基于FLAC平台的岩体边坡渐进破坏模拟分析

发布时间：2018-05-02 08:21

本文选题：渐进破坏 + 强度随机性　；参考：《金属矿山》2017年04期

【摘要】：岩体边坡的强度不均匀性和局部应力集中是客观存在的,破坏往往产生于薄弱部位,而后逐渐发展造成岩体边坡的整体失稳。应用岩土分析软件FLAC~(3D)的单元力学参数赋值、单元破坏状态查询等FISH语言函数,编制了单元初始随机强度赋值与峰后残余强度置换的FISH语言程序,实现岩体边坡渐进破坏的FLAC~(3D)模拟。以大孤山露天矿东南帮边坡为工程背景建立了模拟计算简化模型,在-450 m水平开挖形成最终边坡体时有少量坡脚单元出现了塑性流动破坏,但不同强度随机样本边坡的数量和位置则有所不同,按传统评价方法可以判定边坡是稳定的。将进入塑性流动状态的单元置为残余强度后继续进行模拟计算,则坡脚破坏区逐渐增大,最后发展为边坡整体失稳。因此数值模拟时考虑岩体的强度随机性及峰后残余强度是非常必要的,岩体边坡的渐近性破坏模拟分析更贴近客观实际。
[Abstract]:The strength inhomogeneity and the local stress concentration of rock slope exist objectively, and the failure often occurs in the weak position, and then develops gradually, which results in the overall instability of the rock slope. Based on the FISH language functions such as unit mechanical parameter assignment, unit failure state query and so on, the FISH language program of initial random strength assignment and post-peak residual strength replacement of the unit is developed by using the geotechnical analysis software FLACX 3D. The simulation of progressive failure of rock slope by FLAC / 3D) is presented in this paper. Based on the engineering background of the southeastern slope of Dagushan Open-pit Mine, a simplified model of simulation calculation is established. When the final slope body is formed by -450 m horizontal excavation, a small number of slope foot elements appear plastic flow failure. However, the number and location of random sample slope with different strength are different, according to the traditional evaluation method, the slope is stable. The failure zone at the foot of the slope increases gradually and the whole slope becomes unstable after the units entering the plastic flow state are placed into the residual strength and continue to be simulated and calculated. Therefore, it is very necessary to consider the randomness of rock mass strength and residual strength after peak in numerical simulation, and the asymptotic failure simulation analysis of rock slope is closer to the objective reality.
【作者单位】：辽宁科技大学矿业工程学院;河北劳动关系职业学院;北京天成英良石材有限责任公司;
【基金】：国家自然科学基金项目(编号:51174208) 辽宁省金属矿产资源高效采选及利用工程技术研究中心开放课题(编号:USTLKEC201402)
【分类号】：TD854.6

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