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Research on Transversal Settlement Characteristics of Strata Caused by Large Diameter in Shield Tunneling Slurry Pressure Balance
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摘要: 基于现场实测的土体长期沉降数据，利用Peck经验算式，对横向地表沉降槽和横向深层土体沉降槽的形态、宽度系数和沉降影响范围进行研究。结果表明： 1）盾构施工引起的土体长期沉降，无论是横向地表沉降还是横向深层土体沉降均符合高斯曲线分布。受扰动土体固结的影响，沉降槽逐渐变深扩宽。2）从地表沉降来看，盾构掘进施工的横向影响范围为1.4倍的隧道直径，受土体长期固结影响增至2.3倍的隧道直径，对于深层土体沉降（埋深12.1 m处），盾构掘进施工的横向影响范围为0.8倍的隧道直径，随着时间的增长，影响范围扩大到1.2倍的隧道直径，盾构施工对深层土体的横向影响范围要小于地表。3）地表沉降和深层土体沉降宽度系数随盾尾脱离被监测断面时间的变化均符合指数分布，沉降宽度系数最终将趋于定值，但地表处沉降槽宽度系数的增长速率和量值均大于深层土体处。4）深层土体横向沉降曲线较陡峭，地表处土体横向沉降曲线较平缓，深层土体横向沉降曲线的曲率大于地表处土地横向沉降曲线的曲率，深层土体横向沉降较集中。Abstract: Based on on-site measured long-term soil settlement data, the Peck empirical formula was used to study the shape, width coefficient and influence range of transversal settlement troughs of ground and deep strata. The results showed that: 1) The long-term settlement of strata caused by shield tunneling, whether it was transversal settlement of ground or deep stratum settlement, conformed to the Gaussian distribution. Affected by the consolidation of disturbed soil, the settlement trough gradually deepened and widened. 2) From the perspective of ground settlement, the transversal settlement caused by shield tunneling construction was in a range of 1.4 times tunnel diameters, which would increase to a range of 2.3 times tunnel diameters due to long-term consolidation of soil. For the deep stratum settlement (buried at a depth of 12.1 m), the affected range by shield tunneling was 0.8 times of tunnel diameters, and over time, the affected range would expand to a range of 1.2 times tunnel diameters. The affected range by shield tunneling in the deep stratum was smaller than that in the ground. 3) The settlement width coefficients of the ground and deep stratum conformed to an exponential distribution with the time of disengagement of the shield tail from the measured cross-section, and leveled off eventually. However, the growth rate and amount of the width coefficient of ground settlement troughs were greater than those of deep soil. 4) The transveral settlement curve the of deep stratum was steep, while the transversal settlement curve of the ground was relatively flat. The curvature of the transversal settlement curve of the deep stratum was larger and more concentrated than that of the ground.
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Key words:
- empirical formula /
- shield tunneling /
- settlement through /
- width factor /
- long-term settlement
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