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一、前言关于拱坝坝肩的稳定计算,目前国内外流行多种计算方法,但采用较多的是文献[1]所介绍和推荐的单位厚水平层法。对该法稳定安全系数 K 值有影响的内力,主要有拱端轴力和剪力(包括边梁或冠梁在拱座处投影迭加值)。内力的计算也有多种方法,常用的有纯拱法、拱冠梁法和多拱梁法等。各法所得结果不同,对 K 值的影响也不同。文献[2]认为内力计算应该采用拱冠梁法,如采用纯拱法则所得 K 值偏于不安全。究竟采用何法为宜,各法的假定情况和它的计算成果对坝肩稳定安全系数的影响如何,便是本文所要探讨的。
I. Foreword On the stability calculation of arch dam abutments, many popular calculation methods at home and abroad are currently adopted, but the more thick horizontal layer method introduced and recommended in [1] is adopted. The internal forces affecting the K value of the stability and safety factor of the method are mainly the axial forces and shear forces at the arch end (including the projected superposition of the side beam or crown beam at the abutment). The calculation of internal forces also have a variety of methods commonly used are pure arch method, arch crown beam method and multi-arch beam method. The results obtained by each method are different, the impact of K values are also different. Literature [2] that the calculation of internal forces should be used arch crown method, such as the use of pure arch law K value partial to unsafe. What method should be adopted is appropriate, and the assumptions of each law and the impact of its calculation on the stability safety factor of the abutment are the topics to be explored in this paper.