Experience with hydrofracture stress measurements to depths of 2.6 km and implications for measurements to 6 km in the Carnmenellis granite

Pine, R.J.; Kwakwa, K.A.

doi:10.1016/0148-9062(89)91436-8

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Location and Depth Range (M)1

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1997

2023

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Cited by 8 publications

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“…Martin and Chandler (1993) reported a 90° rotation of the maximum in situ stress component across fault zone no. On the other hand, Pine and Kwakwa (1989) found a relatively consistent orientation of the principal stresses measured by hydraulic fracturing at depths up to 2.6 km in the Carnmenellis granite in Cornwall, England. This large rotation was attributed in part to stress release associated with slip along the fault.…”

Section: Location and Depth Range (M)mentioning

confidence: 73%

Estimating in situ Stresses

Amadei

Stephansson

1997

Rock Stress and Its Measurement

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Several of these different phenomena are discussed in this chapter. The reader should be aware that no agreement has yet been reached with certainty on this matter and that there is still room for discussion. VARIATION OF INSITU STRESSES WITH DEPTH Several authors have proposed expressions for the variation of the magnitude of the vertical and horizontal in situ stresses with depth at specific sites or for different regions of the world. Most data are for depths of less than 3000 m. Examples of stress profiles and stress variations with depth can be found in Hast

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Section: Location and Depth Range (M)mentioning

confidence: 73%