新场岩体定压力压水试验数据解译方法的对比

Comparison of CHI test data interpretation method in Xinchang block

以高放废物地质处置北山预选区新场岩体三个深钻孔的定压力压水试验为例,分别从压水阶段数据求解、压力恢复阶段数据求解和特殊试验段参数求解3个方面,对稳定流公式法和非稳定流参数拟合法进行了对比,得到了如下结论：非稳定流参数拟合法较稳定流公式法适用的渗流类型更多,使用数据量更大,结果更为可靠；在压水阶段和压力恢复阶段数据完整时,优先选择压力恢复阶段非稳定流参数拟合结果作为试验段的渗透系数.依据上述筛选原则,得到了新场岩体BS17～BS19三个深钻孔渗透系数的概率分布图,可初步判断新场岩体为低渗透性岩体,适宜于高放废物地质处置.

By taking the CHI （Constant Head Injection） tests performed in three boreholes of Xinchang block in the candidate Beishan area for geological disposal of high level radioactive waste as an example, the steady formula method and transient curve matching method were compared in 3 aspects： interpretation of the injection period, interpretation of the recovery period and interpretation of special tests. It was found that the transient curve matching method is suitable for more flow models and can manipulate more data and conductivity obtained from the recovery period is more reliable than the injection period. According to the optimizing rule, conductivity probability distribution of three borehole （BS17-BS19） were obtained, Xinchang block is of low-permeability and suitable for the disposal of HLW.