The Research Of New Concrete Precast Blocks For Slope Protection Based On Model Experiment

The destruction of the reservoir slope protection project will seriously threaten the safety of the reservoir dam,and the study of slope protection is of great significance to protect the safety of the dam.Concrete precast block slope protection is widely used because of its many advantages,but traditional concrete precast block slope protection also has many disadvantages such as:poor anti-skid performance,easy to break joints,easy to hollow out the cushion,high cost and unattractive.In view of these shortcomings,this paper proposes a new type of concrete prefabricated block,and at the same time uses the research methods of model experiments and similar analogy analysis to study the indirect joint width and joint material of the prefabricated block.The main research and conclusions of this paper are as follows:Through the investigation of the water conservancy bureaus of various counties in Jiujiang City,it was found that most of the safety accidents that occurred in recent years were due to the smooth surface of the traditional precast block slope protection,people accidentally slipped and caused drowning.To this end,a new type of concrete prefabricated block has been innovated to improve the shortcomings of traditional concrete prefabricated block in this paper in order to achieve the purpose of "slip resistance,wave suppression,safety and beauty".And through the model experiment to verify its anti-skid,wave suppression effect,the experimental results show that its anti-skid,wave suppression effect is good.Aiming at the problem of joint width of precast concrete blocks,a pore water pressure gauge was buried under the sand egg cushion to carry out physical model test of joints of precast concrete blocks for slope protection.The experimental results show that the smaller the joint width,the stronger the anti-scouring ability.To solve the problem of joint materials,the similarity model method was used to shear the model specimens mixed with different materials in different proportions to determine their shear strength.The results show that mortar strength and joint fullness are important factors affecting the shear strength of joint surface.Increasing the strength of the mortar and adding an appropriate amount of expansion agent will increase the shear strength of the joint surface of the joint material.