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针对两侧深槽一侧已开挖形成临空面的中隔墩爆破开挖,分析了爆破冲击荷载作用下中隔墩岩体产生的振动、应力、位移等动力响应,并改善了爆破开挖方式,优化了开挖程序。研究表明,爆破冲击荷载作用下中隔墩岩体的动力响应是由于爆破应力波的反射与叠加;通过选取适当的预留岩体厚度,可以合理地利用爆破应力波的反射与叠加,削弱爆破冲击荷载作用下中隔墩的动力响应,进而降低中隔墩因爆破开挖出现动力失稳的风险,其研究成果对工程实践具有重要的指导意义。
In view of the excavation of the septum pier with the excavation of the freeboard on both sides of the deep groove side, the dynamic responses such as vibration, stress and displacement of the rock mass under the impact of blasting impact are analyzed, and the blasting open Digging methods to optimize the excavation process. The research shows that the dynamic response of the diaphragm pier under blasting impact load is due to the reflection and superposition of the blasting stress wave. By selecting the appropriate thickness of the reserved rock mass, the reflection and superposition of the blasting stress wave can be reasonably utilized to weaken the blasting The dynamic response of the diaphragm pier under the impact load can reduce the risk of the dynamic instability of the middle pier due to the blasting excavation. The research results have important guiding significance for engineering practice.