摘要
近些年,滑坡地质灾害发生的强度和频率逐年上升。在滑坡发生过程中,传统预应力锚索无法抵抗岩土体大变形而发生拉断、破坏、失效等问题。针对上述问题,自主研发了三种不同类型的高恒阻大变形锚索(NPR锚索),其核心结构由恒阻装置与传统锚索连接组成。首先,通过现场静力拉伸试验,得到该新型锚索结构最大恒阻力值约850 kN,最大变形量达2000 mm;其次,在ABAQUS中采用STATIC,GENERAL准静态分析方法对静力拉伸条件下恒阻装置的应力应变特性进行数值模拟分析,分析结果证明NPR锚索拉伸过程是一个恒阻且吸收能量的过程;最后,现场应用验证了NPR锚索结构能够随着边坡失稳而产生大变形的特性,避免了传统锚索因大变形而被拉断破坏,实现了滑坡灾害防治、监测、预报智能一体化的目标,为合理解释滑坡体运移规律与监测预警曲线之间的关系提供了科学依据。
In recent years,the intensity and frequency of landslide geological disasters have been increasing year by year.In the process of landslide occurrence,the traditional prestressed anchor cable can not resist the large deformation of rock and cause problems such as breaking and failure.In response to the above problems,three different types of high-resistance large deformation anchor cables(NPR anchor cables)have been independently developed.Its core structure consists of a constant resistance device connected with a traditional anchor cable.Then,through the field static tensile test,it is confirmed that the cable can provide a maximum working resistance of 850 kN and a large deformation of 2000 mm.Secondly,using STATIC and GENERAL quasi-static analysis method in ABAQUS,the numerical simulation analysis of the stress-strain characteristics of the constant resistance device under static tension is carried out.The analysis results prove that the NPR anchor cable stretching process is a process of constant resistance and energy absorption.Finally,through field application,it is verified that the NPR anchor cable structure can be deformed greatly with the instability of the slope,which avoids the traditional anchor cable being broken due to large deformation.It achieves the goal of intelligent integration of landslide hazard prevention,monitoring and forecasting and provides a scientific basis for reasonably explaining the relationship between the law of landslide migration and the monitoring and early warning curve.
作者
陶志刚
李梦楠
庞仕辉
谷明
何满潮
Tao Zhigang;Li Mengnan;Pang Shihui;Gu Ming;He Manchao(State Key Laboratory for Geomechanics and Deep Underground Engineering,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China;Nanfen Open-pit Iron Mine Benxi Iron and Steel Group,Benxi Liaoning 117000,China)
出处
《矿业科学学报》
2020年第1期34-44,共11页
Journal of Mining Science and Technology
基金
国家重点研发计划(2016YFC0600901)
中央高校基本科研业务费(2015QB02)
关键词
恒阻大变形锚索
数值分析
负泊松比
静力拉伸
constant resistance and large deformation anchor cable
numerical simulation analysis
negative poisson s ratio
static tensile
