摘要
以厦门翔安海底隧道为依托工程,采用相似模型试验方式,研究在海水渗流场和围岩应力场共同作用下,隧道施工过程和变水头过程中,衬砌背后水压力的分布规律及受力特征.研究结果表明,隧道施工期间,在水土压共同作用下,隧道开挖对前方土体的影响范围约为2倍洞径,隧道开挖过后约1倍洞径,初期支护背后水压及应力趋于稳定;在变水头过程中,控制水的排放量对调整初期支护背后水压,保证隧道结构的安全起至关重要作用.试验所得结论与现场情况基本一致.
Based the Xia Men Xiang An sea tunnel project, the distribution of water pressure and force characteristics around the lining are studied under the effect of the water pressure and soil pressure during subsea tunnel of construction process by using the similarity model test. According to the research results, Through simulating the procedure of construction under condition of both water pressure and soil pressure, it is found that the influence scale of tunnel excavation is about 2 times of the diameter of tunnel, meanwhile, the water pressure and the stress will become stable after forward excavation length equals to the diameter of the tunnel. In the variable water head, the control of drainage plays a vital role in adjusting water pressure behind the primary support and ensuring the safety of the tunnel structure. The conclusions of model test are consistent with that of site situation.
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2012年第1期30-35,共6页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
国家自然科学基金资助项目(50878019)
关键词
海底隧道
施工过程
水压力
结构受力
模型试验
subsea tunnel
construction process
water pressure
mechanical characteristics of structure
model test
作者简介
李健（1984-），男，湖北荆州人，博士生．研究方向为隧道与地下工程．email：phdjianli@163．com．
