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首页> 外文期刊>Tunnelling and underground space technology >An experimental study of the effect of local contact loss on the earth pressure distribution on existing tunnel linings
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An experimental study of the effect of local contact loss on the earth pressure distribution on existing tunnel linings

机译：局部接触损耗对既有隧道衬砌土压力分布影响的试验研究

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This study presents the results of the experimental investigation that has been conducted to examine the effect of local contact loss between a tunnel lining and the surrounding ground on the earth pressure distribution acting on the tunnel liner. An experimental setup has been designed using a mechanically adjustable tunnel model to simulate the initial lining pressure that results from shield tunnelling. A local separation between the lining and the surrounding soil was introduced at different locations around the tunnel and the changes in contact pressure were measured. Results indicated significant changes in earth pressure in the close vicinity of the area that has experienced the contact loss. The changes in earth pressure differed greatly depending on the location of the induced separation. When located at the invert and haunches results showed an increase in pressure by about 28%, whereas a pressure decrease of about 75% was measured immediately above the separated section when located at the springline. The above results suggest that the presence of a small lining area that is not in direct contact with the surrounding ground can have a significant impact on the performance of the tunnel lining.
机译：这项研究提出了实验研究的结果，以检查隧道衬砌和周围地面之间的局部接触损耗对作用在隧道衬砌上的土压力分布的影响。使用机械可调的隧道模型设计了一个实验装置，以模拟盾构隧道施工引起的初始衬砌压力。在隧道周围的不同位置引入衬砌和周围土壤之间的局部分隔，并测量接触压力的变化。结果表明在接触损耗区域附近的土压力发生了显着变化。土压力的变化取决于诱导分离的位置而有很大不同。当位于内转和臀部时，结果显示压力增加了约28％，而位于弹簧线处的分离部分上方的压力下降了约75％。以上结果表明，与周围地面不直接接触的小衬砌区域的存在会对隧道衬砌的性能产生重大影响。

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