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

CHEN Li-zhong; HONG Bo; ZHANG Quan-feng; ZENG Lian-bo; QIU Jun; LI Ran; DAI Jin-xiong

Volume 23 Issue 3

Jun. 2017

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Article Navigation > Journal of Geomechanics > 2017 > 23(3): 475-486

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.

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

CHEN Li-zhong^{1, 2, 3
,},
HONG Bo^{4
,
,},
ZHANG Quan-feng⁴,
ZENG Lian-bo¹,
QIU Jun^{2, 3},
LI Ran^{2, 3},
DAI Jin-xiong¹

1.
College of Geosciences, China University of Petroleum-Beijing, Beijing, 102249
2.
Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Land and Resources, Beijing, 100081
3.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081
4.
No. 247 brigade, Tianjin North China Geological Exploration Bureau, Tianjin, 301800

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Received: 2017-01-10
Published: 2017-06-28

Abstract

Abstract

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 S_H > S_h > S_v, 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 K_av, K_Hv, K_Hh, μ_m and τ_m 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.
- nuclear technology industrial park,
- hydraulic fracturing technique,
- in-situ stress measurement,
- stress state,
- engineering stability

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References(39)

References

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