Research On The Later Deformation Of Earth-rock Dam Based On Observation Data

The core-wall rockfill dam has characterized as: materias environmental protection and explored nearby,simple structure,better adaptability to the foundation deformation,economical and practical,abundant construction experience.It is advanced and widely used type of dam in the world.In our country,100-meter earth-rock dam starts from the Lubuge earth rockfill dam,and then a number of representative projects have been completed.At present,the development of high earth-rock dam has reached 300 m level.With the increasing number and height of dams,the safety of earth-rock dams becomes more and more important.The deformation control and prediction of high-core rockfill dams has become an important research content,and the deformation caused by later rheology and wetting cannot be ignored.According to the prototype observation data,it is an effective method to determine the reasonable dam settlement model.The model can be used for quantitative analysis and prediction of settlement,which can reflect the development of rockfill deformation in the later period.This paper analyzes and studies a high-core rockfill dam.The main work is as follows:(1)The prototype observation data of rockfill dam core wall and downstream rockfill body are analyzed.Based on the analysis results,the factors affecting the settlement of the rockfill dam are summarized,and the specific mathematical expressions of the main influencing factors of the rockfill dam studied in this paper are determined.(2)The settlement statistical model of the core wall of the dam body and the downstream measuring points was fitted by multiple regression analysis.The maximum settlement of the dam is predicted by using the settlement statistical model.The measured values are separated by the settlement statistical model,and then the effects of filling,water pressure and aging on the dam settlement are analyzed quantitatively.The settlement statistical model has a certain physical significance,which can explain the cause and influence mechanism of the displacement of the dam,and has a certain reference significance for the deformation analysis of the high core rockfill dam.(3)The static calculation model of rheological and wetting constitutive relation is established in the finite element numerical analysis method.The finite element calculation results are compared with the measured data to verify the correctness of the finite element calculation.The fitting results are compared with the settlement statistical model,so as to verify the feasibility of the settlement statistical model.Separate finite element calculation results for the filling weight,water storage components and rheology.Compared with the fitting results of the settlement statistical model,the results show that the rheological deformation of the rockfill body accounts for a large proportion,which needs to be seriously considered.The calculation of rheological deformation plays an important role in the later deformation of dam.