To study the stress distribution characteristics of surrounding rock and spalling mechanism deep hard tunnels with different arch heights, complex variable function angle-preserving transformation method in elasticity theory were applied to analytic solution tangential during adjustment. In addition, true triaxial tests conducted on granite cube specimens (100 mm × 100 mm) containing holes thre...

Hard rock pillar is a crucial mass structure to maintain the stability of underground mine. It needs special attention analyze its from point quality. In this paper, geological strength index (GSI) representing quality hard examined as new influence factor stability, and combined with conventional parameters (uniaxial compressive (UCS) intact mass, width (w), height (h), ratio (w/h)) complete s...

Sedimentary rocks provide information on previous environments the surface of Earth. As a result, they are principal narrators former climate, life, and important events The complexity cost direct destructive laboratory tests adversely affect data scarcity problem, making development intelligent indirect methods an integral step in attempts to address problem faced by rock engineering projects....

TBM boreability and performance prediction has always been a hot research topic. In this paper, taking one large diameter long tunnel excavated by gripper hard rock in Northeastern China as background, based on number of boring data site mono-factorial regression analysis the correlations among Field Penetration Index (FPI) geological parameters, multi-factorial correlation formula FPI with uni...

In this paper, to identify the roof unconfined compressive strength (UCS) in process of coal mine roadway support real-time and optimize drilling speed while drilling, paper proposes establishes a test method for assessing uniaxial roof. This can be used drilling. Moreover, mathematical model power output is developed roof-strata identification system with system. The results were as follows: (...

As mechanical characteristics are one of the most important indexes that represent backfill effect CPB, curing stress is less considered, thus, establishing a damage constitutive model under has great significance for stability CPB. Firstly, multifield coupling experiment was developed, and uniaxial pressure testing used to test parameters. Then, evolution rule considering stress, analyzed. Sec...

Abstract Evaluation of geothermal reservoir modification potential is great significance for improving the efficiency exploitation and reducing costs. However, it difficult to accurately evaluate given limited number parameters used in practical studies. Therefore, an evaluation method that considers development by applying multiple essential. In this study, five types rock samples are collecte...

In this study, the Young modulus (E) of different coals was investigated using artificial neural networks (ANN). For purpose, a comprehensive literature survey carried out to compile such datasets available for ANN analyses. As result survey, database composed 81 formed. analyses, uniaxial compressive strength (UCS) and dry density (ρd) were adopted as input parameters. The analysis results dem...