CAJ | 학술논문

为研究隧道预加固管棚水平旋喷桩组合结构中管棚的力学行为、管棚搭接处的受力特点，采用三维弹塑性有限元方法，对比分析在开挖过程中，管棚水平旋喷桩组合结构和超前管棚注浆结构中管棚的轴应力、剪应力、弯矩分布特点.结果表明：管棚水平旋喷桩组合结构中，钢管所受弯矩和剪应力约为超前管棚注浆结构的10％，所受轴应力约为超前管棚注浆结构的40％；钢管的受力特点与超前管棚注浆结构存在较大差异.2种结构的管棚搭接处的力学行为均较为特殊，在分析管棚水平旋喷桩组合结构中钢管的受力情况，或对超前管棚注浆结构考虑管棚搭接效应进行受力分析时，应将现有受力简化模型进行修正.
위연구수도예가고관붕수평선분장조합결구중관붕적역학행위、관붕탑접처적수력특점，채용삼유탄소성유한원방법，대비분석재개알과정중，관붕수평선분장조합결구화초전관붕주장결구중관붕적축응력、전응력、만구분포특점.결과표명：관붕수평선분장조합결구중，강관소수만구화전응력약위초전관붕주장결구적10％，소수축응력약위초전관붕주장결구적40％；강관적수력특점여초전관붕주장결구존재교대차이.2충결구적관붕탑접처적역학행위균교위특수，재분석관붕수평선분장조합결구중강관적수력정황，혹대초전관붕주장결구고필관붕탑접효응진행수력분석시，응장현유수력간화모형진행수정.
To investigate the mechanical behaviors of pipe roof inside horizontal j et-grouting pile composite structure and the pipe mechanical characteristics in overlapping area,3D elastic-plastic finite element method was used to comparativly analyze the axial stress,the shear stress and the bending moment distri-bution characteristics of steel pipes in horizontal j et-grouting pile composite structure and pipe roof struc-ture,in the process of the excavation.The results indicate that there are large gaps on the mechanical char-acteristics of steel pipes for horizontal j et-grouting pile composite structure and steel pipe roof structure.In the horizontal jet-grouting pile composite structure,steel pipes bear only 10% bending moment and shear stress and 40% axial stress of that of the steel pipe roof structure.The steel pipe mechanical behavior changes in the overlapping area as well.The existing simplified mechanical model of steel pipes should be modified when mechanical characters are investigated for either the steel pipe in j et-grouting composite structure or in the pipe roof structure considering the overlapping effect.