摘要
反压抢险施工简便,在盾构隧道涌水涌砂事故抢险中应用广泛。但目前对反压抢险的研究不足,对反压原理的认识还不清晰,对抢险过程中砂袋反压高度的取值并不明确。文章首先采用能量守恒公式对反压原理进行分析,发现实施反压后渗漏点处流量减小,进入隧道的总涌水量减少;反压高度越高,水头损失越大,砂袋边缘出渗流速越小。进一步建立简化的反压高度计算模型,并推导反压所需砂袋高度的计算公式。结果表明:砂袋反压所需高度与砂袋堆积体的渗透系数、渗漏点半径、渗漏口总水头呈正相关。
Water inrush accidents often occur in shield tunnel construction.Back-filling is simple and widely used in emergency rescue.At present,the research on Back-filling is insufficient,and the understanding of the principle of Back-filling is not clear.Using energy conservation formula it analyzes the principle of Back-filling.And it establishes a simplified Back-filling model and deduces the formula to calculate the sandbags height for a certain waterhead of Back-filling.The results show that after the implementation of Back-filling,the flow decreases at the leakage point,and the total water inflow into the tunnel decreases.The higher the sandbags,the greater the waterhead loss and the smaller the seepage velocity at the edge of the sandbags.The height of sandbags is positively correlated with the permeability coefficient of sandbags,the radius of leakage point and the total waterhead of leakage point.
作者
柳献
范森
孙齐昊
LIU Xian;FAN Sen;SUN Qihao(Department of Geotechnical Engineering,Tongji University,Shanghai 200092)
出处
《现代隧道技术》
CSCD
北大核心
2022年第S01期340-344,共5页
Modern Tunnelling Technology
基金
国家自然科学基金资助项目(52078376)
关键词
隧道涌水灾害
砂袋反压
反压原理
反压高度
Water inrush accident in tunnel
Sandbags Back-filling
Back-filling principle
Back-filling height
