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草坪子隧道的出口位于草坪子滑坡体,隧道进、出口局部存在偏压问题,导致围岩应力分布条件极差。同时,受西部山区地形限制,线路展布中多处存在隧道小净距问题,隧道左右两洞在该区段内距离近,施工爆破等相互影响严重。在对地质条件和地应力分布及其熟悉之后,有针对性地对隧道爆破方案及参数分析设计并改善钻爆施工工艺、利用数值模拟来分析爆破振动特性和灾变后果,开挖隧道时爆破对其产生的影响评价和隧道控制爆破降震技术等进行了研究和探讨,最大限度降低隧道钻爆掘进施工对滑坡体及围岩稳定性的负面影响,保证隧道施工时处于安全状态,而且质量符合要求,确保如期完成施工,为今后相似工程的设计以及计算提供相应的参考资料。
The exit of the lawn tunnel is located at the Lawnzi landslide body. There is a partial bias problem at the entrance and exit of the tunnel, resulting in a very poor stress distribution condition of the surrounding rock. At the same time, due to the terrain limitation in western mountainous areas, the problem of small clear distance of the tunnel exists in many places in the line distribution. The two holes on the left and right of the tunnel are close to each other in this section and the construction blasting and so on have a serious impact on each other. After the geologic conditions and the distribution of geostress and its familiarity, we design and improve the drilling and blasting construction technology for the tunnel blasting scheme and parameter analysis in detail, analyze the blasting vibration characteristics and catastrophic consequences by numerical simulation, Its impact evaluation and tunnel blasting technology are studied and discussed to minimize the negative impact of boring and blasting tunneling on the stability of landslide body and surrounding rock and to ensure that the tunnel is in a safe state during construction and the quality is in accordance with Requirements, to ensure the completion of construction on schedule for the design and calculation of similar projects in the future to provide the appropriate reference materials.