乌东德拱坝地基变形模量对上部坝体结构作用效应敏感性分析研究

SENSITIVITY ANALYSIS OF ACTION EFFECT ON SUPERSTRUCTURE OF WUDONGDE ARCH DAM BY THE DEFORMATION MODULUS OF FOUNDATION

水利工程中岩体作为建筑物的基础,其变形对建筑物的影响是不言而喻的.水库蓄水后,在坝体巨大推力和库水压力的作用下,基础将产生变位.当基础产生大量位移时,上部坝体结构的应力和变形将有可能出现较大改变.地基的综合变形参数与组成地基的岩体结构及其岩性有关,决定于各单层岩体的变形参数、各岩性岩体的厚度比例、岩层产状及地质构造等,用其中任何一种岩性岩体的变形参数来代替或者对所有岩体变形参数进行简单的平均都是不合理的.因此论文针对乌东德拱坝坝基地质条件较为复杂这个事实,通过基础变形模量改变所引起的坝体应力、变形的变化,研究基础变形模量变化对坝体应力、变形影响的规律,从而为乌东德拱坝坝体强度的安全评价提供依据.

Rock mass as a kind of common building foundation,it's deformation effect on buildings is self-evident.After reservoir impoundment,under condition of huge thrust of arch dam and reservoir water pressure,deformation of dam foundation happens.When large displacement produced in dam foundation,there may be a great change in stress and deformation in dam superstructure.The deformation parameter of foundation has related to rock mass structures and lithology or rock characteristics and is decided by each rock stratum's deformation parameter,thickness,occurrence,geological structure and so on.It is unreasonable that using one kind of rock stratum's deformation parameter replacing whole deformation parameter or by simple average of each kind of rock stratum's deformation parameter in order to obtain whole deformation parameter.In this paper,considering the complex geological conditions of Wudongde arch dam foundation,through studying stress and deformation change corresponding to foundation modulus change,the sensitivity analysis of action effect on superstructure of Wudongde arch dam by the deformation modulus of foundation has been researched which provide a proof to Wudongde arch dam safety assessment.