不同粒径和埋厚的煤粉对土压力计的影响

Affection of different size and depth of coal powder on pressure cell

利用传感器技术监测尾矿库等地质灾害是一种有效的方法,因此测量压力的精度就显得十分重要。而土压力计是测量压力最常见的传感器,它的测量值会受到如温度、周边材料、压力计的刚性与尺寸等因素的影响。本文以不同粒径的煤粉为对象,聚焦在煤粉层厚度和颗粒大小对土压力计响应时间的影响,探讨不同厚度、不同粒径煤粉对土压力计的影响。研究结果表明:相同粒径煤粉条件下,外界给予相同的荷载,实际检测值随着煤粉层厚度的增加而减小,同时有效荷载出现的时间也随着厚度的增加而减小(监测到荷载稳定需要一定时间);相同煤层厚度条件下,除去粒径大的煤粉以外,外界给予相同的荷载,实际检测值随着目数的增加而增加。

Using the sensors to monitor the geo-hazards such as tailing pond is a useful way but the accuracy of meas- uring pressure is often inadequate. The pressure measurement with pressure cell can be affected by different factors such as temperature, surrounding material, stiffness and size of pressure cell. In all the factors the one from the mate- rial aspect is mostly obvious. This paper focuses on the affection of different mesh coal and depth on pressure ceils. In the same mesh and same force outside, measured pressure has the inverse relationship with the depth and the response time of measured pressure would reduce with the growth of the depth （ it needs time to be stable for the measured pres- sure） ; in the same depth and same force outside, measured pressure has direct proportion relationship with the mesh except large particles. In addition, the paper focuses on how arrangements of material and contact area affect the re- sponse time which is one index that reflects the performance of a sensor.