Research In Random Model Of Dam's Anti-Seepage Body Part Blemish And Analyzing Methods

The anti-seepage body is the important guarantee of the dam safe operation. Therefore, it's a matter of concern that the anti-seepage body whether could display effectiveness. During the construction quality control process, there are many kinds of factors influencing anti-seepage. Thus, there is more of less "stain", which is called as blemish in this dissertation. The random idea and the method of three-dimensional finite element seepage analyzing are used to simulate and analyze the random blemish's effects to the seepage field in the lower river. Main research content and achievement are as follows:(1) Summarize the domestic and foreign research results, compare each method characteristic, and propose the method of researching and analyzing question in this foundation.(2) Summarize the basic theory of seepage and basic methods of seepage analyzing, combining the actual situation of project, study out the random analyzing way of confirming the size, number and distribution of blemish by the way of Fortran procedure.(3)We used the basic result about potential current and the perfect imperious wall model in overburden layer to work over the analytical result of seep in overburden layer which lower the imperious wall had a single blemish. And we studied the effects to the seepage field in the lower river when we changed the dimension of the blemish, the type of blemish or the head difference.(4) Combining the method of random blemish and three-dimensional finite element, we advanced extraction graduation definition and the graduation analysis method of blemish for using the three-dimensional finite element. In this foundation, we analyzed the extraction graduation blemish using perch cell model and analyzed the graduation blemish using equivalent flux model.(5) We researched the analyzing method of random blemish of rolled concrete dam's layer and clearance plane. Discuss the upstream dam's seepage layer and dam body's layer separately, and study the changes of uplifting pressure, which confirms the importance of the upstream dam's seepage layer.(6) Apply the analyzing method of three-dimensional impervious wall's random blemish to the seepage analyzing and computing of rock fill dam with gravel core wall. Get the result of seepage field when the blemish radius and blemish total area are both different, and the different changes of blemish's effects to seepage field. Furthermore, compare the result of impervious wall seepage coefficient reduction and random blemish methods when the blemish area is the same. And it provided basis for us to control the quality of impervious wall.(7) Summarize the achievement of full dissertation and the problems not yet solved, propose the expectation at last.