软土盾构隧道横向大变形侧向注浆控制机理研究
发布时间：2018-08-15 12:41
【摘要】：注浆是治理软土盾构隧道横向变形等隧道病害经常采用的方法。提出了采用注浆引起的土体体积应变模拟隧道注浆效果的方法,并利用上海地铁隧道注浆加固实践验证了该方法的合理性。利用该方法,以注浆引起的隧道横向收敛、接头张开和错台变化为指标,分析了隧道侧向注浆对隧道横向变形的影响规律,揭示了注浆对隧道横向变形的作用机理;研究了注浆量和注浆范围对注浆加固效果的影响规律。研究发现,注浆能有效改善隧道横向收敛、减小接头张开量。在注浆初期,注浆对隧道横向变形的影响以管片转动为主,该阶段隧道接头张开量减小显著,而隧道收敛减小则相对缓慢;随注浆量的增加,注浆引起的管片运动以刚体平动位移为主,该阶段隧道横向收敛显著减小,但注浆引起的接头错台量和隧道侧向位移则不断增加。最后,以上海地铁隧道为背景,对注浆量和注浆加固范围提出了优化建议。
[Abstract]:Grouting is often used to control tunnel diseases such as transverse deformation of shield tunnel in soft soil. A method of simulating tunnel grouting effect by volume strain of soil caused by grouting is put forward, and the rationality of this method is verified by grouting reinforcement practice in Shanghai subway tunnel. By using this method, the influence of lateral grouting on lateral deformation of tunnel is analyzed, and the mechanism of grouting on lateral deformation of tunnel is revealed by taking the lateral convergence, joint opening and staggered change of tunnel caused by grouting as indicators. The effect of grouting quantity and grouting range on grouting reinforcement effect is studied. It is found that grouting can effectively improve the transverse convergence of the tunnel and reduce the joint opening. In the early stage of grouting, the effect of grouting on the transverse deformation of the tunnel is mainly caused by segment rotation. In this stage, the opening of tunnel joint decreases significantly, while the convergence of tunnel decreases relatively slowly, and with the increase of grouting amount, The segment motion caused by grouting is mainly rigid body translational displacement, the transverse convergence of tunnel decreases significantly in this stage, but the joint stagger and tunnel lateral displacement caused by grouting continue to increase. Finally, on the background of Shanghai Metro Tunnel, the optimization suggestions on grouting quantity and grouting reinforcement range are put forward.
【作者单位】： 同济大学岩土及地下工程教育部重点实验室;同济大学土木工程学院地下建筑与工程系;武汉市市政工程质量监督站;上海地铁维护保障有限公司;
【基金】：国家自然科学基金项目(51278379) 国家基础研究技术项目(2011CB013800) 上海市自然科学基金项目(12ZR1433600) 上海青年科技启明星计划项目(14QB1401100)
【分类号】：U455.43;U457.2
[Abstract]:Grouting is often used to control tunnel diseases such as transverse deformation of shield tunnel in soft soil. A method of simulating tunnel grouting effect by volume strain of soil caused by grouting is put forward, and the rationality of this method is verified by grouting reinforcement practice in Shanghai subway tunnel. By using this method, the influence of lateral grouting on lateral deformation of tunnel is analyzed, and the mechanism of grouting on lateral deformation of tunnel is revealed by taking the lateral convergence, joint opening and staggered change of tunnel caused by grouting as indicators. The effect of grouting quantity and grouting range on grouting reinforcement effect is studied. It is found that grouting can effectively improve the transverse convergence of the tunnel and reduce the joint opening. In the early stage of grouting, the effect of grouting on the transverse deformation of the tunnel is mainly caused by segment rotation. In this stage, the opening of tunnel joint decreases significantly, while the convergence of tunnel decreases relatively slowly, and with the increase of grouting amount, The segment motion caused by grouting is mainly rigid body translational displacement, the transverse convergence of tunnel decreases significantly in this stage, but the joint stagger and tunnel lateral displacement caused by grouting continue to increase. Finally, on the background of Shanghai Metro Tunnel, the optimization suggestions on grouting quantity and grouting reinforcement range are put forward.
【作者单位】： 同济大学岩土及地下工程教育部重点实验室;同济大学土木工程学院地下建筑与工程系;武汉市市政工程质量监督站;上海地铁维护保障有限公司;
【基金】：国家自然科学基金项目(51278379) 国家基础研究技术项目(2011CB013800) 上海市自然科学基金项目(12ZR1433600) 上海青年科技启明星计划项目(14QB1401100)
【分类号】：U455.43;U457.2
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