It has been proved, through field-measured data and model test results, that trench width has much effect on vertical earth pressure on trenched flexible pipes such as steel pipelines.

开槽埋设钢管等柔性管时，开槽宽度对于作用于管道上的竖向土压力有着很大的影响，这已被现场实测和模拟试验结果所验证。

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Though the tubing laid on top of the trees during the test run, more permanent pipelines can be installed by laying a tube along roads or rivers, digging a trench, and burying it.

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