| 张月征,纪洪广,侯昭飞,常量.二长花岗岩的声发射不可逆性试验研究[J].,2015,34(2):163-168 |
| 二长花岗岩的声发射不可逆性试验研究 |
| RESEARCH ON THE MONZONITIC GRANITE’S ACOUSTIC EMISSION IRREVERSIBILITY |
| 投稿时间：2014-07-14 修订日期：2015-02-16 |
| 中文摘要: |
| 本文借助声发射试验对岩石记忆应力或应变的能力(即岩石声发射的不可逆性)展开研究。试验以二长花岗岩为研究对象,采取三轴循环加卸载的力学试验方式,获取了岩石受力过程中的应力-应变曲线及声发射特征参数数据。试验数据分析表明：1. 在加卸载过程中,初始压密阶段、弹性阶段、塑性阶段、峰后阶段四个阶段声发射特征明显；同时在循环过程中Kaiser效应十分明显,在循环的卸载及再加载阶段(上一次峰值前)声发射信号微弱,在加载到上一次峰值之后才有明显的声发射信号产生。2.在较低应力水平阶段(相对应力低于63%),Kaiser 效应现象较为明显；在较高应力水平阶段(相对应力高于67%),Felicity 效应现象较为明显。3.由平均不可逆比值、不可逆比均差值、不可逆比偏差值三个比值综合比较分析可以得出,岩石试样对应变的记忆准确度要高于对应力的记忆准确度,岩石的物性参数(应变)记忆能力要明显好于状态参数(应力)。 |
| 英文摘要: |
| In this paper, with the help of acoustic emission experiments of rock stress or strain memory ability (i.e., irreversibility of rock acoustic emission). Take monzonitic granite as the research object, and take triaxial cyclic loading and unloading mechanical test ways, to obtain the the rock force of the process of stress-strain curves and acoustic emission characteristic parameter data. Experiment data analys is shows that:1.in the proces of loading and unloading, the four stages include of initial compaction phase、 elastic stage, plastic stage, peak after stage which have obvious acoustic emission characteristics;Kaiser effect is very obvious in the cycle, In cyclic unload and re-loading stage (before the last peak) acoustic emission signal is weak, the loaded into the last peak before anyone had obvious acoustic emission signal is generated.2. At lower stress level stage (relatively stress lower than 63%), Kaiser effect phenomenon is more obvious; At a high stress level stage (relatively stress is higher than 67%), Felicity effect is more obvious. 3. Irreversible by the average ratio, the irreversible than the average difference, the irreversible ratio deviation values of three comprehensive comparative analysis can be concluded that the rock specimen accuracy is higher than the memory of the strain accuracy on stress memory, and the physical parameters of the rock (strain) memory capacity is significantly better than the state parameters (stress)。 |
| DOI：10.11684/j.issn.1000-310X.2015.02.014 |
| 中文关键词: 声发射 Kaiser效应 不可逆性 不可逆比 |
| 英文关键词: Acoustic emission, Kaiser effect, irreversible, irreversible ratio |
| 基金项目:自然科学基金(项目编号：51174015)、国家重大基础研究项目(973计划)(项目编号：2010CB226803,2010CB731501)。 |
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