真三轴应力下铝土矿力学特性及变形破坏特征  

Mechanical properties and deformation damage characteristics of bauxite under true triaxial stresses

作　　者：杜凯 陈天宇[1] 杨成祥[1] 徐允哲 张洪铭 刘华[1] 崔光磊 刘立民 王守国 DU Kai;CHEN Tianyu;YANG Chengxiang;XU Yunzhe;ZHANG Hongming;LIU Hua;CUI Guanglei;LIU Limin;WANG Shouguo(Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang,Liaoning 110819,China;Shanxi Huarun Liansheng Energy Investment Co Ltd,Lyuliang,Shanxi 035300,China)

机构地区：[1]东北大学深部金属矿山安全开采教育部重点实验室,辽宁沈阳110819 [2]山西华润联盛能源投资有限公司,山西吕梁035300

出　　处：《采矿与安全工程学报》2024年第1期67-73,共7页Journal of Mining & Safety Engineering

基　　金：国家重点研发计划项目(2021YFC2902100)。

摘　　要：铝土矿地下工程开采过程中岩体处于复杂的三向不等应力状态,中主应力对岩体力学强度特性、变形破坏特征具有重要影响。为研究真三轴应力状态下铝土矿岩石的力学特性及变形破坏特征,基于真三轴试验机对铝土矿岩石开展了不同应力条件下的真三轴压缩试验,分析了不同应力条件对岩石裂纹萌生扩展和破裂模式的影响。研究表明:随着中主应力的提高,岩石峰值强度得到显著强化,脆性特征更加明显,破坏模式随中主应力的提高发生转变,剪切破坏裂隙从沉积层理面扩展至中主应力面,同时岩石原生裂隙对破坏模式存在诱导作用,裂隙多沿着原生裂隙扩展贯通。研究成果增强了对铝土矿岩石力学特性的认识,为煤-铝共采工程中岩石的稳定性控制提供理论依据。During the mining process of bauxite underground engineering,the rock body is in a complex three⁃way unequal stress state,and the existence of the medium principal stress has an important influ⁃ence on the mechanical strength characteristics and deformation damage characteristics of the rock body.In order to study the mechanical properties and deformation damage characteristics of bauxite rocks under the true triaxial stress state,true triaxial compression experiments were carried out on bauxite rocks under different stress conditions based on the true triaxial testing machine,and the effects of different stress conditions on the crack emergence and expansion and rupture mode of rocks were analyzed.The study showed that:with the increase of medium principal stress,the peak strength of the rock was significantly strengthened,and the brittleness characteristics become more obvious,the damage mode changed with the increase of medium principal stress,and the shear damage cracks were extended from the sedimentary lamination surface to the medium principal stress surface,and at the same time,there was an inducing effect of the primary fracture holes on the damage mode,and the cracks were mostly extend⁃ed along the primary fracture through the fracture.The research enhanced the understanding of the me⁃chanical properties of bauxite rocks and provided theoretical basis for the safety of coal⁃aluminum co⁃mining engineering.

关 键 词：煤-铝共采 真三轴试验 力学特性 变形破坏 层理结构 

分 类 号：TU45[建筑科学—岩土工程]