CAJ | 학술논문

针对弧底梯形断面渠道，考虑复合土工膜和渠基土壤的摩擦力，通过分析复合衬砌渠道的冻胀破坏机理，指出弧底梯形复合衬砌渠道坡板可简化为在冻胀力、冻结力、摩擦力共同作用下的悬臂梁，整个衬砌体属于压弯组合变形结构。通过适当的假设和简化，建立了弧底梯形复合衬砌渠道冻胀破坏力学模型，分别求出渠道坡板和弧形底板内力表达式，并对衬砌板的厚度进行验算。对比混凝土渠道，加入复合土工膜后，衬砌体产生允许范围内的冻胀位移量，使渠基土壤对衬砌体的有效冻胀力和有效冻结力减小，改善了衬砌体本身的受力状态，起到防冻胀破坏的作用，揭示了复合衬砌渠道防冻胀破坏的机理；对比梯形渠道，认为弧底梯形渠道坡板与底板整体结构性更强，反拱作用明显，更有利于渠道的防冻胀破坏。
침대호저제형단면거도，고필복합토공막화거기토양적마찰력，통과분석복합츤체거도적동창파배궤리，지출호저제형복합츤체거도파판가간화위재동창력、동결력、마찰력공동작용하적현비량，정개츤체체속우압만조합변형결구。통과괄당적가설화간화，건립료호저제형복합츤체거도동창파배역학모형，분별구출거도파판화호형저판내력표체식，병대츤체판적후도진행험산。대비혼응토거도，가입복합토공막후，츤체체산생윤허범위내적동창위이량，사거기토양대츤체체적유효동창력화유효동결력감소，개선료츤체체본신적수력상태，기도방동창파배적작용，게시료복합츤체거도방동창파배적궤리；대비제형거도，인위호저제형거도파판여저판정체결구성경강，반공작용명현，경유리우거도적방동창파배。
The composite lining canal is a kind of lining form which combine compound geomembrane and concrete lining structure. In order to improve the performance of the canal of anti-freezing expansion damage, aimed at the lining trapezoidal canal with arc-bottom, the friction of the compound geomembrane and the concrete lining structure are considered. By analyzing the damage mechanism of frost-heaving on the concrete lining of the channel with arc-bottom section, it has been indicated that the slope lining is seen as a cantilever beam under the function of frost-heaving force, frozen force and the friction. Further, it has been found that the slope lining plate and the bottom lining plate are combined deformation members under the loads of bending and compressing. The mechanics models of frost-heaving damage of composite lining canal with arc-bottom are built. The internal forces of the canal slope lining plate and the canal bottom lining plate with arc-bottom are solved and the thickness of the lining plates are assessed. Compared with the concrete canal, the tangential force of constraint of the lining canal is reduced by adding the compound geomembrane because of a number of allowable displacements of frost heave. The stress condition of the lining structure itself is improved, and the distribution of the frost-heave capacity is more balanced. These have played an important role in anti-freezing expansion damage and have disclosed the mechanism of frost-heaving damage. Compared with the trapezoidal canal, the integration of the lining canal with arc-bottom combined with the slope lining plate and the bottom lining plate is better because of its anti-arching effect is obvious and it' s of more benefit to anti-freezing expansion damage. To sum up, this study provides some theory basis for the technology of anti-freezing expansion damage of the compound lining canal.