大直径盾构近穿及下穿对填土桩基础扰动效应分析

发布时间：2018-10-30 21:05

【摘要】：为研究大直径盾构隧道近穿及下穿对填土地基中桩基的扰动影响,依托某大直径盾构隧道工程,结合FLAC~(3D)数值软件,对大直径盾构隧道近穿及下穿对桩基础的位移特征及承载力特性进行模拟分析。分析结果表明:盾构近穿及下穿过程中,对桩基础的位移及沉降存在扰动影响,其中盾构到达前10 m和通过后12 m范围,对桩基沉降影响较大,盾构近穿桩基时,桩基沉降速率较大,盾构下穿桩基时,盾构靠近桩基前20 m,桩基沉降速率变大,通过桩基后,桩基沉降趋于平缓。随着盾构的掘进,桩基靠近隧道处侧摩擦阻力波动较大,且隧道正上方的桩侧负摩阻力增大,易导致建筑物沉降。
[Abstract]:In order to study the disturbance effect of large diameter shield tunneling on pile foundation in fill soil foundation, based on the large diameter shield tunnel engineering and FLAC~ (3D) numerical software, The displacement and bearing capacity characteristics of large diameter shield tunnel are simulated. The results show that there are disturbance effects on the displacement and settlement of the pile foundation in the process of the shield tunneling, in which the settlement of the pile foundation is greatly affected by the shield driving in the range of 10 m before and 12 m after passing, and when the shield is near the pile foundation, it has a great effect on the settlement of the pile foundation when the shield is near to the pile foundation. The settlement rate of the pile foundation is larger. When the shield machine passes through the pile foundation, the settlement rate of the pile foundation becomes larger when the shield machine is close to the pile foundation, and after passing through the pile foundation, the settlement of the pile foundation tends to smooth. With the shield tunneling, the friction resistance of the pile foundation near the tunnel fluctuates greatly, and the negative friction of the pile side above the tunnel increases, which can easily lead to the settlement of the building.
【作者单位】：广州铁路(集团)公司工程质量安全监督站;
【基金】：国家自然科学重点基金资助项目(51538009) 国家自然科学基金资助项目(51578550)
【分类号】：U455.43

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