A new energy-saving design of stereo drain system has been proposed for the surface pre-reinforcement of dredged spoil. In order to verify the feasibility of the new method, field experiments were carried out in the enrichment zone of fine particles of a storage yard. The results show that the new method is more economical and energy-saving because the control area of one 7.5kW vacuum pump in the new method is at least twice as large as that in the traditional method. And it is also highly efficient because the surface pre-reinforcement can be efficiently achieved in a relatively short time of about 90 days. Ground bearing capacity after the reinforcement meets the requirements of the surface pre-reinforcement very well. In consideration of the highlighted reinforcement effect of the geogrid, the actual ground bearing capacity is greater than the calculated value. Besides, the hierarchical loading scheme matching with the new method is reasonable and can be used as reference of other projects. Thus it is feasible to adopt vacuum consolidation with stereo drain system in surface pre-reinforcement of dredged spoil in terms of economy, efficiency and practicality.

ZnS-based mechanoluminescent film has been widely used in the fields of stress visualization and stress sensing, due to its high brightness and repeatable stable luminescent characteristics. To evaluate the flexibleelastic deformation performance of ZnS-based mechanoluminescent film, both visual inspection and digital image correlation (DIC) are, respectively, employed for measuring the ZnS-based mechanoluminescent film. ZnS:Cu 2+ mechanoluminescent powders are first mixed with polydimethylsiloxane (PDMS) matrix to produce ZnS:Cu 2+-PDMS mechanoluminescent film. Then, two measurement experiments are, respectively, conducted to investigate the mechanical response and the flexible-elastic deformation performance of the prepared ZnS:Cu 2+-PDMS mechanoluminescent film. On one hand, the mechanical response performance of the ZnS:Cu 2+-PDMS mechanoluminescent film is validated by visual monitoring of composite concrete fracture processes. On the other hand, the prepared ZnS:Cu 2+-PDMS mechanoluminescent film is also measured by DIC to obtain its full-field deformations and strains information. The flexible-elastic deformation performance of the ZnS:Cu 2+-PDMS mechanoluminescent film is well demonstrated by the DIC measured results.