基于岩体扰动参数的边坡结构优化

Way for optimizing the slope structure based on the rock mass disturbance parameters

为了研究岩体扰动参数对边坡稳定性的影响,根据某露天边坡岩体物理性质及坡体钻孔勘探结果,分析了边坡体各岩组在不同扰动参数下的强度弱化过程;考虑由扰动产生的节理裂隙对边坡稳定性的影响,通过Phase^2软件对仿真计算模型进行了不同扰动程度的区域划分;同时提出了一种用于直观表征露天整天边坡稳定性的安全系数“玫瑰花”图。结果表明:各边帮受节理切割和爆破扰动的影响,稳定性差异较大,部分边帮安全储备充足,仍存在优化空间;节理裂隙几何位置对边坡失稳滑移面具有控制作用,对于近乎顺层岩质边坡,其破坏主要沿节理面剪切滑移;对于具有浅埋倾覆节理面边坡,由于岩体强度较高易发生倾倒破坏,所绘制的边坡安全系数“玫瑰花”图可直观表征露天边坡整体稳定性,考虑局部扰动影响对边坡稳定性分析进行精细化表征,为矿山边坡角度的进一步优化提供了一定的参考指标。

The present paper is inclined to make an analysis of the deformation and failure features of the sloping body when the slope is divided into 2 different regions via Phase^2 software through disturbing according to the slope disturbance degrees.Based on the Hoek-brown criteria in the strength reduction method,we have chosen 5 typical profiles,and made an extremely careful assessment of the stability of the current slope. And,then,according to the analysis results,we have further optimized the slope structure. The analysis results can be shown as follows.The strength of each rock group in the open-air slope is different under the different disturbance parameters. Among them,the calcareous mudstone group has been weakened by the blasting disturbance intensity,and the fault rock group has later been influenced most slightly. After grading the rock mass,the blasting coefficient of the shallow surface layer and the slope foot is the largest,whereas the depth of the base rock is the smallest. Considering the influence of the joint fissures on the stability of the slopes,it can be concluded that the geometric position of the joint fissures has a controlling effect on the slope-stable slip surface. For the nearly bedding rock slopes,the main faults may take place due to the shear slip along the joint plane. If there is a shallow buried and overturned joint slope,the damage would come up mainly due to the high strength of the rock mass and the dumping risk. As is seen,the parameters that can optimize the current slope structure have just been supplied above. In addition,a safety factor in the rose-flower like map has been suggested which can be used to visually characterize the stability of each side of the open-air slope in favor for analyzing the stability of the entire slope. It can directly reflect the stability of the open slope and provide better means of expression of the stability for the open-pit mine slope. What is more,the expression of the stability of the open slope can also provide an effective theoretical basis for further optimization of the slope angle of the mine.