循环载荷下胶结充填体损伤声发射表征

doi:10.11872/j.issn.1005-2518.2018.06.819

摘要/Abstract

摘要：

胶结充填体是充填采矿法应用的关键部分，其稳定与否是充填采矿成功实施的基础和前提。实际采矿活动对充填体产生一种循环重复的加卸载扰动，通过研究循环加卸载作用下充填体损伤破坏过程的声发射特征，探求充填体的损伤演化机理，可为充填体声发射监测技术提供基础性依据。本研究利用RMT-150C电液伺服系统和PIC-2型USB数字多通道声发射仪对灰砂比为1∶4的4组试样进行多级加卸载试验，模拟充填体实际所处应力环境。通过对试验过程系统接收到的声发射信号分析处理后，发现了循环载荷下胶结充填体的损伤演化具有3个不同阶段特征；同时用经过声发射参数量化后的损伤值表征充填体的损伤，为充填体稳定性监测技术的建立提供数值依据。

关键词: 循环载荷, 胶结充填体, 声发射, 损伤表征, 凯塞效应

Abstract:

Cemented filling body is the key part of filling mining application,and its stability is the basis and premise for sucessful implementation of filling mining.The actual mining activities can produce a repetitive loading and unloading disturbance on the filling body.By studying the acoustic emission characteristics of the backfill damage and failure process under the action of cyclic loading and unloading,the damage evolution mechanism of the filling body can be explored, which can provide the basis for the acoustic emission monitoring technology of backfill.To simulate this stress environment,the RMT-150c electro-hydraulic servo system and the PIC-2 USB digital multi-channel acoustic emission instrument were used to perform multi-stage loading and unloading experiment with 4 sets of samples of cement sand ratio 1 $∶$ 4.By analyzing the acoustic emission signal received from the experimental process system,it is found that the damage evolution of cemented backfill under cyclic loading has three different stage characteristics.The damage of filling body is characterized by the quantified damage of acoustic emission parameters, which provides a numerical basis for the establishment of filling body’s stability monitoring technology.

Key words: cyclic loading, cemented filling, acoustic emission, damage representation, Kaiser effect

中图分类号:

TD853.34

叶永飞,张雅楠,李士超,曹世荣,韩建文,王晓军. 循环载荷下胶结充填体损伤声发射表征[J]. 黄金科学技术, 2018, 26(6): 819-825.

Yongfei YE,Yanan ZHANG,Shichao LI,Shirong CAO,Jianwen HAN,Xiaojun WANG. Acoustic Emission Characterization of Damage of Cemented Filling Under Cyclic Loading[J]. Gold Science and Technology, 2018, 26(6): 819-825.

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