CAJ | 학술논문

本文以西安地铁区间隧道为工程背景，采用理论分析、数值模拟与现场试验等研究手段，基于收敛‐约束法原理对现行支护参数安全性进行评价，得到结论如下：黄土地层特征曲线可分为直线与曲线段，洞周边墙地层首先发生屈服，并逐渐形成塑性滑移楔体向拱顶和拱底蔓延；复合式支护结构中各构件以并联方式共同承担地层压力；支护结构进入塑性状态后其力学性能急剧恶化，由于施工与运营不允许支护结构出现塑性屈服，本文从容许位移的角度提出定义支护结构安全系数的方法；现场试验中支护结构能提供的最大支护反力大于围岩与支护特征曲线平衡点应力，表明现行支护参数满足安全性要求；从容许位移角度提出支护结构安全性评价方法，通过有限元计算结果绘制相关部分的地层与支护特征曲线可得对应安全系数，计算表明隧道支护结构安全系数最小为边墙处1.14，设计与施工中应予关注。
본문이서안지철구간수도위공정배경，채용이론분석、수치모의여현장시험등연구수단，기우수렴‐약속법원리대현행지호삼수안전성진행평개，득도결론여하：황토지층특정곡선가분위직선여곡선단，동주변장지층수선발생굴복，병축점형성소성활이설체향공정화공저만연；복합식지호결구중각구건이병련방식공동승담지층압력；지호결구진입소성상태후기역학성능급극악화，유우시공여운영불윤허지호결구출현소성굴복，본문종용허위이적각도제출정의지호결구안전계수적방법；현장시험중지호결구능제공적최대지호반력대우위암여지호특정곡선평형점응력，표명현행지호삼수만족안전성요구；종용허위이각도제출지호결구안전성평개방법，통과유한원계산결과회제상관부분적지층여지호특정곡선가득대응안전계수，계산표명수도지호결구안전계수최소위변장처1.14，설계여시공중응여관주。
With regional tunnel in Xi′an metro as the project background , by means of theoretical analysis , site experiment and finite element numerical calculation , the safety for support parameters was evaluated based on convergence‐confinement method . The results showed that :(1)The characteristic curve of the loess stratum can be divided into straight line and curve segments . Yield first occurred at sidewall surrounding the tunnel and plastic slip wedge gradually formed extending to the vaults and arch bottom ;(2)All the components in the composite support structure were in parallel to bear the pressure of surrounding rock ;(3)The mechanical properties of supporting structure in a plastic state were deteriorated sharply . As plastic yield was not allowed in the supporting structure during the construction and operation , this paper proposed the method of defining the safety factor of supporting structure from the perspective of allowed displacement ;(4)The maximum reac‐tion force that the supporting structure provided during the field test was greater than the stress of the equilib‐rium point between surrounding rock and supporting characteristic curve , showing that current supporting pa‐rameters met the safety requirements ;(5)The safety evaluation method for supporting structure was proposed from the perspective of the permissible displacements . Through the finite element calculation results , the cor‐responding strata and support characteristic curves were drawn to obtain corresponding safety factors . The cal‐culation showed that the minimum safety factor of the tunnel support structure was 1.14 at the sidewall ,which should receive attention during design and construction .