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水电站地下埋藏式钢岔管承载能力是工程设计中非常重要的一个内容,但目前对于钢岔管与围岩联合承载的机理还缺乏系统深入的研究。本文结合某抽水蓄能电站的工程实际,按照钢衬与围岩联合承载的原理,用三维非线性有限元对埋藏式钢岔管进行了计算分析。计算结果表明:在钢衬与围岩共同承受内水压力时,围岩发挥了重要作用,围岩的性能越好,所分担的内水压力就越大,因此在埋深足够的情况下,应充分利用围岩进行分载,以减小钢衬厚度,从而节约工程投资。
The bearing capacity of underground buried steel bifurcation pipe of hydropower station is a very important part in engineering design. However, there is no systematic and in-depth study on the mechanism of joint bearing of steel bifurcated pipe and surrounding rock. According to the engineering practice of a pumped storage power plant, the buried steel bifurcation pipes are calculated and analyzed by the three-dimensional nonlinear finite element method according to the principle of joint bearing of steel lining and surrounding rock. The calculation results show that the surrounding rock plays an important role when the steel liner and the surrounding rock share the internal water pressure, and the better the performance of the surrounding rock is, the greater the pressure of the internal water is. Therefore, under the condition of sufficient depth, Should make full use of the surrounding rock sub-load, in order to reduce the thickness of steel lining, thereby saving engineering investment.