地下岩体温度变化影响区域探测方法的实验研究

Monitoring method for influence circle due to temperature variation in underground rock stratum

在室内对沉积岩的砂岩和泥岩进行了多组岩样加热实验,给出了室内实验泥岩和砂岩温度上升与电阻率变化关系的回归方程。在东京郊区某野外地下实验场内进行了泥岩岩体的原位加热实验,使用特制的物探设备取得了温度变化各个阶段对应的岩体电阻率数据,通过处理解析取得的数据,了解了温度上升时原位岩体电阻率变化的实际情况。室内岩样实验与室外原位岩体实验研究结果表明:通过使用电法物探设备监测岩体的电阻率变化情况,可以及时了解地下高温源对围岩体的温度影响场范围。该实验研究为目前核废料储存及处理时,探测围岩体受高温影响的范围提供了一种可视化的监测方法,并研究了该方法在野外原位使用的可行性。

The variation relation between influence circle and temperature variations of underground rock stratum is highlighted based on laboratory and field tests.The laboratory temperature variation tests on a series of sandstone and mudstone rock are performed,and then a regression equation based on the test data is developed.While the field tests are carried out in the suburbs of Tokyo with the aim to get the electrical resistivity data in different temperature variation periods by special geophysical equipment,and the real variation rate of electrical resistivity with the increase of temperature is thus revealed.It is proved that the temperature diffusion map of rock under the heating source can be visualized by real-time measuring the electrical resistivity variation at different points of the underground rock stratum.Embedding unclear waste deeply into the sedimentary rock is a widely treatment for disposal nuclear waste disposal.The present research puts forwards a feasible monitoring method for the influence circle of nuclear waste disposal.