Combination reinforcement mechanism of sub-horizontal jet-grouting and pipe roof in water-rich soft stratum
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摘要: 水平旋喷桩有良好的地层加固及止水功能,然受地层条件、材料特性及工艺所限,难以形成均匀封闭的理想壳体,不能在掌子面前上方组合成有利的预支护壳体结构。为此,笔者提出水平旋喷桩与大管棚复合预支护方案,并采用FLAC3D软件,建立考虑流固耦合的三维模型,对该方案加固机理进行研究。结果表明,在水平旋喷桩下方增设大管棚,可减小桩体的塑性区范围、拉应力,改善旋喷桩的受力;复合结构能充分发挥各自力学优点,即横向可发挥水平旋喷桩的“拱效应”,纵向上利用管棚的“梁效应”;同等条件下,降低水平旋喷桩所受拉应力,从而提高水平旋喷桩自身稳定及加固效果。该方案在广珠铁路江门隧道下穿富水河道段获得了成功应用,可为类似工程设计提供参考。Abstract: The horizontal jet-grouting pile, which is applicable in soil reinforcement and water isolation, is hard to assemble an ideal homogeneous sealed pre-reinforced shell accounting for the restriction of geological condition, material characters and construction technology. For improvement, a composite pre-reinforcement technique utilizing horizontal jet-grouting piles and large pipe shed is proposed. The corresponding 3-D numerical model considering fluid-solid coupling effects is established using FLAC3D for further analysis. The results show that the range of the plastic zone decreases by adding extra pipe shed beneath the piles. The “arch support effect” of piles in horizontal direction and “beam support effect” of shed in vertical direction can be fulfilled. With this technique, the value of the stretch stress of the horizontal rotary jet-grouting piles will be reduced, which results in better stability and reinforcement effect of piles. This technique is successful applied in the water-rich section of Jiangmen tunnel in Guangzhou-Zhuhai Railway, which may provide suggestions for similar projects.
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