岩溶隧道富裂隙围岩的爆破力学特性分析
发布时间：2018-09-03 06:17
【摘要】：为研究岩溶隧道富裂隙围岩爆炸过程中应力波的传播与衰减规律,运用ANSYS/LS-DYNA软件对隧道岩体中含不同充填介质、不同宽度和不同爆源距离的岩溶裂隙进行了数值模拟。结果表明:爆炸应力波在岩溶裂隙处的传播主要受裂隙内充填介质的物理力学性质的影响,其次受到裂隙宽度、爆源与裂隙距离和爆源强度等因素的影响。充填介质的强度越小,波阻抗也越小,对介质中应力波的阻隔作用则越大。裂隙与爆源的距离越远,爆源强度越小,有效应力峰值也越小。裂隙越宽,对应力波的削弱越大。结合该结论对岩溶隧道裂隙围岩在爆破过程中出现的实际问题进行分析,找出了影响爆破效果的关键因素,通过调整爆破设计参数,得到了不同裂隙围岩条件下爆破参数参考值,经现场测试取得了较好的爆破效果,研究结果可为类似条件下的隧道爆破参数的优化提供理论依据和参考。
[Abstract]:In order to study the law of stress wave propagation and attenuation in the explosion process of fractured rock mass in karst tunnel, the numerical simulation of karst fracture with different filling medium, different width and different explosion source distance in tunnel rock mass was carried out by using ANSYS/LS-DYNA software. The results show that the propagation of explosive stress wave in karst fracture is mainly affected by the physical and mechanical properties of the filling medium in the fracture, and then by the crack width, the distance between the source and the crack, the strength of the explosion source, and so on. The smaller the strength of the filling medium, the smaller the wave impedance, and the greater the barrier to the stress wave in the medium. The farther the distance between fracture and explosion source is, the smaller the strength of detonation source is and the smaller the peak value of effective stress is. The wider the crack, the greater the weakening of the corresponding force wave. Combined with this conclusion, the practical problems in blasting process of fractured surrounding rock in karst tunnel are analyzed, the key factors affecting blasting effect are found out, and the blasting design parameters are adjusted. The reference values of blasting parameters are obtained under the conditions of different fissure surrounding rocks, and good blasting results are obtained by field test. The results can provide theoretical basis and reference for the optimization of blasting parameters of tunnels under similar conditions.
【作者单位】： 长沙理工大学土木与建筑学院;长沙理工大学桥梁工程湖南省高校重点实验室;新余学院建筑工程学院;
【基金】：国家自然科学基金(51278071,51308072) 长沙理工大学桥梁工程湖南省高校重点实验室开放基金资助项目(15KA03)
【分类号】：U455.6;U451.2
[Abstract]:In order to study the law of stress wave propagation and attenuation in the explosion process of fractured rock mass in karst tunnel, the numerical simulation of karst fracture with different filling medium, different width and different explosion source distance in tunnel rock mass was carried out by using ANSYS/LS-DYNA software. The results show that the propagation of explosive stress wave in karst fracture is mainly affected by the physical and mechanical properties of the filling medium in the fracture, and then by the crack width, the distance between the source and the crack, the strength of the explosion source, and so on. The smaller the strength of the filling medium, the smaller the wave impedance, and the greater the barrier to the stress wave in the medium. The farther the distance between fracture and explosion source is, the smaller the strength of detonation source is and the smaller the peak value of effective stress is. The wider the crack, the greater the weakening of the corresponding force wave. Combined with this conclusion, the practical problems in blasting process of fractured surrounding rock in karst tunnel are analyzed, the key factors affecting blasting effect are found out, and the blasting design parameters are adjusted. The reference values of blasting parameters are obtained under the conditions of different fissure surrounding rocks, and good blasting results are obtained by field test. The results can provide theoretical basis and reference for the optimization of blasting parameters of tunnels under similar conditions.
【作者单位】： 长沙理工大学土木与建筑学院;长沙理工大学桥梁工程湖南省高校重点实验室;新余学院建筑工程学院;
【基金】：国家自然科学基金(51278071,51308072) 长沙理工大学桥梁工程湖南省高校重点实验室开放基金资助项目(15KA03)
【分类号】：U455.6;U451.2
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