报告题目: Discontinuum-Equivalent Continuum Analysis of the Stability of Tunnels in a Deep Coal Mine Using the Distinct Element Method
邀请专家: Pinnaduwa Kulatilake教授,The University of Arizona, USA
报告时间: 2016年6月17日上午8:30-10:00
报告地点: 1306教室
Abstract: Stability studies on two tunnels, a horseshoe shaped and an inverted arch shaped tunnel, in a deep coal mine in China, performed using the 3DEC distinct element code were presented. The rock mass mechanical property values for the tunnel shapes have been estimated through a back-analysis procedure using available field deformation data. The back-analysis has been carried out through a pseudo-time dependent support installation routine which incorporates the effect of time through a stress-relaxation mechanism. The back-analysis indicates that the rock mass cohesion, tensile strength, uniaxial compressive strength and elastic modulus values are about 35%-45% of the corresponding intact rock property values. Additionally, the importance of incorporating stress-relaxation before support installation has been illustrated through the increased support factor of safety and reduced grout failures. The calibrated models have been analyzed for different supported and unsupported cases to estimate the significance and adequacy of the current supports being used in the mine, and to suggest a possible optimization. The effects of supports have been demonstrated using deformations and yield zones around the tunnels, and average factors of safety and grout failures of the supports. The use of longer supports and floor bolting has provided greater stability for the rock masses around the tunnels. Finally, a comparison between the two differently shaped tunnels establishes that the inverted arch tunnel may be more efficient in reducing roof sag and floor heave for the existing geo-mining conditions.
专家简介：Pinnaduwa H.S.W. Kulatilake博士，现为美国亚利桑那大学地质工程/岩土工程专业教授，亚利桑那大学岩体模拟和计算岩石力学实验室主任，美国注册土木工程师，美国土木工程师协会资深会员。曾任挪威岩土工程研究所客座研究员（1988年），瑞典吕勒奥理工大学访问教授（1989年），同济大学光华客座教授（2009~2010年），武汉大学客座教授（2010~2013年）, 2014年入选国家外国专家局“高端外国专家项目”，受聘为中国矿业大学客座教授。拥有近40年的岩石力学和岩石工程相关研究经验，其研究主要涉及采矿、岩土、地质和石油等工程领域，研究方向为岩石裂隙网络模拟、节理岩体的力学和水力特性、岩石边坡稳定性分析和概率岩土力学。迄今，Kulatilake教授已发表学术论文230余篇，在全球做过30个专题讲座和50多个特邀报告，在20多个国家和地区开设过短期课程；曾任或现任22个专业期刊的审稿人，并且是《International Journal of Rock Mechanics & Mining Sciences》、《International Journal of Geotechnical and Geological Engineering》和《International Journal of Advances in Geological and Geophysical Engineering》等国际期刊的编委；担任由亚利桑那州技术委员会主办的地质工程职业考试的主要或唯一考官已有过20余年。由于Kulatilake教授在其研究领域所取得的成就和做出的贡献，2002年他获得了俄亥俄州立大学工程学院杰出校友奖和亚利桑那大学杰出亚裔美籍教师奖。
