Part I presents the statistical theory of turbulence, and Part 2 the coherent structures in open-channel flows and boundary layers. The book is intended for advanced students and researchers in hydraulic research, fluid mechanics, environmental sciences and related disciplines. References Index.

Turbulence in open-channel flows

Permeable concrete pavements: A review of environmental benefits and durability

Pervious concrete pavements

Numerical analysis of the cracking and failure behaviors of segmental lining structure of an underwater shield tunnel subjected to a derailed high-speed train impact

Review of the flame retardancy on highway tunnel asphalt pavement

Pervious concrete pavements have good drainage capabilities; however, storm water runoff during extreme events can cause the pores clogging in permeable pavement. This study aims to preliminarily reveal the mechanism of sediment clogging in the pores of the pervious concrete pavement under storm water runoff. An innovative continuous permeability measurement system combined with the electrical conductivity measurement is developed. Laboratory simulation tests are conducted with this system to demonstrate the effects of four factors on the permeability reduction. The tests indicate that the pore clogging process generally includes three phases, i.e. quick clogging, temporary mitigation of clogging and progressive clogging. The clogging is more prone to occur in specimens with large porosity. Meanwhile, the variation of electrical conductivity of pervious concrete can accurately reflect the clogging process of pervious concrete. A rapid clogging model has been developed and validated. Research resul...

Experimental simulation of rapid clogging process of pervious concrete pavement caused by storm water runoff

Having the advantages of high permeability and high strength, pervious concrete is suitable for improving ground-bearing capacity. In the Yellow River Delta, a pervious concrete pile (PCP) composite foundation has been constructed to reduce settlement of an expressway embankment. To study the working mechanism of PCPs, a numerical model was constructed based on the finite-difference method and Biot’s consolidation theory, which was validated by data from in situ tests. The excess pore-water pressure, pile–soil stress ratio, lateral displacement, and settlement of the PCP composite foundation under the loading of the road embankment were numerically calculated and compared with those of gravel pile and low-grade concrete pile composite foundations. Comparisons show that the dissipation of excess pore-water pressure in the PCP composite foundation was fastest, which implied that PCPs can significantly mitigate the development of excess pore-water pressure and thus enhance subsoil strength. Furtherm...

Numerical Simulation of Consolidation Settlement of Pervious Concrete Pile Composite Foundation under Road Embankment

The invention relates to a water permeable brick with haze removal and water purification functions and a making method The water permeable brick mainly comprises a surface layer with the haze removal function and a base layer with the water permeable function, and the surface layer is located on the upper portion of the base layer; the surface layer is prepared from, by weight, 80-100 parts of cement, 310-360 parts of coarse sand, 7-11 parts of silicon ash, 25-35 parts of water, 08-12 parts of water reducing agents, 3-6 parts of titanium dioxide and 15-4 parts of activated carbon; the base layer is prepared from, by weight, 90-110 parts of cement, 220-260 parts of stone, 70-110 parts of coarse sand, 8-12 parts of silicon ash, 8-12 parts of VAE, 01-04 part of polyethylene fibers, 25-35 parts of water and 08-12 parts of water reducing agents According to the water permeable brick, novel substance components are designed, the good water purification and haze removal effects are achieved, and superhigh anti-freezing and thawing performance is achieved

Water permeable brick with haze removal and water purification functions and making method

The approximate simulation of storm water run-off over pervious pavement is carried out using both experimental method and numerical simulation. The slope and flow rate changeable flume and uniform porous media are used to approximately simulate the pervious pavement. A 3D computational fluid dynamics – discrete element method is used for numerical simulation of interaction between pervious pavement and fluid. The effects of variation of parameters, including inflow rate, infiltration outflow rate and slope on surface run-off are analysed. The average flow velocity within the surface run-off region and shear velocity increases with the increasing permeability of pervious pavement. The turbulent kinetic energy distribution along depth in the free-flow region is more uniform than empirical relationship for flow over impermeable surfaces. Equations for flow depth and velocity over pervious pavement have been deduced. The results of this study are helpful for the hydraulic design of pervious concrete ...

Approximate simulation of storm water runoff over pervious pavement

The invention relates to a plugging-resistant freeze-resistant pervious concrete pavement brick. The plugging-resistant freeze-resistant pervious concrete pavement brick mainly comprises a plugging-resistant surface layer and a base layer, wherein the plugging-resistant surface layer is positioned on the base layer and consists of the following materials components in a compounding ratio and in parts by weight: 80-100 parts of cement, 310-360 parts of coarse sand, 7-11 parts of silica fume, 6-10 parts of VAE emulsion, 25-35 parts of water and 0.8-1.2 parts of a water reducing agent; the base layer consists of the following material components in the compounding ratio and in parts by weight: 90-110 parts of cement, 220-260 parts of pebbles, 70-110 parts of coarse sand, 8-12 parts of silica fume, 8-12 parts of VAE emulsion, 0.1-0.4 of polyethylene fibers, 25-35 parts of water and 0.8-1.2 parts of a water reducing agent. New material components are designed, so that the concrete brick provided by the invention has good pervious freeze-thaw resistant effects and is not easy to plug.

Tang Weize

Papers

Experimental simulation of rapid clogging process of pervious concrete pavement caused by storm water runoff

Numerical Simulation of Consolidation Settlement of Pervious Concrete Pile Composite Foundation under Road Embankment

Water permeable brick with haze removal and water purification functions and making method

Approximate simulation of storm water runoff over pervious pavement

Plugging-resistant freeze-resistant pervious concrete pavement brick and manufacturing method