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郑刚, 张扶正, 张天奇, 查万理. 盾构隧道开挖及补偿注浆对地层扰动影响的室内试验及数值模拟研究[J]. 岩土工程学报, 2016, 38(10): 1741-1753. DOI: 10.11779/CJGE201610001
引用本文: 郑刚, 张扶正, 张天奇, 查万理. 盾构隧道开挖及补偿注浆对地层扰动影响的室内试验及数值模拟研究[J]. 岩土工程学报, 2016, 38(10): 1741-1753. DOI: 10.11779/CJGE201610001
ZHENG Gang, ZHANG Fu-zheng, ZHANG Tian-qi, ZHA Wan-li. Disturbance of shield tunnel excavation and compensation grouting to surrounding soil: laboratory tests and numerical simulations[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(10): 1741-1753. DOI: 10.11779/CJGE201610001
Citation: ZHENG Gang, ZHANG Fu-zheng, ZHANG Tian-qi, ZHA Wan-li. Disturbance of shield tunnel excavation and compensation grouting to surrounding soil: laboratory tests and numerical simulations[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(10): 1741-1753. DOI: 10.11779/CJGE201610001

盾构隧道开挖及补偿注浆对地层扰动影响的室内试验及数值模拟研究

Disturbance of shield tunnel excavation and compensation grouting to surrounding soil: laboratory tests and numerical simulations

  • 摘要: 针对盾构法施工过程中产生的土体损失,补偿注浆是一种应用广泛的沉降控制措施。通过模型试验及数值模拟,研究了盾构隧道开挖及补偿注浆对周围土体的扰动影响。将开挖和补偿注浆连续考虑,重点研究了既有土体损失情况下补偿注浆对地表沉降和周围土体应力的影响规律,研究结果表明,盾构隧道开挖过程中,地表沉降可以用Peck公式有效预测,且沉降最大值与土体损失率呈线性关系,隧道周围土体按照应力变化情况分为正拱区、卸荷区、塑性区。补偿注浆过程中,土体按应力变化情况分为抬升挤压区和正拱补偿区。应用小应变本构模型(HSS)进行数值模拟,模拟结果与试验规律对应良好,进一步验证了模型试验揭示的隧道开挖和补偿注浆对土体的扰动机理。

     

    Abstract: Compensation grouting, as an effective remedial measure, is often adopted to deal with the soil loss engendered in shield tunneling. The model tests with two different scales in dry sand are performed to investigate the disturbance of tunnel excavation and compensation grouting to the surrounding soil. By “tunneling” and “grouting” sequentially in the test, the effect of compensation grouting on both surface settlements and soil stresses in the presence of soil loss is studied. The test data indicate that the surface settlements caused by tunnel excavation can be effectively predicted by the Peck formula, and the maximum settlement value is approximately proportional to the volume loss. During the stage of tunneling, the soil can be divided into three zones corresponding to the stress changes, i.e., the positive arching zone, the unloading zone and the plastic zone. During the stage of grouting, the soil can be divided into two zones according to the stress changes, i.e., the effective upheaval zone and the arching compensation zone. The two-dimensional finite element analysis considering small-strain behavior of the soil is carried out to reproduce the test data, and the simulated results correspond well to the test data, helping to further validate the disturbance mechanism by both “tunneling” and “grouting” revealed in model tests.

     

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