摘要
针对宁波地区承压水含砂地层中地连墙槽壁失稳问题,利用现场试验和有限元计算方法,对减压降水辅助成槽施工及对周边环境的影响进行了研究。结果表明:与无辅助措施相比,减压降水可明显提高槽壁的稳定性,随降深的增加效果愈好,且成槽后12h槽壁依然保持良好。减压降水辅助成槽试验期间对周边环境影响较小,停止降水后地表沉降有约30%的恢复。最后,对比得到了最优的降深、井深、井间距、抽水量等关键参数。
According to the instable problems occurred during the construction of diaphragm wall in Ningbo area, where the confined water exists in sandy layers, the trench construction through pressure reduction dewatering and its effect on the surrounding areas are investigated by using field test and FEM analysis. Test results show that the effect of pressure reduction dewatering on the environment is very little, nearly 30% of the ground settlement recovered after the dewatering stopping. Compared with nonassisted construction, the stability of the trench can be improved significantly by pressure reduction dewatering, when the effect of dewatering improves as the dewatering depth increases, the trench can last for 12 hours after the excavation. Finally, appropriate parameters such as the depth of dewatering, depth of well, the distance between wells, the pumpage and so on are obtained.
出处
《城市轨道交通研究》
北大核心
2013年第5期115-120,127,共7页
Urban Mass Transit
关键词
减压降水
地下连续墙
承压水
dewatering confined water
diaphragm wall
confined water
