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在工程实践中,坝基岩体内往往遇到缓倾角的软弱夹层,夹层抗剪指标较低,必须对大坝沿这种层面的滑动进行核算.目前较常用的方法有:(1)常规法;(2)等K法;(3)有限元法;(4)地质力学模型试验.上述各法常按平面问题处理,实际上大坝深层抗滑计算应属三维问题,因地应力及边界条件总是客观地存在着,如何在抗滑计算中将这些因素包括进去,在计算成果上反映出来,是有待研究的一个问题.早期修建的一些工程虽无地应力资料,但从近期的龙滩、二滩等工程实测地应力看,其数值一般都有几个MPa,它对坝下岩体受力分析是很有意义的.
In engineering practice, the dam foundation rock body often encounters soft bedding with gentle dip angle, the interlayer shear index is low, and the dam sliding along this level must be accounted for. The most commonly used methods are: (1) conventional method ; (2) K method; (3) finite element method; (4) geomechanical model test. The above-mentioned methods are usually deal with plane problems. In fact, the deep anti-slip calculation of the dam should be a three- The conditions are always objectively existing, and how to include these factors in the anti-skid calculation and reflect them in the calculation results is a problem to be studied.Even some of the early construction projects have no ground stress data, Beach, Ertan and other engineering ground stress to see, the numerical generally have a few MPa, it is under the dam rock mass force analysis is of great significance.