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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-2021-1923
... 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...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1822
...) to Portland Class A cement presents an increase in the potential bonding strength of the cement while significantly decreasing its overall fluid loss. The study herein investigates the effects of Bentonite NPs on the properties of Portland Class A cement. While rheological properties slightly changed...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1145
... strength gnirk experiment chisel dispersion drill bit geometry penetration percussive drilling curvature radius insert geometry reservoir characterization upstream oil & gas cone4 crater test machine conical insert ARMA 21 1145 On the influence of tool shape on percussive drilling...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1152
... ABSTRACT: Carbonate rock mechanical properties are important factors affecting the effect of acid fracturing, However, strength characteristics and deformation mechanism of tight carbonate rock under reservoir conditions are unclear currently. Triaxial compression experiment was conducted...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1159
... method of rock softening degree of shale hydration was put forward. The rock mechanical parameters and the dynamic change law of induced microfractures were analyzed. The results shown that shale hydration has an important influence on rock mechanical parameters, in which rock compressive strength, peak...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2141
... small size, large specific surface and good property of filling into the pores. The cement slurry with density 1.90 g/cm3 is taken as an example. The initial and final gel strength of cement slurry without liquid nano-silica are 1 Pa and 3 Pa respectively. The free fluid is 1.1 mL and the density...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2165
... wellbore integrity pore pressure structural geology strength geomechanics assessment complex reservoir upstream oil & gas depletion drilling campaign elastic property population reservoir zone north madura field mud weight window stress condition geomechanics model madura field north...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2001
... ABSTRACT: Underground stone mines in the United States generally use room-and-pillar mining method, and designing stable pillars, and knowing their behavior through the mine's life is of vital importance to avoid hazardous conditions. In the USA, empirical pillar strength equation and S-Pillar...

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