【摘要】 在地下水丰富的砂土和粉土地区进行深基坑开挖,坑内降水施工或渗漏引起的渗透破坏问题是威胁基坑稳定性和周围环境的主要因素。通过模型试验结合数值模拟,研究了土体密实度、黏聚力、内摩擦角、桩土界面摩擦特性以及围护结构插入深度等因素对临界水力梯度以及渗透破坏模式的影响。研究表明,发生渗透破坏时的水力坡降不仅与土的密实度有关,还与土性、强度指标、桩表面粗糙度以及围护结构的插入深度等因素有关,这些结论为实际基坑工程分析提供了指导。更多还原

【Abstract】 In the area of sandy and silty soil,seepage failure is the main factor that threatens the safety of deep foundation pit and surrounding environment. Combined with numerical simulation,model experiments were performed to explore the influence of dense,cohesive strength,internal friction angle,friction behaviour and scale on the seepage phenomena of deep foundation pit in uniform sandy and silty soil. The results show that the critical hydraulic gradient not only depends on the density of soil,but also related to soil category,strength index,roughness of pile face and deepth of retaining structure. Those results can be useful.更多还原