外交叉锚固洞室抗爆性能数值模拟  

Numerical Simulation of the Anti-explosion Performance of Underground Caverns Reinforced by External Cross-anchoring

作　　者：王亚军[1] 陈太林[1] 郭常颖[1] 王建军 

机构地区：[1]空军勤务学院机场系,江苏徐州221000 [2]中国航空港建设总公司第七总队,陕西宝鸡721006

出　　处：《地下空间与工程学报》2015年第3期680-686,共7页Chinese Journal of Underground Space and Engineering

摘　　要：目前,国内外针对洞室锚固结构抗爆性能的研究主要集中于爆炸波在岩土介质中的传播特性、对围岩的破坏作用、锚喷支护内加固效果分析等方面,很少涉及对外加固效果的研究。笔者为研究薄被覆层条件下外锚固结构对地下洞室抗爆性能的效果,在模型试验的基础上,利用FLAC3D建立无锚固和外交叉锚固两种三维整体式有限元模型,模拟洞室在爆炸荷载作用下的响应。结果表明:洞室加固前后侧墙破坏区域基本相同,但加固后其拱顶的位移、破坏长度和破坏面积明显减小;加固后洞室周围应力集中区域缩小,主应力明显降低,各部分动应变趋向均匀;加固后洞室压应力与反射拉应力出现的时刻延后,应力波传播速度减缓。研究结果和该有限元预测方法可为地下洞室抗爆设计提供参考。Up to present moment,the domestic and foreign studies on the anti-explosion performance of the anchoring structure used in cavern were mainly focused on the transmission characteristics of the blast wave in geotechnical media,its damage to the surrounding rock and analysis of the reinforcement effect of rock bolt and shotcrete inside,etc.,but the reinforcement effect outside was rarely involved in this field. The objective of this paper is exactly to assess the effect of anchoring structure outside on anti-explosion of cavern under the condition of thin coating layer. On the basis of model test,FLAC3 D was used to establish two kinds of three-dimensional integrated finite element models,one was reinforced by external cross-anchoring but the other wasn＇t. The responses of underground cavern under blast loading were simulated. It showed that whether or not it was reinforced,the destruction area of the side wall was basically the same,but the displacement of its vaulted dome,destruction length and damage area were decreased significantly for the reinforced one; the stress concentrated area reduced,principal stress significantly decreased,dynamic strain of the parts tended to be uniform; the moment of compressive stress and reflecting tensile stress appearance delayed,the stress wave propagation slowed. The conclusions above and this FEM prediction provided a reference for anti-explosion design in underground caverns.

关 键 词：锚索 加固 洞室 抗爆 

分 类 号：O319.56[理学—一般力学与力学基础]