盾构参数对复合地层损失率和地表沉降的影响
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李宇健(1996—),男,长沙理工大学硕士生

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U45

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国家自然科学基金资助项目(52078060);湖南省自然科学基金资助项目(2020JJ4606);湖南省教育厅科学研究重点项目(18A127);长沙理工大学“双一流”科学研究国际合作拓展项目(2018IC19);长沙理工大学土木工程优势特色重点学科创新性项目(18ZDXK05)


Effect of shield parameters on formation loss rate and surface subsidence in composite strata
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    摘要:

    为研究土压平衡式盾构机穿越复合地层过程中,不同盾构掘进参数对地表沉降值和地层损失率的影响, 依托湖南商学院站至白鸽咀站区间盾构工程已有的施工沉降监测数据,利用Peck公式反推得到盾构施工在此类地层条件下的地层损失率,并通过三维有限元数值模拟分析了盾构各参数对地表沉降值和地层损失率的影响程度。研究结果表明:在掘进推力增大时,沉降槽宽度减小,沉降值增大,地层损失率增大;在土舱压力增大时, 沉降槽宽度减小,沉降值增大不明显;在注浆压力增大时,沉降槽宽度减小,沉降值也减小,地层损失率减小。 在盾构穿越上软下硬复合地层条件下,进行了盾构掘进参数对地层损失率和地表沉降的影响敏感度的排序,以期为此类地层盾构掘进施工的变形控制提供参考。

    Abstract:

    In order to study the influence of different shield tunneling parameters on the surface subsidence value and formation loss rate during the tunnelling process in composite strata of earth pressure balance shield machine,based on the monitoring data for surface subsidence in the shield tunneling line between Hunan Business School Station and Baigeju Station,the Peck formula was used to infer the ground loss rate of shield tunneling under such strata conditions. The influence extent of each parameter on the surface settlement value and formation loss rate was analyzed by 3D finite element simulation. The results show that with the increase of driving thrust,the width of settling groove decreases and the settlement value increases,and the formation loss rate increases. When the pressure of the earth chamber increases,the width of the settling groove decreases the settlement value increases slightly. When the grouting pressure increases,the width of settling groove decreases,the settlement value also decreases,and the formation loss rate decreases. The sensitivity of shield tunneling parameters to stratum loss rate and surface subsidence were ranked according to the shield tunneling parameters in the upper soft and lower hard composite stratum,which is expected to provide a reference to deformation control during shield tunneling in such stratum.

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  • 在线发布日期: 2022-06-06
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