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采选技术与矿山管理

外荷载下青砂岩声发射特征及损伤演化规律

  • 王文才 , 1 ,
  • 李俊鹏 , 1, 2 ,
  • 王创业 1 ,
  • 陈世江 1 ,
  • 王鹏 1
展开
  • 1. 内蒙古科技大学矿业与煤炭学院,内蒙古 包头 014010
  • 2. 山西工学院能源产业学院,山西 朔州 036000
李俊鹏(1989-),男,山西朔州人,博士研究生,从事岩石力学试验及边坡工程研究工作。

王文才(1964-),男,内蒙古伊金霍洛旗人,教授,博士生导师,从事采矿及矿山安全工程方面的教学和研究工作。

收稿日期: 2022-10-12

  修回日期: 2023-02-15

  网络出版日期: 2023-07-20

基金资助

国家自然科学基金项目“干燥多风矿区煤矸石山风压渗流及动态排矸自燃危险区判定”(52064043)

“矿井高效率通风机站结构及其通风性能的研究”(51764044)

“基于监测信息的露天矿边坡稳定性研究”(51464036)

Acoustic Emission Characteristics and Damage Evolution of Green Sandstone Under External Loads

  • Wencai WANG , 1 ,
  • Junpeng LI , 1, 2 ,
  • Chuangye WANG 1 ,
  • Shijiang CHEN 1 ,
  • Peng WANG 1
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  • 1. Institute of Mining and Coal, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
  • 2. School of Energy Industry, Shanxi Institute of Technology, Shuozhou 036000, Shanxi, China

Received date: 2022-10-12

  Revised date: 2023-02-15

  Online published: 2023-07-20

本文亮点

为分析青砂岩(QSY)在外荷载下的声发射特征及损伤演化规律,在声发射基础上,根据岩石损伤演化的自组织性、丛集行为及幂律分布特性,结合砂岩结构特征、分形理论和Weibull分布函数,建立了青砂岩损伤二维元胞模型。结果表明:青砂岩试样在荷载后期的塑性变形阶段轴向应力曲线发生线性突变是试样发生破坏的最终结果,破坏值为48.5 MPa,该阶段因微裂隙贯通形成大裂隙,存在事件率缺失现象,该现象为试样破坏前兆特征,破坏方式主要为单斜面和双斜面剪切破坏,形成剪切裂纹;试样受载损伤的3个阶段与AE信号表现特征存在类同,在损伤萌生阶段试样因受矿山生产影响内部存在微缺陷,在此阶段形成损伤演化现象,但间隔损伤值为0.41,未达到所建立元胞模型的不稳定损伤值(0.43),未发生破坏;随着损伤值增大至0.599时(大于0.43),试样发生失稳破坏,损伤值快速增长至1。根据岩石损伤演化相关规律和理论建立的二维元胞模型,能够反映青砂岩在外荷载下受力破坏过程和损伤演化规律,为相关研究提供参考和借鉴。

本文引用格式

王文才 , 李俊鹏 , 王创业 , 陈世江 , 王鹏 . 外荷载下青砂岩声发射特征及损伤演化规律[J]. 黄金科学技术, 2023 , 31(3) : 516 -530 . DOI: 10.11872/j.issn.1005-2518.2023.03.142

Highlights

As a micro-unit combination of geotechnical engineering, rock will be accompanied by complex AE signals and damage evolution characteristics during the loading process.In order to analyze the AE characteristics and damage evolution law of green sandstone under external load, a two-dimensional damage cell model of green sandstone was established based on acoustic emission,according to the self-organization, clustering behavior and power law distribution characteristics of rock damage evolution,combined with the structural characteristics of sandstone, fractal theory and Weibull distribution function.The results show that: The linear mutation of the axial stress curve of green sandstone sample in the plastic deformation stage at the late loading stage is the final result of the failure of the sample, and the failure value is 48.5 MPa. At this stage, large cracks are formed due to the combination of microcracks,resulting in the absence of event rate.This phenomenon is the precursor feature of the failure of the sample,and the main failure modes are single-bevel shear failure and double-bevel shear failure.The forming crack is shear crack.The three stages of loading damage of the sample are similar to the characteristics of AE signals.In the damage initiation stage, due to the internal microdefects of the sample affected by mine production, damage evolution will be formed at this stage, but the interval damage value is 0.41, which is lower than the unstable damage value of the established cellular model(0.43).No failure or instability failure occurs until the damage deformation stage.When the damage value increases to 0.599 (greater than 0.43), instability failure occurs in the sample, and the damage value rapidly increases to 1.Therefore, it can be concluded that the two-dimensional cellular model established by the relevant laws and theories of rock damage evolution can reflect the mechanical failure process and damage evolution law of bluestones under external loads, which can provide reference for related studies.

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自然资源部办公厅关于明确存量采矿用地复垦修复土地验收有关要求的通知

据7月16日报道,自然资源部办公厅印发《关于明确存量采矿用地复垦修复土地验收有关要求的通知》(以下简称《通知》),旨在落实《自然资源部关于做好采矿用地保障的通知》对采矿项目新增用地与复垦修复存量采矿用地相挂钩有关要求,规范存量采矿用地复垦修复土地验收工作。

《通知》明确,存量采矿用地分为义务人灭失的“历史遗留废弃采矿用地”和存在义务人并已办理建设用地审批手续的“企业存量采矿用地”。对于历史遗留废弃采矿用地,按照“谁实施、谁负责”原则;对于企业存量采矿用地,按照“边开采、边治理”原则,实施复垦修复。

《通知》强调,严把复垦修复质量关,特别要确保复垦修复形成的耕地及其他农用地质量达到土壤环境质量要求和相关安全利用标准。实施复垦修复项目,应对合法合规性进行审查,复垦修复项目实施前,应对存量采矿用地性质进行核实,并对复垦修复后地类、面积和质量进行核定。同时,加强复垦修复验收后跟踪管理,及时跟踪核实项目区地类变化情况,涉及农用地面积减少的,应及时整改;整改不到位的,不得使用腾退指标。

《通知》明确,存量采矿用地复垦修复土地验收,由项目承担单位或采矿企业提出申请,自然资源主管部门会同有关部门按照市县初验、省级终验的程序开展。涉及新增耕地拟用于占补平衡的,按照补充耕地验收有关要求同步开展补充耕地验收。

为保障存量采矿用地复垦修复全流程、可追溯管理,《通知》规定,在历史遗留废弃采矿用地项目批准后3个月内、企业存量采矿用地项目验收申请前、各类项目复垦修复竣工后、项目复垦修复验收时,均应通过全国存量采矿用地复垦修复验收信息系统完成相关信息填报。

《通知》要求,省级自然资源主管部门要推动建立统一、公开的存量采矿用地复垦修复土地腾退指标库和交易平台;市县自然资源主管部门要强化复垦修复的组织实施和全过程监管;有关支撑单位要做好服务保障工作。

脚注

http://www.goldsci.ac.cn/article/2023/1005-2518/1005-2518-2023-31-3-516.shtml

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