基于二阶功准则的NPR锚索支护效果研究  

Anchorage effect of NPR cable based on second-order work criterion

作　　者：胡杰 何满潮[2] 李兆华[1] 冯吉利 肖勇杰[1] HU Jie;HE Man-chao;LI Zhao-hua;FENG Ji-li;XIAO Yong-jie(College of Civil Engineering,Yango University,Fuzhou 350015,China;China University of Mining and Technology(Beijing),State Key Laboratory for Geomechanics and Deep Underground Engineering,Beijing 100083,China)

机构地区：[1]阳光学院土木工程学院,福建福州350015 [2]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《岩土工程学报》2021年第10期1870-1877,I0005,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家重大研发计划重点专项项目(2016YFC0600901);国家自然科学基金项目(41172116,U1261212);中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1718)。

摘　　要：NPR锚索因其具有恒定工作阻力和较大变形量的特性,已广泛应用于巷道的加固和监测预警中。为了研究NPR锚索在露天矿山边坡中的支护效果,首先基于有限差分软件FLAC^(3D)中的锚索单元开发出NPR锚索单元,并通过数值拉伸试验验证了NPR锚索比普通锚索具有更优异的吸能特性;之后引入二阶功作为边坡稳定性评价准则,并将其植入显式动力学算法中,详细讨论了其合理性和可靠性;最后,以浩尧尔忽洞金矿西采场北帮开挖诱发的滑坡为研究对象,对现有普通矿用锚索和NPR锚索支护体系下的边坡稳定性进行对比分析。根据数值模拟结果可知,NPR锚索支护体系下的边坡稳定性明显优于普通矿用锚索。Due to the characteristics of constant working resistance and steady large deformation,the NPR cable has been widely applied in monitoring and reinforcement of a large number of roadways.In order to study the anchorage effect of NPR cables in open-pit slope,firstly,the NPR cable element is developed based on the cable element in the finite difference software FLAC^(3D),and it is proved by the tensile tests that the NPR cable has better energy absorbing capacity than the traditional one.Secondly,the second-order work criterion is then implemented,and the rationality and advantages of the second order work criterion as a safety factor in explicit numerical algorithm are discussed.Finally,the rock slope induced by the excavation at the north side of the west stope in Haoyaoerhudong Opencast Gold Ore is taken as the research object,and the stability of rock slope under the existing traditional mine cable support system and NPR cable support system is compared and analyzed.According to the numerical results,the global second-order work and kinetic energy of each loading step have the opposite variation tendency,and the slope stability of NPR cable support system is obviously better than that of the traditional mine cable.

关 键 词：NPR锚索 安全系数 边坡稳定性 二阶功 失稳准则 

分 类 号：TU457[建筑科学—岩土工程]