摘要
利用RLW-3000伺服压力试验机和PCI-Ⅱ声发射三维定位实时监测系统对以研山铁矿东帮砂砾卵石制作的不同含水率的帷幕体试块进行单轴压缩条件下的声发射(AE)测试,并结合声发射空间定位、AE撞击计数率对不同应力阶段帷幕体裂隙空间演化规律进行了分析。试验结果表明:帷幕体声发射事件空间定位在试块中分成上下2部分。在帷幕体的初始加载阶段,声发射事件定位位置为试块内部的应力集中位置;随着荷载的不断加大,声发射事件逐渐由区域中心向外扩散。声发射波的传播受水的影响,在养护条件下的帷幕体的声发射事件数最多,干燥条件下帷幕体的声发射事件数最少。随着含水率的增加,撞击计数率峰值出现得更早。研究结果对帷幕注浆破裂失稳机理研究有一定的意义,也可以为工程岩体稳定性提供理论依据。
Uniaxial compression tests on curtain block of different moisture content which made of sand and gravel that taken from the east slope of Yanshan iron ore were carried out using RLW-3000 servo press testing system. And the acoustic emission （AE） activities were monitored by PCI-II AE system during the whole experimental process. According to the AE location and the AE hit count rate,the fissure space evolution regular of curtain block with different stress stage is analyzed. The experimental results indicate that the curtain body of AE event in space positioning block is divided into two areas. In the initial loading stage of the curtain body, the AE location is located in the interior of the curtain block where the position of stress con- centration. With the load increasing, the AE event gradually spreads outwards from the center of each area. Because of the prop- agation of AE wave affected by water, so that the number of AE events of curtain body in curing condition are the most, and the number of AE events of curtain body in dry condition at least. With the increase of moisture content, AE hit count rate peak emerged earlier. The research results of the research on the rupture and instability mechanism of curtain grouting have certain significance, and also provide a theoretical basis for the stability of engineering rock mass.
出处
《金属矿山》
CAS
北大核心
2016年第2期36-41,共6页
Metal Mine
基金
河北省自然科学基金项目(编号:E2015209260)
唐山市科技计划项目(编号:13130239z)
关键词
声发射
撞击计数率
帷幕体
空间定位
裂隙演化
Acoustic emission, Hit count rate, Curtain body, Spatial orientation, Fracture evolution
