The diffusivity equation for geopressure prediction using well logs

Manriquez, Alberto Lopez; Sepehrnoori, Kamy

doi:10.1016/j.petrol.2014.10.009

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…complex geomechanical environment, in which a thousand-meter-deep shaft was built, can cause the collapse, rock burst, and impact in the rock surrounding the shaft and the main roadway at the bottom of the shaft during shaft construction. Given the problems of rock mechanics and disaster control in deep mine shaft construction [10][11][12], many scholars have studied the basic theory of mechanics in this type of construction. Wang Jinping [13] simplified the vertical shaft as a thick-walled cylinder.…”

Section: Introductionmentioning

confidence: 99%

A Primary Support Design for Deep Shaft Construction Based on the Mechanism of Advanced Sequential Geopressure Release

et al. 2022

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The construction of 1500 m depth shaft in Xincheng Gold Mine, China, faces complex stress conditions such as high geostress (>50 MPa), high ground temperature (>50 °C), high water-pressure (>9 MPa), and highly corrosive. Traditional deep shafts excavated by the sinking and lining method cannot adapt to high geostress problems, such as rock bursts and large deformations, etc., in the deep shaft construction process. To avoid and adjust the high geostress induced the rockburst and large deformations, the mechanism of the advanced sequential geopressure release (ASGR) has been proposed for the ground control in deep shaft construction. In this paper, the safe distance between the concrete lining and the shaft excavation face is determined based on the ASGR mechanism, which can provide the space for geopressure release, and primary support based on rock mass quality and numerical simulation was employed to control the geopressure and deformation. A new support scheme for the deep shaft is proposed, using long bolts to restrain severe deformations, metal mesh, and a double reinforcement bar to improve the induced stress distribution. According to the results, the construction scheme of deep shaft has been improved, and the safe support distance of the proposed scheme is determined to be 12 m, with an interval of three excavation cycles. Compared to the original scheme of shaft lining after excavation, the proposed scheme based on the ASGR mechanism can effectively improve the geopressure release and benefit from controlling the rockburst and large deformation of deep shaft induced by high geostress conditions. The stress distribution in the lining is more uniform, and safety factor of the lining is increased to 2.0, which is benefit the long-term stability of deep shaft.

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Section: Introductionmentioning

confidence: 99%