Discontinuity damage and shear strength weakening under dynamic loading are important causes of engineering rock instability. To study the mechanism discontinuities law after disturbance, dominant controlling factors loading-induced discontinuity were analyzed using discrete element method. The evolution characteristics formation revealed, was quantitatively characterized verified by laboratory tests. results as follows: (1) Due to symmetry structural distribution material properties, a 2D...

Rock joints are important factors affecting natural disasters such as landslides, and weak interlayer is the decisive factor for rock joint stability. Therefore, it necessary to carry out shear test research on with interlayer. In this paper, red sandstone was used material, consistent saw-tooth were produced by 3D carving technology. According on-site composition analysis, in obtained through remodeling. Weak different moisture contents filling degrees Constant Dry Mass Method (CDMM). Shear...

This paper presents a simple but workable constitutive model for the stress–strain relationship of sandy soil during process tunneling construction disturbance in coastal cities. The was developed by linking parameter K and internal angle φ Duncan–Chang with disturbed degree sand, which effects initial void ratio on strength deformation property sands are considered using unified function based state concept theory. Three cases were analyzed to investigate validity proposed considering...

In the construction of shaft, blockage mucking shaft may cause mud-water inrush disaster. Oversized rock fragmentation is main for in raise boring machine (RBM) method. The influence degree blasting parameters on after quantified by adopting analytic hierarchy process (AHP). On this basis, maximum control model based double hidden layer BP neural network proposed. Results show that discharged from should not exceed 1/3 diameter slag chute. weight minimum resistance line accounts to 15.6%,...

This paper aims to present a Neutrosophic Genetic Algorithm (NGA) and its application the clustering of rock discontinuity sets. The NGA method integrates principles neutrosophic theory into (GA) address challenges associated with true, false indeterminate information. By dividing each generated GA population three solution spaces: false, solutions, proposed effectively considers controls operation laws chromosomes in spaces obtain optimal suboptimal solutions true space. Through numerical...

Metro Jet System (MJS) joint microdisturbance reinforcement is often adopted to strengthen and remediate existing tunnels that are severely deformed by under‐construction peripheral works, but analysis related the system of tunnel under consideration seismic effects insufficient at present. In this work, a field test MJS was conducted on basis subway deformation project. Then, numerical simulation study dynamic response performed in combination with wave direction intensity. Results show...

Dynamic load is an important factor affecting the safety and stability of subway tunnel structures. To obtain variation law shield structure dynamic response under aircraft taxiing load, a three‐dimensional numerical simulation such action performed on basis project involving orthogonal underpass taxiway. The effects sliding speed depth are also analyzed. results show that transverse displacement acceleration segment exhibit evident time‐space effect load. arch waist increase first then...

Load transformation from the yielding part of soil to adjacent is known as arching effect, which plays an important role in design various geotechnical infrastructures. Terzaghi’s trapdoor test was milestone development theories on arching. The research earth pressure problem presented this paper using three-dimensional (3D) discrete element method (DEM). Five 3D models with different heights are established by DEM software PFC 3D. variation downward movement trapdoor, distribution vertical...

In this study, two anisotropic damage models, the micromechanics-based elastic model (ME-ADM) and localized (LE-ADM), are proposed to investigate ductile brittle behaviors of rocks under tension, based on Mori-Tanaka homogenization method. The ME-ADM is formulated behavior by focusing diffuse phase characterizing material as a matrix containing oriented microcracks, with continuous criterion used define evolution due crack growth in preferred directions. LE-ADM when transitions from diffused...

Groove of preventing the compacting effect was an effective construction measure decreasing effects jacked pile. An appropriate finite element model adopting Drucker-Prager failure criterion and deformation theory proposed according to actual process This can simulate interaction pile soil continuous penetration. Displacement fields on groove were studied through model, simulation results compared. The show depth situation are important influencing parameters displacement obviously be...

A review of literature on surface morphology rock joints indicated that the is a crucial factor for evaluating stability mass engineering, which have not quite got particular attention research scholars yet.Hence, this paper aims to study shear characteristics saw tooth.Firstly, we can procure material has similar physio-mechanical properties as through testing ratios different raw materials, such gypsum, gypsum retarder, and water.Then, according plan design, 3 numbers joint specimens teeth...