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当前,就工程地质和坝工设计理论和实践水平来说,坝基抗剪强度计算值究竟是个什么样的“量”?人们的理解和认识还很不统一,各家所持观点各异。按笔者的理解和认识,坝基抗剪强度计算值,即使在已确定的地质条件下,它也既随试验成果、安全系数、工程措施、施工质量……等因素而变:又随人——即不同决策者的工程经验和技术水平而变。例如:长江三峡工程可行性研究报告建议大坝建基面(花岗岩)纯摩计算值f=0.70～0.75;而美国垦务局专家则建议大坝建基面剪摩计算值f＇=1.0,c＇=21公斤/厘米~2,K_以=3.0(安全系数),初步估算可节省混凝土20％,约360万米~3;如果再
At present, engineering engineering and dam design theory and practice level, the calculated value of the shear strength of the dam foundation is what kind of “quantity”? People’s understanding and understanding is still not uniform, each holding different views. According to the author’s understanding and understanding, the calculated value of the shear strength of the dam foundation, even under the established geological conditions, changes both with the experimental results, the safety factor, the engineering measures and the construction quality ...... and other factors: That is, different decision makers experience of engineering and technical level change. For example, the Feasibility Study Report of the Three Gorges Project suggested that the calculated frictional mass of dam-built surface (granite) should be 0.70-0.75, while that of the Bureau of Reclamation suggested that the calculated value of shear friction at dam foundation should be 1.0, c = 21 kg / cm ~ 2, K_ = 3.0 (safety factor), a preliminary estimate can save 20% of concrete, about 3.6 million meters ~ 3;