作者：沈忠, 付小敏, 宾婷婷, 黄兴建

作者单位：成都理工大学 地质灾害防治与地质环境保护国家重点实验室, 四川 成都 610059

关键词：砂岩声发射;振铃计数;应力;应变;地质时期

摘要：

为研究地质时期对岩石损伤破坏的影响,在MTS815程控伺服刚性试验机上,对不同地质时期砂岩进行单轴压缩下的声发射试验。分析表明:随地质时期由旧到新,砂岩峰值强度处声发射振铃累计计数总量有明显降低的趋势;砂岩振铃计数突变点的累积突变量有上升的趋势;砂岩的破坏呈现越来越迟的特点。不同地质时期砂岩声发射振铃计数突变点处,累计突变量与振铃累计计数总量之比都保持在7.1%左右,此时应力与峰值强度之比都保持在60.0%左右,此时应变与破坏点处应变之比都保持在70.3%左右。据此,可为工程中岩体失稳与破坏的监测预报提供一定的理论基础与数据支撑。

Experimental study on acoustic emission characteristics of sandstones in different geological periods

SHEN Zhong, FU Xiaomin, BIN Tingting, HUANG Xingjian

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

Abstract: In order to study rock damage and fractures in different geological periods, the acoustic emissions in different geological periods are tested on a MTS815 programmable servo rigidity tester under uniaxial compression. The results indicate that, along with the geological periods developing from old to new, the total accumulative ringing counts of acoustic emissions show a declining tendency in the places of sandstone peak strength, while the accumulative saltation points of sandstone ringing counts are on the rise and sandstone destruction becomes increasingly slow. At the saltation points of sandstone ringing counts in different geological periods, the ratio of accumulative saltation numbers and total accumulative ringing counts stay at about 7.1%. At the same time, the ratio of stress and peak strength remains at around 60.0% and the ratio of strain and that at failure point keeps at 70.3% or so. Therefore, the above can be regarded as theoretical basis and date support for monitoring and forecasting the instability and destruction of rock masses in engineering.

Keywords: sandstone acoustic emission;ringing count;stress;strain;geological period

2016, 42(4): 9-14  收稿日期: 2015-09-13;收到修改稿日期: 2015-10-29

基金项目: 国家自然科学基金项目(41272321)

作者简介: 沈忠(1990-),男,湖北襄阳市人,硕士研究生,专业方向为岩土工程。

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