• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bulletin of engineering geology and the environment >Analysis on microseismic characteristics and stability of the access tunnel in the main powerhouse, Shuangjiangkou hydropower station, under high in situ stress
【24h】

Analysis on microseismic characteristics and stability of the access tunnel in the main powerhouse, Shuangjiangkou hydropower station, under high in situ stress

机译：双江口水电站主电站近期隧道微震特性及稳定性分析，高于原位应力

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Access tunnel in the main powerhouse of Shuangjiangkou hydropower station was deep buried with high in situ stress and complex geological conditions. Microseismic monitoring technology was established to monitor microcrack evolution process inside the surrounding rock in early excavation stage. Serious falling blocks in the left spandrel of the tunnel were predicted in a timely manner by delimiting major damage areas in the tunnel. Based on comparative analysis on microseismic activity law and field failure characteristics of the access tunnel, a quantitative index was supposed between slight rockburst like falling blocks and microseismic events. Moreover, the change law of daily average apparent stress difference and b value were analyzed based on microseismic event data. In addition, a three-dimensional numerical simulation software (RFPA3D) was used to simulate the damage distribution around the tunnel, and a relationship between spatial position of tunnel damage and direction of the maximum principal stress was qualitatively analyzed. The study results showed that advance speed of the tunnel working face was an important factor affecting the state of stress redistribution in surrounding rock mass, and the change law of b values of microseismic events could be used to predict activity state inside the surrounding rock effectively, which reflected mechanical properties and stress state of surrounding rock. In particular, field falling blocks became more serious with increasing b value, and field surrounding rock was relatively stable with minor b value. A risk of surrounding rock instability was relatively high with small b values. It provided an efficient method of predicting and assessing slight rockburst like falling blocks. The study results can provide significant guidance for field construction and later construction planning.
机译：双江口水电站主电力公路的进入隧道深埋高于原位应力和复杂的地质条件。建立微震监测技术，以监测早期挖掘阶段周围岩石内的微裂纹演化过程。通过划定隧道中的主要损伤区域，以及时的方式预测隧道左侧施警的严重下降块。基于接入隧道的微震活动法和田间故障特性的比较分析，假设数量指数在较小的岩体和微震事件中。此外，基于微震事件数据分析日平均表观应力差和B值的变化规律。此外，使用三维数值模拟软件（RFPA3D）来模拟隧道周围的损伤分布，并且定性地分析了隧道损伤的空间位置与最大主应力方向之间的关系。研究结果表明，隧道工作面的先进速度是影响周围岩体中应力再分布状态的重要因素，并且M微震事件的B值的变化规律可用于有效地预测周围岩石内的活动状态，其中岩岩的力学性能和应力状态。特别是，随着B值的增加，场下降块变得更加严重，并且围绕岩石的场地对轻微的B值相对稳定。周围岩石不稳定性的风险相对较高，B值小。它提供了一种有效的方法，可预测和评估像下降块的轻微摇滚乐。研究结果可以为现场建设和后来的施工规划提供重大指导。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号