Coarse-grained mixtures composed of coarse gravels and fine sands are widely used in subgrade constructions, which contain rubbles pebbles with different roundness (Rd). To investigate the effect gravel shapes on compaction behaviours subgrades, real-shaped particles varying Rd (0.2–0.5) were selected to establish coarse-grained models via discrete element method (DEM). The contact parameters DEM determined through a series calibration tests, reliability was verified by vibration tests...

Abstract This paper discusses the important need for creating voidage before carbon dioxide storage in saline aquifers. We show how within aquifer has potential to significantly increase overall capacity CO2 storage. demonstrate can help accommodating larger volumes of CO2, making process more efficient and effective. The includes results computations ensure sites do not add an environmental concern from high-pressure gradients that be generated without dewatering. In computational modeling...

Abstract The goal of the CO2 storage resources management system (SRMS) has been to provide a consistent approach for estimating storable quantities. This paper analyses major limitations PRMS (Petroleum Resources Management System) and its inapplicability SRMS that can be stored in geologic formation. In paper, we show how ignores fundamental aspect related reactivity with porous system. We analyzed various aspects reactions rock fluid. included chemical minerals. studied dissolution water...

Abstract Geothermal development involves harvesting the earth's natural heat. Early exploration involved multiple airborne & surface geophysical measurements. However, most successful technique has patterns of successively deeper boreholes, for monitoring stabilized subsurface temperature, with depth. While direct steam and flash projects have been developed in California, El Salvador, Iceland, Indonesia, Italy, Mexico, New Zealand, elsewhere, reservoir temperatures these sites greatly...

Volcanic cinder is a low-cost subgrade fill material in East Africa. A reluctance to use volcanic cinders for subgrades the past has stemmed from compactness substandard and variable. Considering irregular shape of cinders, can be improved by controlling particle shapes. The feature described macro-meso-microscopic scales through algorithms indexes, namely elongation (EI), roundness (Rd), roughness (Rg). indexes were calculated based on 2D contours 1000 particles, influences accumulation...

Fault gouge has special mechanical properties and remarkable engineering effects. Using a ring shear test, the strength of differently colored remolded fault gouges Shendaogou in Yan’an were studied by changing moisture contents normal stresses. Chlorite illite are main clay minerals gouges; differences mineral composition make appear different colors. Besides minerals, dried disintegration water is also due to transformation gypsum. The gradation green multicolor better than that red gouge,...

Abstract Among the complex issues associated with recovering extremely viscous oil (API < 5 degree) using CSS; we focus on two important factors. First is a feature of these reservoirs water lenses imbedded or overlain top column. Next issue optimum well completion method to uniformly deliver steam, enhance productivity and reduce steam requirements. The option CSS horizontal wells avoid lens effects compared that such deposits in vertical holes. We computed expected responses for...

On the mesoscopic scale, granular matter is tessellated into contact loops by a network. The stability of highly dependent on evolution loops, including number and area evolutions with different geometric shapes (which can reflect mechanical variables in macroscale). For features numerous complex geometry network images, loop recognition determination technique was developed this study. Then, numerical biaxial compression tests were performed discrete element method (DEM) to investigate how...

Coarse-grained soils, common fillers in subgrades, bear vibration loads the construction stage, compaction effects of which are affected by internal and external factors such as particle shapes frequencies. To enhance understanding performance, this study investigated vibration-induced deformation energy dissipation coarse-grained soils with two typical-shaped particles (pebbles rubbles) through tests different Results show that both resilience modulus damping ratio increase increasing...

Objective To reveal the etiology and patterns of occurrence intracerebral hemorrhage (ICH) provide basic data for prevention, treatment research ICH to reduce its incidence disability mortality rates. Methods A descriptive analysis was performed 207 cases treated in our hospital 2007 relation such factors as patients' age, gender, outcomes, seasonal distribution concurrent diseases. Results The patients consisted more male than female patients, with an average age at disease onset 58.4...

Summary In this paper, we build the orthotropic rock physics model for shale reservoirs, consider factors of clay lamination, kerogen horizontal fractures and vertical fractures, it’s based on effective medium theories including Backus average method( Backus, 1962 ), Anisotropic DEM model( Hornby, 1994 Schoenberg linear slip theory( Schoenberg, 1997 ). The study shows that there is a better fitting effect elastic parameters model. addition, can provide good anisotropic low frequency...

Summary In this paper, we mainly talk about orthotropic AVAZ inversion technique, it has proven to be important and effective for shale gas evaluation development. We use pre-stack predict elastic properties, is carried on azimuthal gathers with constrained wells. A slight modification was made the basis of Bachrach’s (2004) equation in order obtain parameters such as P-wave impedance, S-wave combinations anisotropic fracture orientation from inversion. This work could offer multiple that...