深埋隧道喷射钢纤维混凝土支护的数值模拟

为了研究钢纤维喷射混凝土在深埋隧道衬砌中的应用,了解钢纤维喷射混凝土在深井软岩隧道中的支护效果,对不同类型纤维及不同纤维含量下的钢纤维混凝土试件分别进行了抗压、劈裂抗拉、抗剪及弯曲韧性4种室内试验。在试验的基础上进行FLAC3D三维模拟。模拟结果可知:隧道经混凝土初砌后,剪切破坏区明显减少,钢纤维混凝土比普通混凝土有着更好的支护效果,顶底及两帮移近量较普通混凝土降低约7%。通过与现场实测数据的对比,证实该数值模拟结果与实测数据较为吻合,数值模拟的方法可为钢纤维混凝土在深埋隧道衬砌中的推广应用提供参考。更多还原

Numerical Simulation for Sprayed Steel Fiber Concrete Supporting in Deep-buried Tunnel

In order to study the application of sprayed steel fiber concrete in deep-buried tunnel lining and understand its supporting effect in deep soft rock tunnel,4 kinds of indoor tests such as the compressive,splitting tensile and shear strength as well as flexural toughness are carried out for the steel fiber concrete specimens under different fiber types and different fiber contents,then,on the basis of the tests,the three dimensional simulation of FLAC3D is made.The results show that after the lining of the tunnel,its shear failure area is reduced significantly,the supporting effect of the stee fiber concrete is better than that of common concrete,and the nearer amount in the top and bottom and two sides of the steel fiber concrete is reduced about 7% than that of common concrete.Through comparison,it is confirmed that the numerical simulation results are coincident with the measured data.The numerical simulation method here could provide some references for the popularization and application of the steel fiber concrete in deep-buried tunnel lining.