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首页> 外文会议>North American Tunneling Conference 2002, May 18-22, 2002, Seattle, Washington, USA >Predicting boulder cutting in soft ground tunneling
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Predicting boulder cutting in soft ground tunneling

机译：预测软土地基隧道中的巨石切割

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While much work has been done to predict the presence of boulders, their behavior during excavation remains a mystery. Disc cutters have been effective on boulders on some projects, but on others have plucked out or simply pushed the rocks aside, breaking cutting tools and interfering with the shield steering. In this paper, boulder-ground interaction is modeled for many scenarios using finite elements and the results are compared to 18 case histories. The key result of the research was the importance of boulder to soil shear strength ratio. As the ratio increases, the disc cutter load is transferred from the boulder to the soil. The model showed that when the rock-to-soil shear strength ratio is greater than 600:1, boulders cannot be broken by disc cutters. Of the 18 projects studied, nine validated the model results, seven projects were inconclusive in regards to model correlation and two discounted the model results.
机译：尽管已经进行了很多工作来预测巨石的存在，但是在挖掘过程中它们的行为仍然是个谜。圆盘切刀在某些项目上对大石块有效，但在另一些项目上，圆盘切刀却被拔出或只是将岩石推开，破坏了切割工具并干扰了盾构的转向。在本文中，使用有限元对许多情况下的巨石与地面相互作用进行了建模，并将结果与​​18个案例历史进行了比较。研究的主要结果是巨石与土壤抗剪强度比的重要性。随着比率的增加，圆盘切割机的载荷从巨石传递到土壤。该模型表明，当岩石与土壤的抗剪强度比大于600：1时，圆盘切割机无法将巨石破碎。在所研究的18个项目中，有9个对模型结果进行了验证，其中7个项目在模型相关性方面没有定论，还有2个对模型结果打了折扣。

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