Landslide dams are dangerous because the outburst floods produced by dam failures seriously threaten life and property downstream. In this study, a series of physical flume tests were conducted to investigate breaching process landslide with fine-grained, well graded, coarse-grained material under different inflow conditions. The effects discharge on breach development, outflow erosion characteristics studied. resistance materials lateral collapses also discussed. Experimental results reveal...

Shield tunnels are inevitably damaged by complex diseases during operation, so repair and reinforcement essential. The stainless steel corrugated plate (SSCP) has many advantages for tunnel structure because of its high strength, lightweight, convenient construction installation, corrosion resistance. Mechanical behaviors an unreinforced segmental joint a reinforced with new SSCP were investigated full-scale tests. test took into account the actual conditions in field, i.e. bore load alone...

Landslide-debris flow is a sudden geological hazard in mountain areas, which characterized with large scale, fast speed and wide impact range, often causes disastrous accidents. In this study, an indoor sliding chute test was used to study the movement process of landslide-debris its accumulation pattern valley, taking into account initiated gradient particle size distribution. Besides, model reproduced by PFC numerical models were constructed fit actual situation flow. The results show that...

Corrugated steel–concrete (CSC) composite structures are increasingly used in tunnel and culvert projects due to their good mechanical properties. The design of CSC is often governed by deflection limits service, hence it becomes crucial evaluate accurately flexural stiffness. In this work, the deformation mechanism structure studied experimental numerical methods, a simplified formula for calculating stiffness established. addition, results obtained different methods compared analyzed. It...

This article reports on an improved constitutive model for the shear creep behavior of offwhite marbles, which are selected from slope and underground caverns contain green schist's weak structural planes. The samples is characterized using rheological tests. Based experimental measurements mechanical properties under different normal stress conditions, proposed to analyze results. It demonstrated further discussion that such a can reflect nonlinear characteristics planes, especially, it...

Grouting reinforcement is an important method used to solve problems encountered during tunnel construction, such as collapse and water gushing. The grouting diffusion process greatly influenced by the structural characteristics of fractures in a rock mass. First, analytical model single rough fracture under constant-pressure control established based on constitutive equation Bingham fluid. Second, “quasi-elliptical” pattern influence roughness revealed through experiment, which conducted...

This study reported an investigation on mechanical behavior of off-white marbles that were selected from a slope and underground cavern. The marble samples with weak structural planes tested through the multistage loading shear rheological method. results used to evaluate creep planes. It was demonstrated obtained properties rate characteristics such under different normal stress conditions green schist showed obvious brittle failure, shear-creep test curve plane exhibited three stages....

In this work, the effects of geometric imperfections on buckling behavior thin-walled cylindrical shells under compression were investigated by both experimental and numerical methods. The produced one or two circular cutouts shell surface. configuration specimens was fabricated imperfection parameter α, which calculated using cutout radius a, thickness t, cylinder R. investigation, a three-dimensional (3D) Digital Image Correlation Method, an optical instrument utilized full-field...

The expanded distinct element method based on a strain strength criterion was applied herein with the aim of analyzing and comparing cracking behaviors rock-like specimens single flaws under uniaxial biaxial compressions. characteristics in compressions were compared effects confining pressure tensile/shear analyzed. obviously changed boundary condition compression. initiation stress, peak strength, number shear cracks compression larger than affected propagation secondary cracks, failure...

The mechanical properties of rocks are generally controlled by their discontinuities. In this study, the time-dependent behavior rough artificial joints under shearing conditions was investigated. Based on Barton's standard profile lines, samples with joint surfaces were prepared and used to conduct shear creep tests. test results showed that strength discontinuity linearly related roughness, subsequently an empirical equation established. long-term can be identified using inflection point...

In this study, Polyvinylidene fluoride (PVDF) hollow fiber hemodialysis membranes were prepared by non-solvent induced phase separation (NIPS) with compound addtive. The additive was made polyvinyl pyrrolidone (PVP) and Poly ethylene glycol (PEG). results showed that the modified PVDF membrane had better performance than virgin membrane. UF flux of can reach 684 L·h-1·m-2 lysozyme (LZM) passage is 72.6% while 313 53.2%. At same time, biocompatibility also improved. Compared commercial...