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正断层错动下地铁盾构隧道变形破坏模型试验研究
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Design of CORDIC Algorithm with High Accuracy and Low Consumption
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    摘要:

    为揭示跨隐伏断层地铁盾构隧道结构变形破坏特征,采用自主设计的模拟隐伏断层错动加载试验装置,开展1∶25几何比例的跨断层盾构隧道模型试验,分析正断层错动下盾构隧道的力学响应规律及变形破坏特征.试验结果表明:在2 cm正断层错动影响下,隧道纵向差异变形呈现非线性增大趋势,环缝接头张开变形主要位于断层下盘隧道拱顶及断层上盘隧道拱底,且环缝峰值张开量已超过盾构隧道接缝防水限值;断层延长线与隧道交界处管片直径收敛变形较为严重,该处管片呈现拱腰外侧受拉、拱顶及拱底外侧受压的受力状态;管片与地层之间接触压力受断层错动的影响较大,存在围岩挤压区与围岩松散区,但接触压力峰值相对较小;盾构隧道的主要变形破坏特征为环缝接头拉裂破损、管片纵向开裂及环缝接头变形,管片发生斜向剪切破坏及局部压溃破坏的概率较低.基于盾构隧道环纵向变形破坏特征,建议将管片环缝变形及接头混凝土拉裂破损作为界定跨断层盾构隧道结构破坏的主要控制指标.基于隧道的变形破坏模式,提出了跨断层盾构隧道结构设计及应对措施的建议.

    Abstract:

    To reveal the deformation and failure characteristics of the metro shield tunnel overpassing buried fault, a self-designed loading test device for faulting simulation was used to carry out a 1∶ 25 geometric scale cross-fault shield tunnel model test. The mechanical response law and deformation failure characteristics of the shield tunnel under normal faulting were analyzed. The test results show that under 2 cm normal faulting, the longitudinal differential deformation of the tunnel shows a nonlinear increasing trend. The opening of the circumferential joint is mainly located at the vault of the footwall tunnel. The arch bottom of the hanging wall tunnel and the peak opening of the circumferential joints have exceeded the waterproof limit of the joints. The diameter convergence deformation of the segment lining at the junction of the fault extension line and the tunnel occurs severely. The stress state of the outer side of the arch waist of the tunnel lining is tensioned, while the outer side of the vault and the arch waist are compressed. The contact pressure between the tunnel and the stratum is greatly affected by the faulting, and there are surrounding rock compression and loosening zones. However, the peak value of contact pressure is relatively limited. Tensile fracture of the circumferential joint, longitudinal cracking of the segment, and joint deformation are the main deformation and failure characteristics of the shield tunnel. The probability of oblique shear failure and local crushing failure is low. Based on the longitudinal deformation and failure characteristics of shield tunnels, the joints deformation and the tensile fracture of the circumferential joint should be taken as the main control indexes to define the structural failure of cross-fault shield tunnels. Based on the deformation and failure characteristics of segmental lining, suggestions on structural design and countermeasures of cross-fault shield tunnel are proposed.

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LI Hanyuan, LI Xinggao?,WANG Jie, YANG Yi, LIU Hao.正断层错动下地铁盾构隧道变形破坏模型试验研究[J].湖南大学学报:自然科学版,2024,(5):76~87

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  • 在线发布日期: 2024-05-30
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