Fractional order theory was used to characterize the accelerated creep phase of a nonlinear model. To accurately describe each stage anthracite model, “gyroscope” unit introduced by combining Heaviside function and damage definition. The effect on determined designing completing three-axis graded-separation loading tests anthracite. test curves were combined classify into five stages: transient...

Strengthening the base-angle of a roadway can have beneficial impact on its overall stability, but specific optimal parameter selection range is still unclear. Fast Lagrangian Analysis Continua 3D (FLAC3D) software used to carry out stability analysis 5 kinds models with different section shapes under conditions no support and bolt angles, simulation verification carried actual working Sanshand...

Fracturing roofs to maintain entry (FRME) is a novel longwall mining method, which has been widely used in China, leading new revolution. In order research the change law of side abutment pressure and movement overlying strata when using FRME, monitoring device, namely, flexible detection unit (FDU), developed applied field. The results show that compared with head (also called non-splitting en...

Piles were regarded as elastic materials in the traditional numerical simulation. The pile would not reflect damage of engineering, which misjudge reinforcement effect piles on slopes. specific objective this study was to propose a constitutive model replace analysis pile–slope stability. In study, simulated by model, can plastic deformation pile. factors position and ratio slope’s factor safet...

Coal seam permeability is one of the key factors influencing gas extraction efficiency, which great significance to reduce coal and dynamic disasters in gassy mines. Hydraulic slotting technique an effective method stimulate reservoir, but selection parameters has impact on efficiency. For this reason, hydraulic model was established by using FLAC3D software analyze stress distribution before a...

Performing a probabilistic study rather than a determinist one is a relatively easy way to quantify the uncertainty in an engineering design. Due to the complexity and poor accuracy of the statistical moment methods, the Monte Carlo simulation (MCS) method is wildly used in an engineering design. In this work, an MCS-based reliability analysis was carried out for the stability of the chain pill...

Buried pipes in the modern societies are considered as lifelines with a vital and essential role in the human life cycle. The performance of buried pipes is affected by many factors such as ground surface subsidence. In this paper, the effect of subsidence on pipelines is investigated using a three-dimensional numerical modeling developed in FLAC3D software for four types of most commonly used ...

In order to solve connectivity problems in metropolitan areas, the development of underground metro lines constitutes an unquestionable requirement. However, construction work thereof encounters unfavourable circumstances when surface excavations must be carried out that cross historical areas city, due need control movements. The design city Seville (Spain) from 2004 2006 provides a representa...