这一结论表明在使用传感器监测土壤压实过程之前，需要使用土介质进行传感器的标定。Pressure distribution in soil is commonly monitored with soil pressure sensors.Before its field applications calibration is required to provide the relationship between its input and output.In general,suppliers of soil pressure sensors conducted the calibration in gas or liquid media,whereas in real applications the sensors were buried in soil or embedded in concrete plate and thus the pressure was not uniformly distributed.This implies that calibrating soil pressure sensors in gas or liquid is not enough when these sensors were used in soil environment.A direct shear instrument was modified to make it suitable for calibrating the sensors with both liquid and soils,thus facilitating the possibility of comparison on the two calibration methods.The results show that linear errors for the two methods were insignificant,but the hysteresis errors of the sand calibration were higher than those of the liquid calibration.This indicates that before its use in monitoring soil stress the sensor needs to be calibrated in soils.

关 键 词：土压力传感器 标定 油标 砂标 

分 类 号：S129[农业科学—农业基础科学]