GEOGRAPHICAL RESEARCH ›› 1997, Vol. 16 ›› Issue (4): 15-22.doi: 10.11821/yj1997040003

Previous Articles     Next Articles

NEOTECTONIC STRESE FIELD AND ITS EFFECTS ONTHE DOMINANT SLIDING DIRECTION OF LANDSLIDES IN THE THREE GORGES RESERVOIR REGION

Chen Hongkai1, Tang Hongmei1, Ai Nanshan2   

  1. 1. Inst. of Geotechnical Engng, Chongqing Jiaotong College, Chongqing 630074;
    2. Sichuan Union University, Chengdu 610064
  • Received:1996-11-11 Revised:1997-01-17 Online:1997-12-15 Published:1997-12-15

Abstract: Neoteconic stress field (NSF), as one geologic agent, plays an important role in zonal slope stability analysis and soil erosion researches. NSF in the Three Gorges reservoir is presented by the Scheidegger method, one of geomorphologic method to identify NSF, in this paper. Principal compressive NSF go in the directions of NE52.1°, NE12.5°and NE45°respectively in the Chongqing area, the reservoir of east Sichuan and the Three Gorges area in the reservoir region, which control obviously the sliding directions of landslides along the banks of the reservoir. Sliding directions of landslides principally tally with the shear belt (Max1) of the NSF region of the reservoir, which is NE52.1° Then we discover that the dominant slide direction of landslides in the area tallies with the shear zone of NSF. Due to the acute angle between the principal compressive stress of the NSF and the Yangtze River valley is about 55°, tectonic stress OT- mainly plays roles of O3- of the reservoir slope, which can trigger landslides easily.

Key words: Three Gorges reservoir, neotectonic stress field (NSF), geomorphologic method-Scheidegger-method, dominant slide direction of landslide

PACS: 

  • P546