考虑渗滤液作用的填埋场边坡组合破坏稳定分析

现代卫生填埋场广泛采用复合衬垫结构,破坏面沿底坡衬垫界面和垃圾体内部的组合破坏形式是填埋场可能的失稳形态之一,相应的计算分析有待进一步完善。将潜在滑坡体划分为主动体和被动体两部分。其中,被动体沿底坡衬垫界面发生平移滑动破坏,主动体沿垃圾体内部破坏面发生转动破坏。首先,采用极限平衡理论,推导了被动体发生平移滑动时的临界启动荷载的表达式;基于极限分析上限定理,对主动体的转动破坏机制进行了分析,得到了主动体剩余下滑力的计算表达式。然后,由主、被动滑体之间的作用力相等,且考虑渗滤液水位作用的影响,提出了填埋场发生组合破坏的稳定安全系数的计算分析方法。结果表明,相比黏聚力,底坡衬垫界面的内摩擦角对填埋场稳定性的影响更为明显,因而衬垫系统的修建宜选择内摩擦角较高材料;背坡渗滤液水位越高,填埋场发生大规模失稳的可能性越大;前坡渗滤液溢出点越高,靠近填埋场前坡的浅层垃圾体越容易发生局部破坏。实际工程中,渗滤液水位的升高会严重降低填埋场的稳定性,应引起足够重视,确保填埋场的安全运营。

Stability Analysis on Composite Failure of Landfill Slope Considering the Leachate Level

With DC group formation of three circuit sending-end in Ningxia, the AC and DC cou-pling characteristics of the power grid are further strengthened, and the transient voltage increasesafter the DC failure, which can easily cause large scale off-grid of the near area wind power units. By :electromechanical and electromagnetic hybrid simulation method, the transient over voltage is simula-ted and analyzed and compared with the quantitative evaluation method of transient over voltage. Thesimulation and evaluation results show that the transient voltage will be raised significantly after thethree DC locking faults. The lifting degree is related to the locking capacity and system strength.