地下采矿作用下不同表面形状的边坡变形和裂隙网试验评估

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Qianhui Li, Wenbing Shi, Lina Yu, Changwen Yang, Chun Zhu
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引用次数: 0

摘要

中国西南山区蕴藏着丰富的矿产资源,但其复杂的地形和地质条件使得地下采矿容易引发地质灾害。为全面了解采矿诱发边坡失稳的机理,建立了线性、凹陷和凹凸边坡的广义模型。利用基底摩擦试验、变形测量数字摄影测量(DPDM)技术和分形理论,分析了从采矿诱发的裂隙网形成到边坡破坏的过程。结果表明,开采面积、层数和深度的增加会导致裂隙网络和地层错位的不断调整,从而产生多样化的相互作用和发展轨迹。裂隙向地表扩展,增加了断裂岩体,降低了边坡稳定性。最大位移发生在直接顶面和斜坡的中上部,最大剪切应变集中在直接顶面、斜坡的前缘和后缘以及剪切破坏区。斜坡形状影响变形和破坏模式:直线斜坡和凹形斜坡会发生蠕变滑动和断裂,而凹凸斜坡则更容易发生弯曲和断裂。分形维数与开采深度成正比,而概率分布指数与开采深度成反比,表明裂隙发育机制是从微裂隙形成到大尺度裂隙的演化过程。裂隙网络边界的复杂性不断增加,并伴随着扩展、压实和渗透。这些发现为准确评估具有类似几何构造的斜坡的采矿诱发地质灾害奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Test evaluation of slope deformation and fissure network with different surface shapes under the action of underground mining

Test evaluation of slope deformation and fissure network with different surface shapes under the action of underground mining

The mountainous region of southwest China is rich in mineral resources; however, its complex topography and geological conditions make underground mining susceptible to triggering geological hazards. To comprehensively understand the mechanisms of mining-induced slope instability, generalized models of linear, concave, and concave-convex slopes were developed. The progression from the formation of mining-induced fissure networks to slope failure was analyzed using base friction tests, digital photogrammetry for deformation measurement (DPDM) technology, and fractal theory. The results indicate that an increase in mining area, number of layers, and depth leads to continuous adjustments in fissure networks and formation dislocations, resulting in diverse interactions and developmental trajectories. Fissures propagate toward the surface, increasing the fractured rock mass and decreasing slope stability. The maximum displacement occurring in the direct roof and the upper-middle part of the slope, and the maximum shear strain concentrated in the direct roof, the leading and trailing edges of the slope, and the shear failure zones. Slope shape influences deformation and failure modes: linear and concave slopes undergo creepsliding and fracturing, whereas concave-convex slopes are more prone to bending and fracturing. The fractal dimension is directly proportional to mining depth, while the probability distribution index is inversely proportional to mining depth, indicating that the fissure development mechanism evolves from micro-fissure formation to large-scale fissure. The increasing complexity in the boundaries of fissure networks is accompanied by expansion, compaction, and penetration. These findings provide a foundation for the accurate assessment of mining-induced geological hazards in slopes with similar geometric configurations.

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来源期刊
Bulletin of Engineering Geology and the Environment
Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合
CiteScore
7.10
自引率
11.90%
发文量
445
审稿时长
4.1 months
期刊介绍: Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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