CAJ | 학술논문

为了分析爆炸动荷载对巷道围岩不同位置处缺陷扰动的影响，采用爆炸加载透射式动焦散试验方法进行了相关试验研究。试验结果表明：在爆炸动荷载作用下，位于巷道顶端的竖直裂纹最易扩展，拱部和底角处倾斜裂纹较易发生扩展，巷帮处水平裂纹不易扩展，扩展位移分别为31，17，20，6 mm；裂纹扩展位移的大小与应力强度因子值密切相关，巷道顶部裂纹KⅠ值最大，拱部和底角处倾斜裂纹的KⅠ值次之，巷帮处水平裂纹的KⅠ值最小。上述研究成果对减少爆破动载荷对围岩的扰动和损伤、节约围岩的支护成本、保证安全施工和快速施工有重要意义。
위료분석폭작동하재대항도위암불동위치처결함우동적영향，채용폭작가재투사식동초산시험방법진행료상관시험연구。시험결과표명：재폭작동하재작용하，위우항도정단적수직렬문최역확전，공부화저각처경사렬문교역발생확전，항방처수평렬문불역확전，확전위이분별위31，17，20，6 mm；렬문확전위이적대소여응력강도인자치밀절상관，항도정부렬문KⅠ치최대，공부화저각처경사렬문적KⅠ치차지，항방처수평렬문적KⅠ치최소。상술연구성과대감소폭파동재하대위암적우동화손상、절약위암적지호성본、보증안전시공화쾌속시공유중요의의。
In order to analyze the influence of the blasting dynamic load on defects extension of road-way surrounding rock in different locations, the explosion load system using dynamic reflected caustics has been used to conduct the organic glass model experimental study. The experimental results have shown that under the influence of dynamic load the vertical crack at the top of the roadway is easier to extend than others, then are the inclined cracks at the arch and the corner,and the last ones are the ho-rizontal cracks with the data of cracks propagation length of 31,17,20 and 6 mm respectively. The value of the displacement of crack propagation has a direct relationship with the value of the stress in-tensity factor and we can see that the value of the stress intensity factor of the vertical crack at the top of the roadway is greater than that of other three cracks, then is the value of the inclined cracks at the arch and corner and the value of the horizontal crack is at the minimum level. The above research results have positive influence on reducing the disturbance and damage of the blasting dynamic load on sur-rounding rock, and on saving the cost of surrounding rock supporting, ensuring construction safely and rapidly.