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贾哲强, 张茹, 张艳飞, 高明忠, 刘倩颖, 李安强, 谢晶. 猴子岩水电站地下厂房岩爆综合预测研究[J]. 岩土工程学报, 2016, 38(z2): 110-116. DOI: 10.11779/CJGE2016S2018
引用本文: 贾哲强, 张茹, 张艳飞, 高明忠, 刘倩颖, 李安强, 谢晶. 猴子岩水电站地下厂房岩爆综合预测研究[J]. 岩土工程学报, 2016, 38(z2): 110-116. DOI: 10.11779/CJGE2016S2018
JIA Zhe-qiang, ZHANG Ru, ZHANG Yan-fei, GAO Ming-zhong, LIU Qian-ying, LI An-qiang, XIE Jing. Integrated prediction for rockburst of underground powerhouse of Houziyan hydropower station[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(z2): 110-116. DOI: 10.11779/CJGE2016S2018
Citation: JIA Zhe-qiang, ZHANG Ru, ZHANG Yan-fei, GAO Ming-zhong, LIU Qian-ying, LI An-qiang, XIE Jing. Integrated prediction for rockburst of underground powerhouse of Houziyan hydropower station[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(z2): 110-116. DOI: 10.11779/CJGE2016S2018

猴子岩水电站地下厂房岩爆综合预测研究

Integrated prediction for rockburst of underground powerhouse of Houziyan hydropower station

  • 摘要: 中国西南地区在建的猴子岩水电站地下厂房,具有高边墙大跨度的特点。且位于高地应力区,实测最大主应力值高达36.43 MPa。地下厂房区域的灰岩坚硬完整、脆性程度高,具备高储能条件,在施工开挖扰动因素下有可能发生岩爆动力地质灾害。依照岩爆综合预测研究的思路,结合前期猴子岩水电站地下洞室群岩爆倾向性研究,开展岩爆趋势预测研究。建立三维有限元计算模型,根据实测地应力资料进行初始地应力场拟合,模拟猴子岩水电站地下洞室群分步开挖过程,选择王兰生二郎山隧道判据进行岩爆趋势预测。通过分析主厂房、主变室、尾调室三大洞室分步开挖过程中的岩爆趋势预测情况可知:猴子岩地下洞室群开挖过程中主要发生轻微岩爆,个别区域可能发生中等岩爆,与实际情况相比仍有一定差异。同时,归纳已有的多种岩爆预测判据,结合大量工程资料,对岩爆判据的适用性进行系统探讨。研究表明,单一判据在工程中有较大的局限性,预测结果与实际情况有较大偏差;而五因素综合判据则能较准确地反映工程的岩爆情况。

     

    Abstract: The underground powerhouse of Houziyan hydropower station under construction in southwest China has the characteristics of a large span and high sidewall. It lies in high geo-stress regions and its maximum measured geo-stress has reached to 36.43 MPa. The complete and hard limestone in this region has a high brittleness and provides a high energy storage condition, which is possible to result in dynamic geological disasters like rockburst because of the excavation disturbance. Based on the integrated prediction approach for rockburst, a research on rockburst tendency is conducted. Considering the strict simulation of topographical and geological conditions, a three-dimensional finite element model for Houziyan underground powerhouse is established. Then the step-by-step excavation process of underground powerhouse is simulated. And the initial geo-stress regression analysis is finished using method of back analysis. Wang Lansheng criterion is selected to evaluate the rockburst tendency. The rockburst tendency prediction of main powerhouse, main transformer chamber and tailrace surge chamber during step-by-step excavation process are analyzed. The results show that the light rockburst occurs during excavation of the underground caverns, and medium rockburst only happens in some areas. There are still some differences between the predicted results and the real situations. At the same time, a summary on various criteria of rockburst prediction and a discussion on the applicability of these criteria based on the existing engineering data are also carried out. It is indicated that there are some limitations using a single criterion to predict the actual projects. The predicted results by using five-factor rockburst criterion can reflect the actual situation more accurately.

     

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