A Study On Numerical Analysis Of Joint Concrete Block For Slope Protection And Its Application Research

With the rapid development of social economy and the gradual improvement of living standards, people have much higher demand for the ecological environment and landscape. Rivers have not only basic functions of the watercourse such as flood control, drainage, water storage, clean water supply, shipping, etc, but also play an important role in landscape, tourism, ecology and enrichment of surrounding environment, people are eager to see the landscape of clear water and blue sky, river with green trees on both banks, fish and shrimp swimming in the water. Watercourse embankment protecting slope is critical infrastructure to ensure the safety of dike and is also an important part of dike risk elimination and reinforcement construction. The traditional ways of slope protection such as cement stone, concrete plates and molded concrete bag to some extent change the original natural ecological environment of rivers, affect the ecological features and functions of rivers, destroy the harmony and unity of nature and the environment. Therefore, ecological and environmental factors begin to be considered in design of slope structure. The development of slope protection technology has thus transformed from pure engineering measures into eco-friendly technologies in order to adapt to new situation. More environmental friendly ways of slope protection like Ecology, plant and landscape will be the inevitable trend of future development. As environment protection becomes the future trend, a new way of ecological slope protection, articulated concrete block, has been gradually applied in water conservancy project. In this paper, the project of articulated concrete block slope protection of Shenyang Bird Island Park is taken as an example; it is comprehensively studied and systematically analyzed to explore the analysis and calculation of slope stability, frozen and expansion monitor and social benefit etc. The paper mainly consists of following six parts:(1)It is verified by theoretical calculation and construction practice that concrete pouring and heavy pressure on the top of the protected slope and cement block reinforced at bottom of slope will greatly increase safety and stability of protection slope, which provide reliable basis and experience for future projects.(2)The stability of articulated concrete block protected slope is being analyzed by using limit equilibrium method. Firstly, calculated the stability of slope soil (no block) by using slice method, secondly, calculated the stability of slope (soil and block) by improving slice method (take block into consideration), it is proved that Bishop slice method is more suitable after comparisons and analysis of these two method. Based on Bishop Slice method, further calculated slope stability and safety coefficient with different slope angle and concrete block weight, it is showed that the different slope angle and blocks is not sensitive to the stability of protected slope.(3)Numerical simulation model of articulated concrete blocks protected slope is established by using FLAC data analysis software, Strength reduction techniques is used to calculate and analyze slope stability, more accurate results can be obtained by comparing and analyzing calculated slope stability and safety coefficients under different parameters.(4)Impact on stability of protected slop under different water level is thoroughly discussed by using finite difference method of continuous medium stable seepage mathematical model, which is to calculate and analyze influence on stability of protected slope under various parameters as water levels change.(5)As for frozen expansion in northern cold region, field deformation monitoring is conducted at typical part of articulated concrete block protected slope, by analyzing data collected at different location and in various time and multiple freeze-thaw cycle test of concrete block, it is proved that this protected slope can meet and suit the requirements of anti-frozen and frozen expansion deformation in northern cold region, and will not be damaged due to frozen expansion.(6)When project of the articulated concrete block protected slope was finished, field monitoring is conducted in following several consecutive years, it is shown that Soil and water conservation is obvious, land resources is saved, afforesting requirement is met, effectiveness of the landscape is increased, and it saves investment and ongoing maintenance costs compared with other ways of slope protection, it can be said that its economic benefits are significant.