通过对土石方调配系统组成、调配关系的系统分析，在考虑开挖、填筑、借土区、弃土区、废料调配的前提下，以系统费用最低为目标，建立了道路工程土石方优化调配线性规划模型。
Linear optimization is often used in the calculation of earth adaptation, the calculation is a huge operation by human if there are many excavation areas and placement areas in it.
出了隘口，你就看见了海堤，还有一片小小的沙滩，现在这里是从英吉利海峡隧道弃土中开发出的一片自然保护区。
Once through, you're into what was the sea wall and a small beach, but is now a nature reserve, created out of the spoil of the Channel tunnel.
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