STUDY OF INTERACTION BETWEEN HIGH ARCH DAM AND ABUTMENT EXCAVATED SLOPE
STUDY OF INTERACTION BETWEEN HIGH ARCH DAM AND ABUTMENT EXCAVATED SLOPE
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发表时间：
2010
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通讯作者：
Chang Qiang
中科院分区：
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作者：
Chang Qiang
在中国西南地区，一批高拱坝在建或拟建。由于高拱坝和高拱坡的地质条件和地质特征复杂，坝肩开挖边坡相互作用成为该地区的一个重要问题。在弹塑性理论的基础上，提出了以塑性余能为参数的结构稳定性分析方法，在一定的加载条件下，弹塑性本构关系使塑性余能最小的结构趋于稳定。指出弹塑性结构在规定的荷载作用下，如果不能同时满足平衡条件、运动容许性和本构方程，就不是稳定的。如果塑性余能等于0，即应力场可以同时满足平衡条件和本构方程，则结构是稳定的；如果塑性余能大于0，则结构是不稳定的。基于Drucker-Prager准则，在非线性有限元计算中考虑了一种理想的弹塑性增量分析方法，该方法对小加载步长和大加载步长都有较好的收敛性能，并将其应用于锦屏一号坝坡相互作用的研究，得到了随强度折减而变化的塑性余能曲线，反映了坡坝之间的相互作用。结果表明，拱坝产生的推力在一定程度上有利于边坡的稳定，当强度折减率大于1.5时，边坡结构强度折减对拱坝的影响不大。
In southwest district of China,a number of high arch dams are being built or going to be built. Due to the complicated geological conditions and features of high arch dams and slopes,the interaction between dams and abutment excavated slopes has become an important issue in this area. On the basis of elastoplastic theory,the analysis method of structure stability using plastic complementary energy as parameter is proposed;and under specified loading conditions,elastoplastic constitutive relation makes the structure whose plastic complementary energy is minimum tend to be stable. It points out that an elastoplastic structure is not stable if it can′t satisfy simultaneously equilibrium condition,kinematical admissibility and constitutive equations under the prescribed loading. If the plastic complementary energy equals 0,which means that the stress field can satisfy equilibrium condition and constitutive equation at the same time,then the structure is stable;if the plastic complementary energy is greater than 0,then it means the structure is unstable. Based on Drucker-Prager criteria,a perfect elastoplastic incremental analysis method is considered in nonlinear finite element computation,which has good convergence for both small and large loading step sizes;then above method is used to study the interaction between slope and dam of Jinping I. Plastic complementary energy curves varying with strength reduction are provided to show the interaction between slope and dam. The results show that the push force coming from the arch dam is of some benefits to the slope′s stability to some extent;and the slope structure strength reduction has little influence on arch dam until the strength reduction rate is larger than 1.5.