岩质边坡微震事件b值特征研究

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摘要研究分析锦屏一级水电站左岸边坡微震震级–频率关系及其对应b值变化规律。为评价左岸边坡整体稳定性以及强卸荷岩体损伤诱发的边坡局部潜在失稳风险，在已有多点位移计、石墨杆收敛计等常规监测仪器基础上，2009年左岸边坡成功安装运行微震监测系统。监测期内采集分析得到大量微震事件及其震源参数信息如震级、位置和时间，通过分析2009年6月至2011年5月之间微震数据，初步识别和圈定边坡深部岩体损伤区域，同时得到微震事件b值随时间变化规律。结果表明左岸边坡岩体损伤与b值存在一定关系：大坝拱肩槽周围微震事件b值等于0.87，说明微震活动性对岩质边坡稳定性影响较小；左岸边坡未知地质构造微震活动性b值小幅增大(从0.49到0.65)表明该未知地质构造岩体损伤或局部破坏风险不断降低。研究结果可为类似岩质边坡微震监测预报技术的应用提供参考，进而提高岩体稳定性监测的准确性。

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关键词 ：边坡工程, 岩质边坡, 微震监测, b值, 锦屏一级水电站, 预测

Abstract：The magnitude-frequency relation(b value) of microseismic events recorded at the left bank slope of Jinping first stage hydropower station was analyzed. In order to in-depth investigate the slope stability and resolve the complex surface conditions of highly fractured rock mass，a microseismic monitoring system was implemented at the rock slope in June 2009 based on common monitoring instrument including multipoint extensometer and graphite rod convergence gauge. Seismic source parameters such as magnitude，location and time were captured during the monitoring period. The variation of b value was thus determined with time and excavation-induced microcrackings were identified and delineated after analyzing the monitoring data recorded from June 2009 and to 2011. Results show that rock mass damage is closely related with b value. The b value of microseismic events at the dam spandrel equals 0.87，showing the microseismicity plays little effect on the rock slope stability. Meanwhile，the little increase of b value(from 0.49 to 0.65) at the unknown geological structure indicated the hazard probability of rock mass failure inside the unknown geological structure of left slope decreased. Results can provide references for predicting rock mass instability and improving monitoring accuracy in similar rock slopes.

Key words： slope engineering rock slope microseismic monitoring b value Jinping I hydropower station prediction

收稿日期: 2013-04-26

引用本文:

徐奴文1，2，戴峰1，周钟3，沙椿3，唐春安4. 岩质边坡微震事件b值特征研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3368-3374.
XU Nuwen1，2，DAI Feng1，ZHOU Zhong3，SHA Chun3，TANG Chun?an4. STUDY OF CHARACTERISTICS OF b VALUE FOR MICROSEISMIC EVENTS IN HIGH ROCK SLOPE. , 2014, 33(sl): 3368-3374.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3368

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