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以南阳倒虹吸为典型,通过调整底板宽度和墙背倾角对进口渐变段313+175m断面在原设计方案基础上提出了两套优化方案,并进行了建成无水情况下的稳定复核。结果表明,优化方案2将底板宽度增加1.50m并调整墙背型式后,不但工程量有所减少,地基应力状态得到明显改善,而且墙体重心已控制在基底三分点之内,保证和满足了回填前施工期的稳定,因此是一个比较理想的方案。
Taking Nanyang inverted siphon as a typical example, two sets of optimization schemes were proposed on the 313 + 175m section of the inlet gradient section by adjusting the width of the floor and the dorsal angle of the back wall, and two sets of optimization schemes were put forward based on the original design scheme. The results show that the optimization scheme 2 will increase the floor width by 1.50m and adjust the wall back type, not only reduce the project volume, the foundation stress state has been significantly improved, and the center of gravity of the wall has been controlled within the base third of points, to ensure and meet Backfill construction period before the stability, so it is a more ideal program.