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

Abstract

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

CLC Number:

P542

LI Gong-Jian, WANG Qing-Fei, WANG Bi-Ren, LIU Xue-Fei, LIU Yan-Bing. Characteristics of ShangkouNankou Fault and Its Influence on Seepage Stability of Huyu Dam, Beijing[J]. Geoscience, 2010, 24(4): 727-734.

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