Due to the complex geological conditions and many influencing factors in karst areas, this paper conducted theoretical, experimental research and calculation analysis on the design and construction of engineering piles of bridge engineering in karst cave areas. An algorithm for vertical capacity calculation of rock-socketed piles in karst area based on load transfer method was developed. The results using this new method were analyzed and compared with the results from the static load test of three engineering piles in karst area, and the differences are relatively small. Through static load tests of pile foundation in karst area and study of the side resistance of rock-socketed pile in karst area, the friction resistance of rock-socketed pile and the effect of pile-end resistance, the bearing capacity characteristics of rock-socketed pile in karst area were obtained, achieving the load-sharing effect of cave roof in a rather scientific way. In view of the failure mechanism of the karst cave roof under the pile tip and the large proportion of lateral resistance of the rock-socketed pile, a calculation model for the stability of the karst cave roof under the combined action of the side resistance of the rock-socketed pile and the pile tip resistance is proposed.

In order to explore the factors affecting the drainage performance of open graded asphalt mixture, two kinds of graded open graded asphalt mixture specimens with different compaction times were prepared, and their voids, connected voids and permeability coefficients were tested; At the same time, the fractal parameters of the specimen, the shape of the voids and the range of the voids are calculated. The results show that there is a good correlation between the porosity and connected porosity of open graded asphalt mixture and its permeability coefficient; The void ratio and void roundness of open graded asphalt mixture are inversely affected by gradation and compaction times; There is a good correlation between the void size and shape parameters, void range shape parameters and their permeability coefficient of open graded asphalt mixture, but there is a poor correlation between the void fractal dimension, the passing rate of dividing point and the water permeability.

The intelligent service area can meet the needs of passengers for convenient, efficient and personalized services. High quality and high standard service area can improve the service level for passengers, also can improve the services for the management. Based on this, an advanced technology, such as the internet, web of things, image recognition and GIS, is proposed. Taking the expressway from Huadu to Dongguan as the research object, this paper focuses on improving the informatization level of expressway service area and creating intelligent service area. The overall framework of the smart expressway service area is constructed, the infrastructure configuration requirements of the intelligent expressway service area are put forward. The research results have important reference value to promote the industry development.

No abstract

Under the background of rapid promotion of green highway construction, highway construction pursues efficiency, quality and engineering durability, environmental protection. Highway engineering construction has the phenomenon of high cost and large consumption of supporting power supply system. How to effectively control the power system is an urgent problem when facing highway construction units. Taking the expressway from Huadu to Dongguan as the research object, this paper studies and applies the smart power supply safety management and smart power supply system. This system can effectively deal with the problems of power supply and distribution supervision of Huadu to Dongguan expressway. It can improve the overall operation and management level. It is suitable for promotion and application in Guangdong province and the whole country.