Volume 23 Issue 3
Jun.  2017
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CHEN Li-zhong, HONG Bo, ZHANG Quan-feng, et al., 2017. A STUDY ON IN-SITU STRESS MEASUREMENT IN A CANDIDATE SITE FOR CNNC NUCLEAR TECHNOLOGY INDUSTRIAL PARK IN GANSU PROVINCE. Journal of Geomechanics, 23 (3): 475-486.
Citation: CHEN Li-zhong, HONG Bo, ZHANG Quan-feng, et al., 2017. A STUDY ON IN-SITU STRESS MEASUREMENT IN A CANDIDATE SITE FOR CNNC NUCLEAR TECHNOLOGY INDUSTRIAL PARK IN GANSU PROVINCE. Journal of Geomechanics, 23 (3): 475-486.

A STUDY ON IN-SITU STRESS MEASUREMENT IN A CANDIDATE SITE FOR CNNC NUCLEAR TECHNOLOGY INDUSTRIAL PARK IN GANSU PROVINCE

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  • Received: 2017-01-10
  • Published: 2017-06-28
  • In order to more scientifically guide the site selection of CNNC nuclear technology industrial park, it is necessary to analyze the in situ stress state and the distribution law of the rock mass within the scope of the project area of the preselected site. Therefore, in-situ stress measurement was carried out by hydraulic fracturing in two 450 mdrilling in the project area, and 4 methods were used in the data processing stage to determine the instantaneous shut-in pressure to make sure the principal stress value reliable and accurate. The hydro-fracturing test results indicate that the maximum horizontal principal stress value is 6.66~25.91 MPa and the minimum is 3.94~15.76 MPa. The stress regime is SH > Sh > Sv, showing that the stress filed is dominated by the tectonic horizontal stress, and this kind of stress state is beneficial to reverse fault activities. The fracture impression test results show that the orientation of the principal horizontal stress in the project area is dominantly in the NE direction, which is in general agreement with that of regional tectonic stress field. Based on the measured data, the stress state parameters Kav, KHv, KHh, μm and τm were calculated, and the fault activity of the preselected site was analyzed using Coulomb friction sliding criterion, so as to synthetically evaluate the impact of the stress field characteristicsof the preselected site on the stability of rock mass engineering.

     

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