结构工程师
結構工程師
결구공정사
STRUCTURAL ENGINEERS
2014年
3期
129-136
,共8页
填埋场衬垫系统%界面本构模型%剪应力%剪切位移
填埋場襯墊繫統%界麵本構模型%剪應力%剪切位移
전매장츤점계통%계면본구모형%전응력%전절위이
landfill liner system%interface constitutive model%shear stress%shear displacement
垃圾填埋场底部衬垫系统中黏土-土工膜（GM）界面和土工织物（GT）-土工膜界面的剪切强度较低，极易沿界面发生失稳破坏。提出三阶段界面本构模型描述界面的软化特性，采用有限差分程序建立计算模型，研究了垃圾体弹性模量、密度、高度和背坡坡度变化对界面剪应力和剪切位移的影响。分析结果表明：随着垃圾体弹性模量的增加，基地处界面剪切位移和剪应力均逐渐增大，而背坡处界面剪切位移和剪应力逐渐减小；随着垃圾体密度和填埋高度的增加，界面剪应力和剪切位移均逐渐增大，而背坡坡度对界面剪切位移影响较大；通过 GT/GM界面和 GM/地基土界面剪应力和剪切位移的对比分析可知，界面失稳破坏往往发生在抗剪强度较小的界面。
垃圾填埋場底部襯墊繫統中黏土-土工膜（GM）界麵和土工織物（GT）-土工膜界麵的剪切彊度較低，極易沿界麵髮生失穩破壞。提齣三階段界麵本構模型描述界麵的軟化特性，採用有限差分程序建立計算模型，研究瞭垃圾體彈性模量、密度、高度和揹坡坡度變化對界麵剪應力和剪切位移的影響。分析結果錶明：隨著垃圾體彈性模量的增加，基地處界麵剪切位移和剪應力均逐漸增大，而揹坡處界麵剪切位移和剪應力逐漸減小；隨著垃圾體密度和填埋高度的增加，界麵剪應力和剪切位移均逐漸增大，而揹坡坡度對界麵剪切位移影響較大；通過 GT/GM界麵和 GM/地基土界麵剪應力和剪切位移的對比分析可知，界麵失穩破壞往往髮生在抗剪彊度較小的界麵。
랄급전매장저부츤점계통중점토-토공막（GM）계면화토공직물（GT）-토공막계면적전절강도교저，겁역연계면발생실은파배。제출삼계단계면본구모형묘술계면적연화특성，채용유한차분정서건립계산모형，연구료랄급체탄성모량、밀도、고도화배파파도변화대계면전응력화전절위이적영향。분석결과표명：수착랄급체탄성모량적증가，기지처계면전절위이화전응력균축점증대，이배파처계면전절위이화전응력축점감소；수착랄급체밀도화전매고도적증가，계면전응력화전절위이균축점증대，이배파파도대계면전절위이영향교대；통과 GT/GM계면화 GM/지기토계면전응력화전절위이적대비분석가지，계면실은파배왕왕발생재항전강도교소적계면。
The shear strength of geomembrane /clay interface and geomembrane /geotextile interface in the landfill liner systems are very low,which will result in the instability failure of the landfill.Three phases inter-face constitutive model is developed to describe the softening characteristic of these interfaces.Then,using the finite difference software,the effects of various parameters on the interface shear stress and displacement are analysed The results show that with the increase of elastic modulus,the interface displacement and shear stress increase at the base,while decreasing at the black slope.Landfill height and waste density have the same effects on the interface displacement and shear stress.And the back slope gradient has great effect on the in-terface displacement.The comparative analysis of GT/GMand GM/soil interfaces shows that the failure gener-ally occurs at the interface with smaller shear strength.
