北京南口地区构造特征与虎峪水坝渗流稳定性分析
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摘要
南口地区地处军都山隆起与京西丘陵平原区的过渡部位。系统的野外调查、地形地貌解析、节理统计分析,结合基岩样品显微组构研究表明,区内上口—南口断裂总体表现为正断性质,自燕山早期形成以来,其经历了由压性转变为张性的力学过程,南口地区主应力σ1在侏罗纪为NW—SE向,早白垩世以来为NEE—SWW向。上口—南口断裂最晚活动时期为晚更新世晚期,库区构造背景较不稳定。虎峪水库现今储水不满,下游地下潜流发育,是由于基岩中密集发育的节理渗流而引起的,且主要受控于早期区域NW—SE向挤压运动产生的顺河流走向节理。为了提高水库储水能力,建议对其进行防渗加固处理。
Nankou is located in the transition region between Jundushan uplift and the hill-plain area of western Beijing.The systematic field-investigation,terrain analysis,statistical analysis of joints and microscopic structure studies of bedrock are applied in our works.It is suggested that the overall performance of Shangkou-Nankou fault is normal,it experienced mechanical process from compression into tension after it had originated in Early Yanshanian,while the corresponding principal stress σ1 in Jurassic is NW-SE and it translated into NEE-SWW from Early Cretaceous.The latest active period of Shangkou-Nankou fault is Late Pleistocene,and the modern crustal movement of the reservoir area is less stable.The intensive joints in bedrock are the dominant factors for dam seepage and the most effective joints which approximately parallel to the river toward are controlled by early NW-SE compression.A stabilization works should be carried out in order to improve storage capacity of the reservoir.
Nankou is located in the transition region between Jundushan uplift and the hill-plain area of western Beijing.The systematic field-investigation,terrain analysis,statistical analysis of joints and microscopic structure studies of bedrock are applied in our works.It is suggested that the overall performance of Shangkou-Nankou fault is normal,it experienced mechanical process from compression into tension after it had originated in Early Yanshanian,while the corresponding principal stress σ1 in Jurassic is NW-SE and it translated into NEE-SWW from Early Cretaceous.The latest active period of Shangkou-Nankou fault is Late Pleistocene,and the modern crustal movement of the reservoir area is less stable.The intensive joints in bedrock are the dominant factors for dam seepage and the most effective joints which approximately parallel to the river toward are controlled by early NW-SE compression.A stabilization works should be carried out in order to improve storage capacity of the reservoir.
引文
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[30]陈虹,胡健民,武国利.韧性剪切带糜棱岩中不对称旋转碎斑系剪切指向模拟实验研究现状及其问题[J].地质通报,2009,28(4):439-455.
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[34]Amy E W,Terry E.Characterizing stress fields in the upper crustusing joint orientation distributions[J].Journal of Structural Ge-ology,2005,27:1778-1787.
[35]周坤,张宏颖.白乃庙金矿区节理组合分析[J].地质与资源,2006,15(1):48-52.
[36]朱志澄,韦必则,张旺生,等.构造地质学[M].武汉:中国地质大学出版社,2006:97-100.
[37]陈正邦.北京地区的构造地质研究进展[J].北京地质,1994(2):29-32.
[38]宋鸿林.燕山式板内造山带基本特征与动力学探讨[J].地学前缘,1999,6(4):309-316.
[39]张长厚,张勇,李海龙,等.燕山西段及北京西山晚中生代逆冲构造格局及其地质意义[J].地学前缘,2006,13(2):165-183.
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