欢迎访问现代地质!

现代地质 ›› 2010, Vol. 24 ›› Issue (4): 727-734.

• 构造地质 • 上一篇    下一篇

北京南口地区构造特征与虎峪水坝渗流稳定性分析

李龚健1, 2 ,王庆飞1, 2 ,王必任2 ,刘学飞1, 2,刘彦兵2   

  1. 1.地质过程与矿产资源国家重点实验室,中国地质大学 地球科学与资源学院,北京100083;
    2.中国地质大学 岩石圈构造、深部过程及探测技术教育部重点实验室,北京100083
  • 出版日期:2010-07-23 发布日期:2010-09-05
  • 作者简介:李龚健,男,硕士研究生,1986年出生,矿床学专业,主要从事矿田构造学研究。Email:ligongjian@126.com。
  • 基金资助:

    教育部高等学校学科创新引智计划(“111”)项目(B07011);教育部长江学者和创新研究团队项目(IRT0755)。

Characteristics of ShangkouNankou Fault and Its Influence on Seepage Stability of Huyu Dam, Beijing

 LI  Gong-Jian1, 2, WANG  Qing-Fe1, 2, WANG  Bi-Ren2, LIU  Xue-Fei1, 2, LIU  Yan-Bing2   

  1. 1.State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources,China University of
    Geosciences,Beijing100083, China;       2.Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of
    Ministry of Education, China University of Geosciences, Beijing100083, China
  • Online:2010-07-23 Published:2010-09-05

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。

关键词: 上口&mdash, 南口断裂;虎峪水库;水坝稳定性;构造应力场;节理组合

Abstract:

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.

Key words: Shangkou-Nankou fault, Huyu reservoir, dam stability, tectonic stress field, joint combination

中图分类号: