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In soft ground, adaptable muck removal is key

机译：在柔软的土地上，适应性除渣是关键

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At 6 percent downgrade to a low point beneath California's Sacramento River, the Lower Northwest Interceptor Sewer was a difficult project from the outset. Project owner Sacramento County Regional Sanitation District (SRC-SD) planned to excavate the V-shaped tunnel in two sections using an earth pressure balance (EPB) machine in soft ground. Muck removal, due to the steep downgrade, was a tricky proposition. "We did look at muck cars, but determined they were not the best option due to the relatively steep slope of the tunnel alignment. The safety benefits of conveyors on this job were obvious, as there were not the potential hazards associated with muck cars traveling on an incline or derailing," said Steve Norris, senior civil engineer for SRCSD.
机译：降下6％到加利福尼亚萨克拉曼多河以下的低点时，西北拦截器下水道从一开始就是一个困难的项目。项目所有者萨克拉曼多县区域卫生区（SRC-SD）计划在软土地基中使用土压平衡（EPB）机器分两部分开挖V型隧道。由于降级幅度太大，去除泥渣是一个棘手的提议。 “我们确实研究过运土车，但由于隧道路线的坡度相对较陡，因此确定它们不是最佳选择。输送机在这项工作中的安全效益是显而易见的，因为运土车没有潜在的危险”。SRCSD的高级土木工程师史蒂夫·诺里斯（Steve Norris）说。

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