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结合世界各国经验以及当前国情,我国提出建立埋深500 m左右的地下实验室,用以开展高放废物地质处置前期的相关研究。根据北山预选区三个场址的地应力实测数据,分析发现在埋深600 m范围内地应力处于中等偏低的水平,但局部的应力集中增大了岩爆发生的可能,故开展场址的岩爆风险研究。综合北山岩体力学特性,选取隧道轴线与最大水平主应力方向垂直和平行两种情况,应用工程岩体分级标准判别法、Russense判别法和Turchaninov判别法分别对三个场址400~600 m埋深范围内的岩爆风险进行预测。结果表明:旧井和芨芨槽处隧道开挖均存在不同程度的岩爆风险,而新场处几乎无岩爆发生。从岩爆风险的角度来看,以新场作为地下实验室的场址最为安全。
According to the experience of all countries in the world and the current national conditions, China proposed the establishment of an underground laboratory of about 500 m depth to carry out relevant studies on the pre-treatment of high-level radioactive waste. According to the measured data of the three sites in the Beishan preselected area, it is found that the in-situ stress is at a moderately low level within 600 m of the buried depth, but the local stress concentration increases the possibility of rock burst. Therefore, Rock burst risk research. According to the mechanical characteristics of Beishan rock mass, the vertical and horizontal principal stress directions of the tunnel axis and the maximum horizontal stress are selected. According to classification criteria of engineering rock mass, Russense discriminant method and Turchaninov discriminant method, Deep rock burst risk prediction. The results show that there is a risk of rock blasting to some extent in the excavation of tunnels in the old wells and troughs, and there is almost no rock burst in the new site. From the point of view of rock burst risk, it is safest to use the new site as the underground laboratory site.