GPST盾构隧道是盾构机直接由地面出发和接收的新型工法，在盾构始发和接收阶段，难免会经历不同浅覆土工况。地面堆载、抗浮板、隧道内压重等抗浮技术是防止隧道上浮的有效技术措施。本文借助Abaqus有限元数值模拟软件，揭示了不同抗浮技术对隧道上浮的影响规律，并针对上海软土地区工况，给出了不同埋深比下隧道抗浮措施的建议。研究结果表明，软土地区无工作井大直径盾构掘进时，地面堆载的抗浮作用明显小于隧道内压重，且同等压重条件下，隧道内压重产生的上浮量减小百分比约为地面堆载的3倍。
GPST shield tunnel is a new type of construction method in which the shield machine directly starts and receives from the ground. It is inevitable that it will experience different shallow overburden conditions during the initial and receiving stages of the shield. Technologies such as ground loading, anti-floating plates, and pressure in the tunnel are effective technical measures to prevent the tunnel from floating. In this paper, with the aid of Abaqus finite element numerical simulation software, the influence of different anti-floating measures on the floating of the tunnel is investigated. According to the working conditions of the soft soil area in Shanghai, suggestions for anti-floating measures of the tunnel under different buried depth ratios are given. The research results show that when large-diameter shield tunneling in soft soil areas, the anti-floating effect of the ground load is significantly less than the pressure in the tunnel, and under the same weight, the reduction in the amount of floating caused by the pressure in the tunnel is about three times of the ground loading.
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https://doi.org/10.1061/(ASCE)GT.1943-5606.0001695
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