大直径混凝土圆筒施工期稳定性分析

Stability analysis of large-diameter concrete cylinder in construction period

深水敞式码头大直径混凝土圆筒受海域波浪作用,在施工期应验算其稳定性,以此为依据制定合理的施工处置方案。现行规范对波浪力的计算无法考虑波浪力与混凝土圆筒相互作用的三维特点,也不能反映波浪荷载周期性特点。文中采用规范方法和数值模拟相结合来分析波浪的作用,首先利用规范方法计算圆筒的滑移稳定性,确定圆筒的回填渣料;再采用线性绕射波理论分析大直径混凝土圆筒的波浪力,采用Flac3d有限差分软件分析验证了波浪力对大直径混凝土圆筒的作用。结果表明,在施工处置方案下,施工期大直径混凝土圆筒在深水域中受波浪力作用时,波浪力、圆筒与基床之间达到了相互协调平衡,整体处于稳定状态。

The large diameter concrete cylinder in deep-water open wharf is subjected to waves in the sea area. During the construction period, its stability should be checked and a reasonable construction disposal scheme should be formulated. In view of the fact that the specified method in related standard cannot cover the three-dimensional interaction between wave force and the concrete cylinder in the sea area and cannot reflect the periodic characteristics of wave loads. In this paper, the action of waves is analyzed by combining the specification method with numerical simulation. Firstly, the sliding stability of the cylinder is calculated by the specification method to determine the backfill slag, then the wave force of the large-diameter concrete cylinder is analyzed by the theory of linear diffraction wave, and the effect of wave force on the large -diameter concrete cylinder is verified by using Flac3D finite difference software. The results show that under the construction scheme, when the large diameter concrete cylinder is subjected to wave force in deep water during the construction period, the wave force, cylinder and foundation bed reach a coordinated balance, which denotes a stable state.