南水北调中线工程永年县湿陷性黄土地基渠段有限元分析

摘要

南水北调填方渠道湿陷性黄土破坏使渠道产生变形，对总干渠通水运行产生影响，需进行处理。利用黄土湿陷经验模型、变形倾度法等对永年县湿陷性黄土地基渠段进行有限元分析计算。结果显示湿陷区域的大小对堤身因湿陷造成的沉降有较大影响，裂缝产生位置对工程安全无明显影响，考虑实际地基分布，采取强夯等处理措施后，能够保证渠道的运行安全。通过工程实例计算，说明提出的方法可用于湿陷性黄土地基安全分析。%Damage of collapsible loess may cause the leakage of channels and exert an influence on economy and safety of Main Canal Water Distribution .Therefore ,collapsible loess needs to be processed .By using collapsible loess empirical model ,deformation inclination method ,a finite element model of the collapsible loess foundation of Yongnian County was developed .The results showed that the size of the area collapsible have huge impacts on the settlement ,cracks position had no significant effect on the safety of the project ,considering the distribution of the actual foundation ,measures such as compaction and other treatment should be taken to ensure the safe operation of the channel .According to the case study ,the proposed method can be used when dealing with collapsible foundation safety analysis .