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

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

Application of image technology on pavement distress detection: A review

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

A new measuring method of mean texture depth of asphalt pavement is proposed based on the technology of multi-line laser and binocular vision. The developed method is incorporated with the profile method and the digital image technology. A three-dimensional mathematical model is established based on the triangulation measuring principle in order to implement the three-dimensional reconstruction of asphalt surface profile. Image processing technology helps locate the exact coordinates of each point on the model. In addition, the techniques of multi-line laser pairing and epipolar restriction are introduced for the image matching between multi-line laser and binocular vision. Through the model and the spatial equations obtained, the values of the mean profile depth of asphalt pavement can be figured out. According to the profile method, an integrated calculation procedure of texture depth is established. A set of sand patch field tests are implemented to verify the reliability of the developed method.

Measurement method of asphalt pavement mean texture depth based on multi-line laser and binocular vision

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 discloses a foundation treatment method adopting a water penetration pile in combination with vacuum preloading. The foundation treatment method comprises the following steps: (1) fabricating the water penetration pile, wherein a pile body of the water penetration pile is a hollow tubular pile and provided with a pile cap; (2) blocking a treatment area of a foundation, forming a zone with a plurality of adjacent single blocks, carrying out synchronous construction on all the blocks during vacuum preloading, and carrying out a flow process between the zones; (3) driving the prefabricated water penetration pile in the foundation in a preloading zone, and fully spreading a sand cushion in a preloading area; (4) laying a vacuum pipe network; (5) paving a sealing film on the surface of the flattened sand cushion for a plurality of times; (6) digging out a seal trench in the periphery of an reinforcement zone, and vertically inserting the edge of the sealing film into weak soil along the inner wall of the seal trench and paving the film at the bottom of the trench flatly; and (7) carrying out vacuumizing and tightening the pile cap. As the water penetration pile is high in rigidity and strength, and good in water penetration performance, the pore water pressure and the settlement respectively accumulated in the foundation treatment process are low, and correspondingly, the post-construction settlement of the foundation is reduced; the bearing strength of the foundation is also improved.

Lou Junjie

Papers

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

Measurement method of asphalt pavement mean texture depth based on multi-line laser and binocular vision

Approximate simulation of storm water runoff over pervious pavement

Foundation treatment method adopting water penetration pile in combination with vacuum preloading

Dynamic responses and damage analyses of tunnel lining and errant large vehicle during collision