Mechanical Properties of Abandoned and Closed Roadways in the Kushiro Coal Mine, Japan
Mechanical Properties of Abandoned and Closed Roadways in the Kushiro Coal Mine, Japan
复制标题
DOI：
10.1016/j.ijrmms.2011.04.012
复制
发表时间：
2011-06
影响因子：
7.2
通讯作者：
Y. Fujii;Y. Ishijima;Y. Ichihara;T. Kiyama;Satoshi Kumakura;M. Takada;T. Sugawara;Takashi Narita-Takashi-Na
中科院分区：
文献类型：
--
作者：
Y. Fujii;Y. Ishijima;Y. Ichihara;T. Kiyama;Satoshi Kumakura;M. Takada;T. Sugawara;Takashi Narita-Takashi-Na
本研究旨在探讨碎屑岩洞室群开挖损伤区的力学特性及自愈能力。在日本钏路煤矿，对近100条长达50年的封闭巷道进行了观测，这些巷道可以被视为非常严重的EDZ，没有初始密封性，并在碎屑岩中深达300 m。大多数旧的道路都被关闭了，尽管有一些仍然开放。关闭旧巷道主要是由于顶板偏斜和/或底鼓。大的塑性变形占主导地位，但是，严重的断裂很少观察到封闭的老巷道。封闭老巷道的瑞利波速度和导水率分别为0.3-1.2 km/s和5×10−7-1×10− 7 m/s，新开挖巷道周围的EDZ和EdZ（开挖扰动区）的瑞利波速度和导水率分别为1.1-1.8 km/s和1×10−8-5×10− 8 m/s。目前尾门周围的EDZ范围在1-5 m之间。提出机械开挖和防水是岩石库长期维护的关键。建议在类似深度的中硬碎屑岩体中长期维护岩石储存库时，从洞穴内部加压以降低EDZ的渗透性。
The objective of this research is to clarify the mechanical properties and self-healing ability of the Excavation Damaged Zone (EDZ) around rock caverns in clastic-rock. Observations of nearly one hundred closed roadways up to fifty years old, which can be regarded as very severe EDZs with no initial sealability and are up to 300 m deep in clastic-rock, were made at the Kushiro Coal Mine, Japan, to accomplish the objective. Most old roadways were closed, though a few remain open. Closure of old roadways was mainly due to roof deflection and/or floor heave. Large plastic deformations dominated; however, severe fractures were seldom observed in closed old roadways. Rayleigh wave velocity and hydraulic conductivity in the closed old roadways were in the range of 0.3–1.2 km/s and 5×10−7–1×10−7m/s, respectively, and those in EDZ and EdZ (Excavation disturbed Zone) around recently excavated roadways were 1.1–1.8 km/s and 1×10−8–5×10−8m/s, respectively. The extent of EDZ around the present tailgate was in the range of 1–5 m. Mechanical excavation and prevention from water are suggested as the key points for long-term maintenance of rock repositories. Pressurization from inside the cavern to decrease the permeability of EDZ is proposed for maintenance of rock repositories in medium-hard clastic-rock masses at similar depths for long periods.