Model Test Study On Cemented Sand-gravel Dam Under The Condition Of Double Inclined Plane Foundation

As a new type of dam,the cemented sand-gravel dam has the characteristics of low cost,little damage to the environment,simple construction process,and strong adaptability to the base.It has good prospects in the application of dam projects in China,but it is Anti-sliding stability issues,especially the stability and safety of cemented sand gravel dams on complex foundations.Since there are no relevant engineering examples as references,there are few research results and no systematic framework is formed.For future cemented gravel dams Stone dam construction and construction cannot provide an effective reference,but the geomechanical model test method is a better way to solve the above problems.It can intuitively obtain the instability process,instability shape and safety of the dam body and dam foundation.It is a commonly used method in the analysis of deep anti-sliding stability.As another method,numerical simulation is often used in conjunction with the geomechanical model test method.The two can achieve mutual verification and complement each other.This paper has consulted a lot of information on cemented sand-gravel dams and complex foundations.Considering that China’s permanent cemented-sand-gravel dams are only the Shoukoubao Dam,it is chosen as the dam part of the model.The doubleinclined foundation is commonly used in stability analysis,so the foundation of the more typical Wudu gravity dam is used as the dam foundation part of the model.By adopting a certain similar relationship,the two are combined to establish a new model,and the model is adjusted by the overload method.The failure experiment was carried out to obtain the displacement and stress characteristics during the failure process,the failure process,the failure form and the safety evaluation,and the rationality of the results of the model experiment was verified by the finite element method.The main contents of this paper are as follows:1.First,based on a large amount of engineering data of the cemented sand-gravel dam project and the double-inclined complex foundation,select the Wudu foundation and the Shoukoubao cemented sand-gravel dam as the simulation objects of the model test,determine the similarity relationship,and design the test.2.Obtain the material ratio of the dam body,the dam foundation and the structural surface through the material model test,make and process the model,lay out the measuring equipment and loading system,and establish a complete geomechanical model.3.Use the overload method to carry out the experiment.By analyzing the data of each measuring point in the test and the observed model displacement,determine the model failure process,failure form and characteristics of the dam body and dam foundation,and obtain the overload safety of the 18# dam section The degree is 6.0,and the overload safety degree of the 19# dam section is 6.4.4.Use the finite element calculation software to perform numerical simulation on the dam body and dam foundation,and also use the overload method to simulate the damage process of the dam under the condition of double slope foundation.The damage pattern is basically similar,and the corresponding overload safety degree 18# is obtained.The dam section is 6.2,and the 19# dam section is 6.6,which is a supplementary verification of the results in the geomechanical model test method.