... ABSTRACT Over the past decades, many pillar strength relationships have been formulated from empirical observation of stable and failed case histories. These empirically derived equations are still widely adopted as a general technique for estimating pillar strength and simplified methods...

... ABSTRACT Pillars have a central role in an active stress management approach, which has been proposed for the extraction of thick tabular and massive hard-rock mineral deposits. A mining method making use of this approach, is the novel raise caving mining method. Initially, the pillars have...

... united states government geological subdiscipline equation metals & mining effective stress power law application geology reservoir characterization salt-pillar equation stress condition group pillar analysis average effective stress geologist reservoir geomechanics pillar...

... mathematics of computing pillar geomechanics platinum mining africa government metals & mining geologist united states government reservoir geomechanics geology modeling & simulation map3d extraction ratio layout coates zvarivadza page equation different depth...

... geometry (pillars, abutments, and back-areas); while 24% were located near known geological structures (faults, dykes). INTRODUCTION As the depth of underground mining increases, the stresses in the rock mass increase, and as a result, the level of induced seismicity usually increases. Mine seismicity...

... ABSTRACT Underground stone or hard rock mines typically employ the room-and-pillar mining method. Room-and-pillar mines are designed in traditional patterns with square or rectangular shaped pillars. This method is favorable because the symmetric pattern aids in optimizing mining operations...

... of the roof and floor, and the plastic zone distribution. We find that the shallow-hole room-pillar method with anchor roof protection has poor pillar stability, while the filling method is more stable, lastly. Our results offer valuable insights into efficient phosphate ore mining practices and provide...

...ARMA 23 0292 The Geotechnical Aspects of a Pillar Recovery Project in the DOZ Cave Mine Putra, F., Meiharriko, Hasan, R., and Hamman, J.P.E. PT Freeport Indonesia, Papua, Indonesia Copyright 2023 ARMA, American Rock Mechanics Association This paper was prepared for presentation at the 57th US Rock...

... and sequestration. annular pressure drilling consideration wellbore drilling fluids and materials well control assessment upstream oil & gas well planning threat reactivation drilling operation drilling fluid management & disposal threshold pillar evaluation geomechanics symposium...

... karst cavities. The interaction of these cavities with the extensive presence of discontinuities is the major cause of ground control problems encountered during stone mining operations. This paper presents a case study for analyzing the effect of the karst cavity on the strength of a pillar...

... ABSTRACT: Shale gas wells in longwall abutment pillars are subjected to longwall-induced ground movements, and their stability has been a safety concern for both the mining and gas industries. To understand the impact of longwall mining on the stability of gas wells in longwall abutment...

... is used for numerical calculation. According to the influence laws of the plastic zone, the maximum displacement around the cavern, equivalent strain and volume shrinkage rate, the stability of the salt cavern gas storage when the wells are arranged in a triangle pattern is analyzed. And the pillar width...

... metals & mining esterhuizen proceedings element size boundary element modeling samuel escobar stone pillar width-to-height ratio cell element reservoir characterization pillar strength pillar concentric ring zone capacity pillar upstream oil & gas strength strength equation...

... ABSTRACT: Time-dependent deformation occurs in rock pillars, and it affects the stability of the pillars and excavations. In this paper, time-dependent deformation behaviors of brittle rock pillars are studied using a grain-based time-to-failure model (GBM-TtoF). First, time-dependent...

... ABSTRACT: Gas wells drilled through coal seams may be influenced by underground coal mining, especially longwall mining. To evaluate the stability of gas wells in longwall chain pillars, NIOSH has developed numerical models to calculate longwall-induced ground pressure, subsurface movements...

... development. Literature suggests that the pillar structures in underground mines can also be regarded as support structures and their reaction to tributary and additional (abutment) stress can be viewed with respect to the ground reaction curve at the pillar location. This paper presents a series of 2D and 3D...

... Abstract This paper investigates the applicability and operational characteristics of different partial pillar extraction methods for a room-and-pillar coal mining project located in the region of southern Africa. Three partial pillar extraction methods, i.e. the Pillar Splitting method...

... extreme value distribution reservoir geomechanics Rock mechanics cohesion random model Upstream Oil & Gas correlation contour stability rock mass spatial correlation stochastic model Symposium spatial variance deterministic model pillar 1. INTRODUCTION Rock is heterogeneous...

... Upstream Oil & Gas shale pillar fracture Rock mechanics geomechanics Symposium void 1. INTRODUCTION To establish and maintain well integrity to avoid leakage through wells is vital for production wells relevant for the petroleum industry, and for injection wells used for CO2 sequestration...

... ABSTRACT: . In the process of fracturing production, it is necessary for us to predict fracture conductivity in channel fracturing to gain optimized construction parameter, improve oil and gas production. However, due to the non-linear deformation of the proppant pillar after high pressure...