Advances in Earth Science ›› 2015, Vol. 30 ›› Issue (9): 915-921.

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Study on Distribution Rule of Geostress in Qinghai-Tibet Area

Zhimin Chen 1, 2, Songhong Yan 2, Dean Zhao 2, 3, Yunyan Yu 1, 2   

  1. 1. Key Laboratory of Road & Bridges and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China
    2. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
    3. School of Civil Engineering, Northwest University for Nationalities, Lanzhou, 730030, China
  • Online:2015-09-16 Published:2015-09-16

Zhimin Chen, Songhong Yan, Dean Zhao, Yunyan Yu. Study on Distribution Rule of Geostress in Qinghai-Tibet Area[J]. Advances in Earth Science, 2015, 30(9): 915-921.

The distribution curve of the Ratios of the Average Horizontal Geostress and the Vertical Geostresses(RAHVG) varying with depth and regression equation were obtained in Qinghai-Tibet area of China for the first time by collecting and analyzing 200 in-situ measured geostress results based on the analysis of distribution rule of geostress in China. Then the geostress distribution rule and the characteristics were analyzed, and it is found that the geostress in Qinghai-Tibet area conforms to the geostress distribution rule in China, but the geostress in Qinghai-Tibet area is significantly subjected to tectonic squeezing and the tectonic geostress is very obvious in magmatic rock. The RAHVG of the magmatic rock varying with depth in Qinghai-Tibet area is significantly greater than that in China between the depth of 100 m and 800 m. It shows that the stress of the magmatic rock in QinghaiTibet area is significantly subjected to squeezing tectonic. The RAHVG of the sedimentary rock varying with depth in Qinghai-Tibet area is basically consistent with that in China, but the value in Qinghai-Tibet area is greater. It shows that the stress of the sedimentary rock in Qinghai-Tibet area is not significantly subjected to squeezing tectonic. The RAHVG of the metamorphic rock varying with depth in Qinghai-Tibet area is significantly greater than that in China. It shows that the stress of the metamorphic rock in Qinghai-Tibet area is subjected to squeezing tectonic in some degree. This study can provide references to the study of distribution characteristics of geostress in Qinghai-Tibet area. It also has important practical value for underground engineering survey, design, structural analysis and construction in Qinghai-Tibet area.

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