R.J. Pine

TL;DR: In this paper, it was concluded that the continued downward growth of the stimulated region was associated with a shearing source mechanism, and the existence of the downward growth implies an eventual curvature in the maximum stress envelope if shear failures are not to be incipient under hydrostatic pore pressure conditions.

TL;DR: In this paper, a two-dimensional numerical model of coupled fluid flow, heat transfer and rock mechanics in naturally fractured rock is developed, which is applicable to assessments of hot dry rock (HDR) geothermal reservoir characterisation experiments.

TL;DR: In this paper, a program of over-coring rock stress measurement was conducted at South Crofty mine, Camborne, at a depth of 790 m in the Carmenellis granite to obtain information required for the Camborne School of Mines (CSM) hot dry rock (HDR) Geothermal Energy Research Programme at Rosemanowes quary in Cornwall, U.K. The measurements were undertaken to obtain an independent confirmation of stress magnitudes measured by hydraulic fracturing at the quarry and an indication of stress directions.

TL;DR: In this article, a strain stiffening constitutive law for the goaf has been proposed for long-wall mining, with a strain-stiffened constitutive Law for the whole goaf, loaded by overlying strata.

TL;DR: In this article, the development of HDR reservoirs in the Carnmenellis granite has involved HFSM to depths of up to 2.6 km in several test series and the results of these and other stress measurements, and the operational experience gained, are reviewed in terms of proposed developments at 6 km.