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Keywords: strength
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1130
..., then the uniaxial compressive tests were mimicked in this study. The results indicate that the peak strength of models decreases generally with the increase of fracture number, which is due to the growth of microcracks generated in fractures. The percentage of cracks formed in fractures increases regarding...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1060
... such as underwater tunnels, bridge piers and wharfs, therefore, the strength of the rock directly affects the stability and safety of the structures. Compared with the land blasting, the pressure duration of the shock wave of underwater blasting is shorter but the peak pressure is higher, which makes more damage...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1103
... of their ability to reproduce the geomechanical attributes (unconfined and confined) of a granitic rock. It was found that the elastic BBM with no provision for grain damage overpredicted the peak strengths for high confinement conditions. The introduction of inelasticity or explicit fractures within the blocks...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1120
... ABSTRACT: Researchers from the National Institute for Occupational Safety and Health (NIOSH) have been working on the development of an engineering-based rib control method through the numerical simulations with the developed coal mass model and strength reduction technique. This study focuses...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1666
.... Two cement formulations (with and without perlite particles) were prepared under high temperature and high pressure. The impacts of PP on the properties of well cement such as density variation, viscosity, gel strength, compressive strength, Young's modulus and permeability were examined. The results...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1688
... ABSTRACT: Studying the changes of deep mudstone strength properties after hydration are vital for the design of well drilling and proper choice of drilling fluid for deep wellbore stability. However, the previous methods (Coupled with conventional immersion test and compressive test...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1855
... angle by triaxial compression test of the mixture composed of clay and coarse sand. Savely et al. (1990) studied the effect of volume fraction of pebble gravel on shear strength through large-scale in-situ tests. wellbore integrity block content international journal wellbore design rock...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1923
... field (Type-III); Shear displacement along the joint (Type-IV). 1. Introduction The tunnel construction activity in a transversely isotropic rock mass always poses a real challenge to tunneling engineers due to its important features of strength and elastic anisotropy. The reponse of anisotropic...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1941
... contemporary civil engineering materials with advantages of abundant raw materials, low price, and simple preparing process. High-performance mortar has many applications on highways, bridges, and high-rise buildings due to its high structural strength and good durability. The compressive strength of high...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1227
... borehole diameter directional drilling strength original borehole size cavity accumulation wellbore upstream oil & gas horizontal section drilling operation casing shoe irregular wellbore expansion rate gas accumulation horizontal gas well diameter expansion rate wellbore gas...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1228
... to study the evolution of crack expansion under double-hole expansion-induced fracture hard rock body. Studies show that, firstly, the optimum water-cement ratio is 1:3, when expansive force is far greater than the tensile strength of rocks. Secondly, under double-hole expansion, the rock fractured along...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1231
... strength results was obtained from a deep-level gold mine in South Africa and factors causing this variation were determined. Factors such as tailings material properties, binder flow rate and curing affect the strength of backfill material. A strategy to maintain backfill strength consistency and improve...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1265
... ABSTRACT: Combined effect of specimen size and loading rate on the rock tensile strength was investigated in this work. The dynamic rock fracture and disintegration was simulated numerically using the 3D hybrid finite-discrete element computer code CA3. The rock under the impact loading...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1315
... characteristics, permeability evolution, and fracture stability on parameters dictating the strength of coupling between geomechanics, flow, and transport. 1. Introduction Applications of fluid injection into naturally or hydraulically fractured reservoirs are evident in many engineering disciplines: carbon...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1329
... ABSTRACT: Shale barriers are formed by shear creep closing an open annulus around a well. Such barriers are attractive options to prevent unintended flow along parts of the well where there is no cement between the casing and the formation. However, in many cases the strength and creep...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1371
... between the casing and the cement stone. Therefore, the cement stone between the isolation reservoir and the casing must have strong tensile and compressive strength, good fatigue resistance, and micro-expansion properties to cope with the generation of micro annulus. When cementing the target layer...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1749
... propagation during the fracturing test. Mechanical properties of tested rocks were obtained by conducting mechanical strength tests before fracturing tests. Siltstone exhibits brittle fracture characteristics during mechanical strength tests and fracturing test. Furthermore, SCDA generates the largest...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1780
... ABSTRACT: Experimental observations from the rock scratch test in sedimentary rocks present compelling evidence that the uniaxial compressive strength (UCS) can be estimated from the specific energy (SE). However, large variations of the SE/UCS ratio are also observed in various types of rocks...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1795
... of crushed rocks are commonly used raw materials for production of geopolymers. Geopolymerized mine tailings have a wide application in building and construction industry. The compressive strength of geopolymer was extensively studied by many researchers; however, the tensile strength remains largely...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1799
... ABSTRACT: This study combines novel and previously published data to create a new method of estimating anisotropic rock-mass strength in three dimensions that considers both the orientation and the non-persistence of multiple joint sets. Equations are developed to evaluate joint persistence...

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