MONITORING SYSTEMS AND PREVENTION TECHNOLOGIES FOR DEEP UNDERGROUND ENVIRONMENT

本项目针对地下环境问题进行了多项研究，取得了以下成果。首先，为了估计深部地下结构的行为，研究了P波通过岩石裂缝的传播特性，并且清楚了P波的RMS振幅与岩石裂缝的接触面积成正比，并且这种关系对于估计岩石裂缝的剪切过程是有用的。此外，开发了一套声发射自动测试系统，并在某地下电站施工现场进行了围岩性态评价。其次，为了开发地下环境监测系统，应用地质统计学方法，在一个隧洞施工现场，利用TBM对坝址周围的地下水位分布和隧洞掌子面以外的岩石性质进行了评价，得出了地质统计学方法是非常有效的结论。 ...更多信息 对这样的评价很有用。此外，还利用激光多普勒测振仪对超声波传播进行了精确测量，得到了正确的声速-频散曲线，为瑞利波检测和超声波无损检测奠定了基础。并对速度-频散曲线的适用性进行了讨论。此外，还开发了电阻率、弹性波、极精密倾斜仪等精密地球物理勘探技术，并将其应用于地下裂隙构造的调查。第三，为了开发使有毒物质无害化并防止有毒物质扩散/渗透的技术，研究了对控制地下物质迁移的裂缝渗透率立方定律的偏离。此外，在高放射性废物地质处置方面，对海岸海床下地下水流进行了数值分析，澄清了淡水和盐水之间的边界运动。提出了电动修复重金属污染泥质地基过程的数值分析方法，阐明了水力梯度对修复的促进作用。另一方面，从理论上探讨了动力注浆法对低渗透岩体的作用，并提出了合理的应用方法。少

In this project, several pieces of research were conducted to the problem of underground environment, and the following results were obtained. First, in order to estimate the behavior of a deep underground structure, propagation properties of P wave which transmits through a rock fracture were investigated, and it was cleared that the RMS amplitude of the P wave are directly proportional to the contact area of the rock fracture and this relation is useful to estimate the shear process of a rock fracture. Moreover, an automatic AE measurement system was developed and the surrounding rock mass behavior was evaluated at the construction site of an underground power station. Second, in order to develop a monitoring system for the underground environment, geostatistics was applied to evaluate the distribution of groundwater level around a dam site and the rock properties beyond a tunnel face at a tunnel construction site using a TBM, and it was concluded that geostatistics approach is very … More useful for such the evaluation. Moreover, a precise measurement of ultrasonic propagation using a laser Doppler vibrometer was carried out as a fundamental research for the Inspection by Reyleigh wave and the nondestructive inspection by ultrasonic wave, and correct ultrasonic velocity-dispersion curves were obtained. The applicability of the velocity-dispersion curve was also discussed. Furthermore, precise geophysical investigation technologies using resistivity, elastic wave, very precise tilt-meter, etc. were developed, and they were applied to the investigation of fractured underground structure. Third, in order to develop a technology which makes a toxic substance harmless and prevents the toxic substance diffusing/permeating, the deviation from the cube law of fracture permeability which governs the migration of substances in underground was investigated. Moreover, relating to geological disposal of high-level-radioactive-wastes, a numerical analysis for the groundwater flow under the coast seabed was performed and the movement of the boundary between fresh water and salt water was clarified. Furthermore, a numerical analysis method was proposed for the process of electrokinetic soil remediation to the argillaceous foundation polluted with heavy metal, and the promotion effect of the remediation with the hydraulic gradient was clarified. On the other hand, the effect of dynamic grouting method to a low permeable rock mass was discussed theoretically, and a rational method to apply this method was proposed. Less