Development of fracture sealing technique in deep underground

这项研究提出了一种有效的低渗透岩体封闭系统，这是高放废物地质处置最重要的技术之一。本研究主要讨论了以下三个主题：(1)深部地质条件预测方法。(2)深部水文地质结构评价方法。(3)深部低渗透岩体高效注浆技术。对于课题(1)，在智能TBM、反射层析成像等新数据获取技术的基础上，发展了地质条件地质统计预测与评价方法。对于课题(2)，为了探测非均质地下水流动路径，提出了一种新的岩体水文地质结构成像方法，该方法强烈地控制了洞室周围EDZ(开挖扰动带)的水力行为。利用井间液压…的数据更多的考验。针对课题(3)，进行了多次室内和现场动态注浆试验，以掌握动态注浆的效果。为评价动力注浆效果和确定最佳注浆参数，提出了注浆渗透机理的理论模型。在此基础上，利用所提出的理论模型对试验结果进行了分析，充分验证了该模型的适用性，并对动态注水效果进行了定量评价，在此基础上构建了一套合理的低渗透岩体裂隙封堵系统，使我们能够充分评价非均质地下水流路径，进而对其进行充分封堵。希望该系统能为本课题的研究做出贡献。和高放废物库流动屏障系统的开发，以及LPG储气库、CAES G/T等高压储气库的实现。

This study suggests an efficient sealing system for low permeable rock mass, which is one of the most important required technologies for the geological disposal of high-level radioactive waste. The following three subjects are mainly discussed inthis study ;(1)Prediction method of geological condition in deep underground.(2)Evaluation method of hydro-geological structure in deep underground.(3)Effective and efficient grouting technique for low-permeable rock mass in deep underground.For the subject (1), The geostatistical prediction and evaluation method of geological condition is developed on the\basis of the new data acquirement technique such as intelligent TBM, reflection tomography, etc. For the subject (2), a new imaging method for hydro-geological structure in rock mass is developed in order to detect heterogeneous groundwater flow path, which strongly governs the hydraulic behavior of EDZ (excavation disturbed zone) around rock caverns, using the data from cross-hole hydraulic … More test. For the subject (3), several laboratory and field tests on dynamic, grouting were carried out in, order to grasp the effect of dynamic grouting. A theoretical model to explain the mechanism of grout penetration is proposed for evaluating the effect of dynamic grouting and determining the optimum specifications. Furthermore, the results of these tests are analyzed using the proposed theoretical model, and then the applicability of the proposed model is sufficiently verified and the effect of dynamic injection is evaluated quantitatively.Thus, a rational fracture sealing' system for low-permeable rock mass, which allows us to evaluate heterogeneous groundwater flow paths sufficiently and then to seal them sufficiently, is constructed on the basis of the above-mentioned examination. This system is expected to contribute to the research. and development of flow barrier system of HLW repository, and the realization of high-pressure gas storage caverns such as LPG storage cavern, CAES G/T, etc. Less