摘要
分析研究了拱坝沿建基面滑动问题的实质及在实际工程中发生的可能性．研究结果表明，在一定的几何与力学参数条件下，拱坝受水压和温度等荷载作用，拱端推力确有使拱坝沿建基面滑动的可能．而这种滑动并不是简单的“上滑”，实际上是略带向上的向下游滑动，且主要是向下游滑动．影响这种滑动的因素是多方面的，包括坝高、河谷断面的形状、水平拱圈的曲率和坝体厚度等．文中就这几种因素对拱坝沿建基面滑动的影响规律进行了探讨．初步分析结果表明，坝愈高，河谷岸坡角愈平缓，水平拱圈愈扁平，坝体愈薄对拱坝沿建基面的抗滑稳定愈不利．为了有效的反映拱坝的整体作用，提出了一种基于刚体极限平衡法的计算拱坝沿建基面滑动的整体稳定分析方法，通过对一理想化的模型坝实例计算，表明此法的分析结果基本合理．最后，结合小湾拱坝工程实际，用本文提出的方法分析了其沿建基面的抗滑稳定问题．
The substance of sliding along the contact face of arch dams is studied in this paper. The possi-bility and conditions of occurrence of this mode of sliding are also discussed. The studied results show that thismode of sliding may be occurred on the certain conditions of geometric and mechanical parameters when the dambears water pressures and thermal loads. But this mode of sliding is not simple 'Up-Sliding',it is sliding to-wards the downstream with a little uplift along the contact face between dam and foundation. The factors af-fecting this mode of sliding include the height of dam, the shape of canyon profile, the curvature of horigontalarch and the thickness of dam body. The regularity influenced by these factors on this sliding is researched pre-liminarily. The results show that the more high and thin the dam, flat the horigontal arch, gentle the canyonwall slope, the more disadvantageous to the stability against this. A monolithic stability analysis method basedon rigid body limit equilibrium is presented in the paper to study this mode of sliding effectively. Finally, thestability analysis of s1iding along the contact face of dam-foundation of the Xiaowan Arch Dam is carried out us-ing this method.
出处
《水利水电技术》
CSCD
北大核心
1998年第8期5-11,共7页
Water Resources and Hydropower Engineering
关键词
拱坝
建基面
抗滑稳定
刚体极限平衡
坝基面
arch dam, contact face between dam and foundation, stability against sliding, rigid body limit equilibrium
