TL;DR: In this paper , the authors investigated the thermal performance of energy piled walls, specifically regarding the effect of thermoactive pile spacing, and found that activating every other pile (1/2 of the total number of piles) or every other second pile ( 1/3 of them) can still provide over 70% or 50% of the maximum thermal energy compared to activating every pile.

TL;DR: In this article , the fractal dimension of the mesoscopic structure of the rock fracture tends to increase with an increase in the loading rate, and demonstrates a good positive relationship by fitting with the macrostructure fractal dimensions.

TL;DR: In this paper , the authors investigated the heat exchange potential of energy tunnels for a broad range of internal airflow characteristics and concluded that the internal airflow characteristics significantly influence the harvesting of aerothermal energy through energy tunnels.

TL;DR: In this article , the authors combined experimental analysis and numerical modeling to assess micro-annuli development at casing-cement interfaces, and found that once a microannulus forms, it remains open at internal casing pressures as high as 40 MPa.

TL;DR: In this article , a static 3D geomechanical model was developed to predict the spatially continuous distribution of undisturbed in situ stress state and evaluate the reactivation risk of major fault zones.

TL;DR: In this article , the authors investigated the fracture initiation pressure and resultant fracture networks in different rock fabrics, including rock heterogeneities in lamination and mineralogy, rock brittleness, the type of fracturing fluids, and various confinement conditions.

TL;DR: In this paper, the authors combined experimental analysis and numerical modeling to assess micro-annuli development at casing-cement interfaces, and found that once a microannulus forms, it remains open at internal casing pressures as high as 40 MPa.

TL;DR: In this article , the influence of coal reservoir formation processes on fissure-pore structure parameters of coal has been investigated in four main mining areas in China: Daliuta mine, Xinglongzhuang mine, Qingdong mine and Qincheng mine.

TL;DR: In this article , a parametric study is carried out by means of numerical Finite Element simulations complemented by statistical analysis, aimed at identifying the dominant parameters in maximizing energy micro-piles thermal efficiency.

TL;DR: In this article , the authors present a multidisciplinary interpretation including geological characterisation, geodetic and geotechnical measurements, numerical modelling and visualisation techniques, which provides a valuable basis for the rating of the impact of geologic structures, material heterogeneities, and climatic conditions on the Opalinus Clay.

TL;DR: In this paper , a random angular bend (RAB) algorithm and overlap detection algorithm are used to simulate sandstone with irregularly shaped mineral particles and the development of crack was obtained and used to evaluate the damage characteristic of sandstone during heating process.

TL;DR: In this paper , the role of intermediate fracture angles was investigated for intersecting fracture angles, which have been identified to occur most frequently when the new hydraulic fractures intercept the existing ones.

TL;DR: In this paper , a coupled flow-geomechanics model was built to investigate time-lapse geomechanical responses in production before infill well placement of Sichuan Basin shale gas reservoir.

TL;DR: In this paper , a well called Well-A in an Iranian southwest oil field was analyzed using an elastic or a plastic solution, and the numerical solutions using a finite difference code were applied to determine the optimum mud weight and evaluate the results of analytical computations.

TL;DR: In this paper , a series of tests were conducted to study the thermal shock damage effect on the physical and mechanical properties of granite and limestone in different cooling media, such as air, water, and high-viscosity liquid.

TL;DR: In this paper , the use of enzymatic induced carbonate precipitation (EICP) treatment for erodibility improvement, scour mitigation, and water infiltration capacity of beach sand at one, two, and three cycles of treatment was evaluated.

TL;DR: Wang et al. as discussed by the authors investigated gas extraction efficiency using in-seam borehole method considering influence of drilling/excavation induced plastic zone, and the calculated radius of the plastic zone was compared with the analytical results.

TL;DR: In this paper , a new hysteretic hydraulic constitutive model for the water retention and hydraulic conductivity behavior of unsaturated soils is presented, which is effective and easy to apply.

TL;DR: In this article , different particle removal methods and their impact on the mechanical behavior of eroded samples were studied. But the results were limited to the case where the fine particles had a small contribution in carrying stresses when fc≤30%.

TL;DR: In this article , a power law was proposed to describe the development of suffusion based on the energy approach, and the power law requires three material parameters: the erosion resistance index and the maximum volumetric cumulative energy that both characterize the fully eroded state; and a smoothing time that controls the suffusion kinetics.

TL;DR: In this article , an injection test and repeated packer tests were conducted for a fault in siliceous mudstone in order to activate the fault and investigate changes in hydraulic connectivity of the fault before and after fault activation.

TL;DR: In this article , the authors investigated the impact of initial mean effective stress on the thermo-mechanical behavior of saturated normally consolidated kaolinite clay and found that the magnitude of thermal volumetric strain increased with increasing initial ME stress, which is a departure from expected trends from established constitutive models.

TL;DR: In this article , an apparatus with the facility to test soil and roots jointly under uniaxial extension is presented, together with its first results. But root reinforcement on soil has been primarily evaluated through direct shear and roots pull-out tests, while the effect of other stress paths and the behaviour at the soil-root interface are still poorly investigated.

TL;DR: In this paper , the authors investigated the thermal interactions associated with shallow, buried water filled pipes and showed that soil surface ambient conditions and adjacent pipes can both act as sources or sinks of heat.

TL;DR: In this article , the impact of balanced cyclic thermal loading in relation to the initial mechanical loading, for isolated floating piles and pile groups in a frictional soil medium, was evaluated for differing levels of mobilisation of the shaft resistance with respect to the original mechanical loading and for piles at varying spacing based on unit cell approach.

TL;DR: In this article , a series of thermal response tests were performed on a 12 m-long instrumented energy micropile installed in a sedimentary tropical soil to understand the impacts of heating and cooling cycles.

TL;DR: In this paper, the authors performed uniaxial compaction experiments at 35, 75 and 100 MPa effective stress, employing samples of Bentheim sandstone saturated with supercritical phases (i.e., N 2, CO2, wet- N 2 and wet-CO2), distilled water and aqueous solutions (i.,e.g., 3.7 pH HCl solution, AMP solution and AlCl3 solution), as well as low-vacuum (dry) conditions.