The contact state between layers of asphalt pavement not only has a significant effect on the mechanical response of road structure but is also the bottleneck of research on the mechanical behavior of pavement structure at present. In this paper, the effects and laws of different water–salt entry modes, salt solution concentrations, and temperatures coupling on the contact state between base and surface layers are studied by a 45° inclined shear test. The simulation and verification of each working condition are carried out by ABAQUS (Dassault, Paris, France) the friction coefficient between layers is reversed, and the actual contact state between layers is characterized in order to realize comprehensive evaluation and reasonable expression. The results show that different modes have different effects on contact characteristics. At the same temperature and concentration of the salt solution, bonding of water and salt erosion is the best, followed by direct erosion, with the worst being from bottom to top, and the interlayer bonding condition is weakened with increase in temperature. The relative accuracy of the software simulation and test analysis was as high as 92% and the friction coefficient of the water-free salt erosion test piece was found to be about 0.85 at 25 °C, while after the bottom-up erosion of the 14% salt solution the friction coefficient was found to be about 0.43, which indicates that the corrosion of the water–salt will have a great effect on the bonding condition between the structural layers of the road.

Many dam banks of the Yellow River downstream control projects have not been reinforced due to the limitation of project scale and investment, which is a hidden danger affecting flood control safety. Based on the field survey of the dam banks of the Jiangjia Control Project, the stability was analyzed for the dam banks of the project, and suggestions were made for reinforcement of the dam banks of control projects. The results showed that the outer slope ratio was designed to be 1: 1.5 for the dam bank of the Jiangjia Control Project. However, the current minimal slope ratio was 1: 1.2, which was less than the design value. 94.7% of the slope ratio did not meet the standard. The maximal thickness of the flat stone body was 0.2 m, which was much less than the design value of 1.11 m. The flat stone body was thin. 81.25% of the weight did not meet the standard. The percentage of missing flat stone bodies was 81% in the estimated section, and the stability of the dam bank was significantly reduced for the control project. Thus, the results can provide technical support for the comprehensive management of the Yellow River in Jinan.

In anti-seepage engineering, quality control and engineering applications are based on the accurate measurement of seepage indices for low-permeability materials. The test used to determine the seepage indices for low-permeability materials adopts an external source to produce water pressure, and the seepage flux produced during the process requires manual measurement; thus, the apparatus used is complex and difficult to operate, thereby lowering the testing efficiency and restricting its application. In this study, a built-in servo motor was used to produce high water pressure with a pressure transmitter, and it controlled and measured the seepage pressure. According to the rotation number of the electric cylinder motor, the volume change of water in the hydraulic cylinder was calculated and, thus, the seepage flux was deduced. A simple fully automatic seepage apparatus for low-permeability materials was designed with a human–computer interface. The results showed the successful calculation of seepage flux as a function of the rotation number of the servo motor through automatic measurement. Furthermore, the replacement of the external high-pressure source with the built-in servo motor enhanced the safety performance, and the human–computer interface enabled an interactive operation and simplified the measurement structure. This simple testing method can provide technical support for quality inspection and construction control of anti-seepage engineering.

Shen, X.; Zhang, M.; Dong, C., and Lan, Y., 2020. Testing method on water-tightness indexes of non-return tap in water resources engineering. In: Yang, Y.; Mi, C.; Zhao, L., and Lam, S. (eds.), Global Topics and New Trends in Coastal Research: Port, Coastal and Ocean Engineering. Journal of Coastal Research, Special Issue No. 103, pp. 464–468. Coconut Creek (Florida), ISSN 0749-0208.The water-tightness measurement of a non-return tap is complex in testing condition, difficult in infliction of pressure, long in period of observation, low in measuring precision, easy in specimen destruction and so on, there is not an indoor testing apparatus of water-tightness for the non-return tap in water resources engineering. A specimen was fixed with a gate-type frame and a fixing apparatus of auto lifting and falling, the hydraulic pressure for measuring was controlled by an automatic system of pressure control, the measuring of water-tightness was carried out with a piezometer, a piezometric tube, an electromagnetic flowmeter based on analysis of the water-tightness of the non-return tap, and the corresponding testing method was carried out. The test showed that the specimen could be fixed with the fixing apparatus, the needed hydraulic pressure for measurement could be controlled by the automatic system of pressure control, the indexes of water-tightness for a non-return tap could be accurately measured, thus some difficulties were overcome such as complexity of testing condition, difficulty of load infliction, long period of observation, low precision of test and so on, it could be used to measure the water-tightness for the non-return tap. The method can be used to measure the water-tightness and evaluate the engineering quality of the non-return tap.