顶管洞口止水装置密封性数值模拟研究

Numerical Simulation on Sealing Perfo

依据顶管施工现场常用的帘布橡胶板+折页压板组合防水装置,利用ABAQUS软件建立了简化二维平面模型,通过改变橡胶板、折页压板以及材料硬度的参数大小,研究了该防水装置的密封性规律,并提出了密封性评价标准与最优组合形式。研究表明,通过采用帘布橡胶板+折页压板组合的密封装置能够有效地避免洞口处漏水漏砂现象。但是橡胶板过长或折页压板过短将降低端头有效接触应力;过短的橡胶板或过长的折页压板会使橡胶板端头位置应力集中,有效接触长度较小;同时过高的硬度也会使端头位置应力集中,有效接触长度减小。这些情况下密封性均将下降。

A simplified two-dimensional plane model was established by using ABAQUS software based on the curtain rubber plate+folding plate combined waterproof device commonly used in the pipe jacking construction site.By changing the parameters of the rubber plate,folding plate,and material hardness,the sealing law of the waterproof device was studied,and the sealing evaluation standard and optimal combination form were proposed.The research shows that the sealing device with the combination of curtain rubber plate and folding plate can effectively avoid the phenomenon of water and sand leakage at the hole.However,if the rubber plate is too long or the folding plate is too short,the effective contact stress of the end will be reduced.Too short a rubber plate or too long a folding plate will cause stress concentration at the end of the rubber plate,and the effective contact length is small.At the same time,too high hardness will also cause stress concentration at the end position and reduce the effective contact length.In these cases,the sealing performance will decrease.