Nonlinear finite element analysis of tunnel excavation and anchor sprayed concrete lining construction process within hard rock mass 硬岩隧道锚喷支护施工过程非线性有限元分析
Then a research is carried out on strengthening the tunnel crack lining by using the steel arching structure and shotcrete anchor. An analysis result of stress and deformation of steel arching structure supports the lining strengthening design. 其次研究钢拱架与喷锚相结合加固隧道衬砌裂损的技术措施,通过分析钢拱架受力与变形,为裂损衬砌的加固设计提供依据;
Comprehensive measures are adopted including anti-slide piles and micro-piles with anchor bars for the surface, lead tremie grouting inside tunnel, strengthened support with I-steel, prestressed anchor bar, and improved cross section of lining, which achieved good results. 设计采用地表抗滑桩和微型桩,洞内超前小导管注浆、密排工字钢架加强支护、预应力锚杆,并优化衬砌断面型式等措施,在施工中取得了较好的效果。
And the equivalent nonlinear stiffness spring is used to model the slip relationship between the anchor and the cement around. The nonlinear material behavior of anchor and the concrete and the interaction between the lining structure and the rock are also considered in the analysis. 采用等效刚度非线性弹簧模拟锚杆和混凝土之间的粘结滑移关系,并考虑了锚杆的非线性材料特性,以及支护结构和围岩之间的相互作用。
Many site tests have also proved that the strength of anchor and shotcrete support is much greater than that of conventional in situ concrete lining. 通过多次现场试验也证明:喷锚支护比现浇混凝土的支护能力在相同条件下要大得多。
The use of structural mechanics and the theory of elastic foundation beam and so on shell structure analysis of spray anchor, surface of the shell in accordance with principles of mechanics of the shell structure of bolting and shotcrete lining study, internal force calculation formula is derived. 利用结构力学和弹性理学等力学理论对三维钢筋网架锚喷支护结构进行研究,根据壳体的力学原理对三维钢筋网架锚喷支护结构进行分析,推导出内力计算式。