【摘要】 受汶川地震的影响,经过断层带的公路隧道在施工时更容易出现大的塌方事故。为避免造成人员伤亡和经济损失,本文以广甘高速公路杨家山隧道右洞桩号K22+624段塌方为工程背景,采用现场地质描述分析、地质雷达探测,以及编写程序的正演模拟相结合,对汶川地震过后断层带对隧道塌方的影响进行研究。结果表明,在震后断层带的影响范围内,围岩整体特性发生突变,雷达波形图中会形成强烈的反射波信号,经过后期处理,能够得到较为清晰的波形异常图,从而推测出掌子面前方可能出现塌方的情况。文章最后对地质雷达探测加以正演模拟,可有效地指导整个隧道施工过程,并取得较好的经济收益。更多还原

【Abstract】 Earthquakes are prone to trigger large collapses during the construction of highway tunnels in fault zones.To avoid casualties and economic losses,the effects of the Wenchuan earthquake on the Yangjiashan Tunnel of the Guanggan highway were examined by using the section at K22 + 624 as an example.A combination of geological field description analysis,geological radar detection techniques and program forward modeling were used in this study.The results showed that the overall properties of the surrounding rock mutated and a strong reflected wave signal formed in the radar waveform pattern within the scope affected by the fault zone after the earthquake.After optimization and post-processing,the establishment of a clear anomaly waveform map was possible;this map was then used to form a conjecture regarding the collapse that may occur in front of the working face.Finally,the forward modeling of this work was undertaken;this can be used effectively to guide the entire tunnel construction process and to obtain better economic returns.更多还原