Analyses of disking phenomenon and stress field in the region of an underground powerhouse
- 113 Downloads
The large underground power chambers of Ertan Hydropower Station will be built near the abutment on the left bank in a region with high initial stresses. In this paper, a statistical analysis is presented for the phenomenon of core disking in the dam site. On the basis of a number of stress measurements, the region of the river valley could be divided into three different geostress zones. It is shown that there exists a rather high horizontal stress of up to 30 MPa, and even over 60 MPa at the bottom of the river bed. A least square method has been introduced to get a continuous field of stress, which approximates the variable measured stress data.
KeywordsCivil Engineer Stress Field River Valley Initial Stress Measured Stress
Unable to display preview. Download preview PDF.
- Bai, S., Li, G. (1982): Stress Measurement of Rock Mass in Situ and the Law of Stress Distribution in a Large Dam Site. Issues in Rock Mechanics, 23rd Symp. on Rock Mechanics, U. S. A.Google Scholar
- Bai, S., Zhu, W., Wang, K. (1983): Some Rock Mechanics Problems Related to a Large Underground Power Station in a Region with High Rock Stresses. Proc., 5th Int. Congress on Rock Mechanics, Melbourne. D. 271, Australia.Google Scholar
- Durelli, A. J., Obert, L., Parks, V. J. (1968): Stress Required to Initiate Core Disking. Trans SME, Vol. 241. Sept.Google Scholar
- Hast, N. (1967): The State of Stresses in the Upper Parts of the Earth's Crust. Engineering Geology,4 (no. 1).Google Scholar
- Leeman, E. R. (1966): The Determination of the Complete State of Stress in Rock in a Single Borehole-Laboratory and Underground Measurements. C. S. I. R., Report. 538. Pretoria, South Africa.Google Scholar
- Obert, L., Stephenson, D. E. (1965): Stress Conditions Under which Core Disking Occurs. Trans. SME, Vol. 232. Sept.Google Scholar
- Shi, J. (1979): Brittle Fracture of Rock at High Stress Region. Interior Report of Inst. of Power Survey and Design, Chengdu.Google Scholar
- Stacey, T. R. (1982): Contribution to the Mechanism of Core Disking. J. S. Afr. Inst. Min. Metall.82 (no. 9).Google Scholar
- Sugawara, K., Kameoka, Y., Saito, T., Oka, Y., Hiramatsu, Y. (1978): A Study on Core Discing of Rock. J. Min. Inst. of Japan94, 1089 (78-11).Google Scholar
- Zhu, W., Wang, K., Peng, G. (1984): The Stability of Underground Power Chambers in Brittle Rock. Int. Conf. Case Histores in Geotechnical Engineering. St. Louis, MO, U. S. A.Google Scholar