实践证明，这种模型很适合大型隧道工程的施工方案优化选择决策。
Finally, the Kuigang tunnel is discussed, which shows that this model is effective for construction scheme optimization and has the value for further study.
本文就工程变更的原因、意义、控制程序、变更工期和价格的处理原则、施工方案的优化进行了较为详尽的论述。
The paper detailed discusses the cause, meaning, controlling program, the dealing principle of time limit for a project and cost of change in the work, and discussing construction scheme optimum.
通过比较六种施工方案的计算结果，进行了方案优化，为业主确定合理的施工方案提供理论依据。
The construction scheme is optimized by comparison between six calculation results, which provides theoretical basis for the owner making appropriate decision.
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