填埋场封场覆盖系统稳定性统一分析模型构建及应用研究  

Construction of consistent stability analysis model of landfill cover system and its application

作　　者：万勇[1] 薛强[1] 陈亿军[1] 张乾[1] 赵颖[1] 刘磊[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071

出　　处：《岩土力学》2013年第6期1636-1644,共9页Rock and Soil Mechanics

基　　金：国家973项目(No.2012CB719802);国家重大水专项课题(No.2011ZX07104-002-02);国家自然科学基金(No.51079143)

摘　　要：为探讨不同界面形式下有限长与无限长填埋场边坡封顶覆盖系统稳定特性,通过模型试验确定了不同边坡长度下界面分别为土工膜和三维网时封场覆盖系统的破坏模式与失稳坡度。基于试验结果建立了覆盖系统的许可破坏模式及其速度场,利用极限分析上限法建立了考虑界面强弱特性以及坡长有限与无限形式的覆盖系统稳定性统一分析模型,并利用模型试验结果对该理论进行验证。运用文中提出的理论模型对新型环保的垃圾填埋场封场覆盖生态污泥腾发覆盖技术(EST)中防护基材稳定性进行定量分析。研究结果表明:覆盖层失稳时,滑移面分为上、下两段,上段为平行于坡面的直线,下段为位于覆盖层内部近似为与坡面成一定夹角的直线;减小边坡长度能使覆盖系统稳定特性提高,但减小覆盖层厚度对覆盖系统稳定的增减影响与界面强弱形式有关;覆盖系统稳定特性主要由界面抗剪强度控制,增加基材强度并不能大幅度提升覆盖系统稳定特性,且增加界面黏聚力对覆盖系统稳定贡献明显优于增加界面摩擦系数。To investigate stability characteristics of landfill cover system with different slope length types （i.e. finite length or infinite length）, and different interface types （i.e.weak interface or strong interface）, the failure mode of landfill cover with different slope length types and different interface types at limit state is obtained by model test. Based on the test results, an allowable landfill cover failure mode and the velocity field are established. Meanwhile, the consistent stability analysis model is obtained by using the upper-bound solution theory, which agrees well with those from the model tests. The stability of new environmental protection technology of ecological sludge evapotranspiration technology （EST） is studied by this model. The results show that： the upper part of the failure plane is straight, which is under the carrying soil and parallel with original slope surface; but the lower part is approximate straight line connected with the upper-part with a angle. With decreasing the length of slope, the safety factor of cover system will be increased; but the relation between thickness and safety factor of cover system is to be related to interface types. The stability of cover system is mainly controlled by shear strength of interface; and it is not obvious to increasing the safety factor of cover system by increasing substrate shear strength; it is better to increase the safety factor of cover system by increasing the cohesion of interface than increased the internal frictional angle of interface.

关 键 词：填埋场 覆盖系统 模型试验 稳定 极限分析上限法 EST技术 

分 类 号：O344.5[理学—固体力学]