浅埋盾构隧道开挖面失稳发展过程模型试验
发布时间：2018-08-08 21:28
【摘要】：为了研究开挖面支护力、地层变形规律和开挖面失稳发展过程,利用对称性,采用半隧道模型,进行不同支护板后退速率下的4组试验.结果表明,支护板后退速率影响支护力和地层变形数值,而不影响其发展规律.随着支护板位移增大,支护力快速下降到最小值,接着上升到稳定值.相应地,开挖面失稳发展依次经历局部剪切带、闭合剪切带、贯穿剪切带3个阶段.与理论模型的对比发现,机动场模型处于闭合剪切带阶段,得到的支护力更接近于最小支护力;楔形体模型处于贯穿剪切带阶段,得到的支护力更接近于稳定支护力.
[Abstract]:In order to study the support force of excavation face, the law of formation deformation and the development process of excavation face instability, four groups of experiments were carried out with semi-tunnel model by using symmetry. The results show that the retrogression rate of the support plate affects the support force and the deformation value of the stratum, but does not affect its development law. With the increase of support plate displacement, the support force rapidly decreases to the minimum value, and then rises to the stable value. Accordingly, the instability development of excavated face goes through three stages: local shear zone, closed shear zone and shear zone. Compared with the theoretical model, the maneuvering field model is in the closed shear zone stage, and the support force is closer to the minimum support force, and the wedge model is in the shear zone stage, and the support force is closer to the stable support force.
【作者单位】： 浙江大学滨海和城市岩土工程研究中心;中国电建集团华东勘测设计研究院;浙江大学防灾工程研究所;苏州大学城市轨道交通学院;
【基金】：国家自然科学青年基金资助项目(51508503) 浙江省自然科学基金资助项目(LY16D020002) 华东勘测设计研究院科技资助项目(K2013-02-30)
【分类号】：U455.43
，
本文编号：2173087
[Abstract]:In order to study the support force of excavation face, the law of formation deformation and the development process of excavation face instability, four groups of experiments were carried out with semi-tunnel model by using symmetry. The results show that the retrogression rate of the support plate affects the support force and the deformation value of the stratum, but does not affect its development law. With the increase of support plate displacement, the support force rapidly decreases to the minimum value, and then rises to the stable value. Accordingly, the instability development of excavated face goes through three stages: local shear zone, closed shear zone and shear zone. Compared with the theoretical model, the maneuvering field model is in the closed shear zone stage, and the support force is closer to the minimum support force, and the wedge model is in the shear zone stage, and the support force is closer to the stable support force.
【作者单位】： 浙江大学滨海和城市岩土工程研究中心;中国电建集团华东勘测设计研究院;浙江大学防灾工程研究所;苏州大学城市轨道交通学院;
【基金】：国家自然科学青年基金资助项目(51508503) 浙江省自然科学基金资助项目(LY16D020002) 华东勘测设计研究院科技资助项目(K2013-02-30)
【分类号】：U455.43
，
本文编号：2173087
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