水电站地下厂房大型岩体洞室的抗爆性能

通过大量的数值模拟试验,以洞室岩体和混凝土衬砌结构的损伤为指标,研究了水电站地下厂房这类大型岩体洞室在强地表爆破荷载作用下,洞室埋深、围岩岩体强度和地应力对洞室抗爆性能的影响。数值计算中,洞室岩体和混凝土衬砌均采用弹塑性损伤本构模型,同时考虑了几何非线性效应。研究结果表明:对于水电站地下厂房这类高边墙洞室,浅埋深洞室的抗爆性能较差,深埋深洞室的抗爆性能较强;岩体强度越高,洞室的抗爆性能越强;当地应力侧压因数λ1时,随地应力侧压因数的增大,洞室的抗爆性能显著下降。 更多还原

Blast resistance of large underground rock caverns in hydraulic power stations

In order to fully realize the blast resistance of this kind of rock cavern, a great many 3D nonlinear finite element numerical simulations were implemented. Taking the damage of surrounding rock and concrete liner as evaluation criterion, the influence of embedded depth, rock property and lateral pressure coefficient on the blast resistance of the cavern was analyzed. The damaged plasticity model was adopted for the rock and concrete liner. Geometric nonlinear behaviors were also considered in every simulation. For this kind of high-wall cavern in a hydraulic power station, numerical results indicate that the blast resistance of the shallow cavern is weaker than that of the deep embedded cavern. The stiffer the surrounding rock, the stronger the blast resistance of the cavern. Numerical results also indicate that when the geo-stress lateral pressure coefficient λ is less than 1, the geo-stress lateral pressure coefficient affects weakly the blast resistance performance of the cavern. Once λ is greater than 1, the blast resistance of the cavern dramatically decreases with the increase of λ.