沉管隧道底板面材质对砂流法地基影响的模型试验研究  

MODEL EXPERIMENTAL RESEARCH ON EFFECT OF MATERIAL OF IMMERSED TUNNEL BOTTOM SURFACE ON FOUNDATION FORMED BY SAND-FLOW METHOD

作　　者：莫海鸿[1,2] 黎伟[1,2] 房营光[1,2] 陈俊生[1,2] 谷任国[1,2] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641

出　　处：《岩石力学与工程学报》2012年第7期1452-1461,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51108190);广州市资助项目(GTCC2008–253);华南理工大学亚热带建筑科学国家重点实验室自主研究课题资助项目(2012ZC27)

摘　　要：通过沉管隧道足尺砂流法模型试验中采用不同模型板底面材质,获得砂盘扩展半径、压砂系统水压力、模型板底水压力随时间变化的关系曲线。分析表明:不同管节底面材质条件下,各方向试验砂盘半径扩展趋势均为二次曲线。光滑材质条件下,砂盘扩展速度较快,均衡性及充满度更佳,其砂盘最大半径可达879 cm,砂盘顶面充满度达99.3%;工程实践中为简化施工可适当增大砂盘设计半径。材质条件及砂盘扩展不影响压砂系统水压力,但对模型板底面处水压力有影响。In the full-scale model test of sand-flow method, time-history curves of sand-deposit radius, water pressure in the sand-flow system and the one under the model board are obtained under the conditions of different bottom surface materials of immersed tunnel. The analyses show that quadratic relationship exists between sand-deposit expansion trend in each direction and time under different bottom surface materials. Sand-deposit expands faster and has a better balance and fullness under the smooth material condition, with the maximum radius of 879 cm and the fullness of 99.3%, which is slightly higher than the one under the rough condition. It is feasible to increase the designed radius of sand-deposit to simplify construction. Material conditions and sand-deposit expansion do not have an effect on the water pressure of system except the one under the model board.

关 键 词：隧道工程 沉管隧道 地基处理 砂流法 足尺模型试验 底板面材质 表面粗糙度 

分 类 号：U45[建筑科学—桥梁与隧道工程]