土石混合体边坡力学特性及稳定性分析方法研究进展  

Research Progress on Mechanical Properties and Stability Analysis Methods of Soil-Rock Mixture Slope

作　　者：石广斌[1] 周泽凯 SHI Guangbin;ZHOU Zekai(School of Resource Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055

出　　处：《金属矿山》2024年第10期202-215,共14页Metal Mine

基　　金：国家自然科学基金项目(编号:42272342);陕西省教育厅基金项目(编号:21JK0719)。

摘　　要：土石混合体边坡在我国分布比较广泛,在降雨、地震等外力作用下会产生滑坡等变形破坏现象。归类和分析了土石混合体力学特性物理模型试验和数值模拟试验以及边坡稳定性分析方法研究成果,得出块石尺寸和含石量是影响土石混合体剪切特性主要因素,块石排列可以忽略不计;雨水和冻胀等能够显著改变土石胶结介质力学参数,降低率约为20%;通过对比多种稳定性分析方法,认为离散单元法或数值流形法、连续—非连续耦合方法能够更有效分析具有强烈非均质体的土石混合体边坡。在总结已有研究成果和考虑土石混合体介质特点的基础上,提出了土石混合体力学特性和此类边坡稳定性分析方法研究上存在的不足之处,即:①在获取土—石胶结接触面力学参数相关特性指标上,缺少精密的试验设备或仪器,无法准确地测得接触面参数;②在土—石胶结接触面力学模型构建上,忽略了土体与块石间存在嵌入等情况,无法充分反映土—石胶结接触面在外力作用下的力学行为;③目前土石混合体边坡稳定性研究主要关注坡体力学特性以及降雨等作用下的相关参数变化,很少涉及多应力场(如降雨、地震、低温等组合作用)下的土石混合体边坡数值模拟,无法满足实际工程问题的相关需求;④现阶段构建三维土石混合体边坡数值模型上,仅有少数考虑结合数字图像等计算机技术还原真实块体下的三维数值模型,尚需进一步研究分析块石接触面差异分布、超大粒径块石模拟等相关问题。The soil-rock mixture slope is extensively distributed throughout our country and is prone to deformation and failure phenomena,such as landslides,under the influence of external forces like rainfall and earthquakes.In this paper,the outcomes of physical model tests,numerical simulation tests,and slope stability analysis methods are categorized and analyzed.It is concluded that the size and stone content of the blocks are the predominant factors influencing the shear characteristics of the soil-rock mixture,and the block arrangement can be disregarded.Rain and frost heaving can significantly alter the mechanical parameters of the soil-rock bonding medium,with a reduction rate of approximately 20%.Through comparing various stability analysis methods,it is indicated that the discrete element method,the numerical manifold method,and the continuous-discontinuous coupling method are more efficacious in analyzing soil-rock mixture slopes with strong heterogeneity.After summarizing the existing research findings and considering the features of the soil-rock mixture medium,the deficiencies in the research on the mechanical characteristics of the soil-rock mixture and the stability analysis method for this type of slope are presented,namely:①In obtaining the relevant characteristics of the mechanical parameters of the soil-rock bonding contact surface,the dearth of precise test equipment or instruments leads to an inability to accurately measure the contact surface parameters;②In the establishment of the mechanical model of the soil-stone bonding contact surface,the inter-embedding between soil and stone is overlooked,and the mechanical behavior of the soil-stone bonding contact surface under external forces cannot be fully manifested;③Currently,research on the stability of soil-rock mixture slopes mainly focuses on the physical characteristics of the slope and the variations of relevant parameters under the action of rainfall,etc.,and rarely involves the numerical simulation of soil-rock mixture slopes under multip

关 键 词：土石混合体边坡 力学特性 稳定性分析方法 土—石胶结接触面参数 

分 类 号：TD854.6[矿业工程—金属矿开采]