成兰铁路特长深埋隧道岩爆段应力特征

为了探究高地应力环境下深埋隧道岩爆发生机理,掌握岩爆孕育规律,通过现场测试、数值分析及室内实验,对平安特长深埋隧道岩爆段围岩的二次应力场进行了分析,探明了隧道岩爆发生的力学机制,并运用经典应力岩爆判据指标,预测判断出岩爆发生强度及位置。研究表明：隧道侧壁处存在较大的压应力,是造成岩爆发生的主要原因;高地应力条件下,由于结构面等不利因素的存在,造成掌子面中部处原岩应力突发释放而引发高烈度的岩爆;在岩爆区段进行应力释放孔的布置,能够有效地释放原岩应力,减少岩爆发生的可能性。相关研究成果能够深化人们对于高地应力环境下岩爆发生机制的认识,为类似工程岩爆的防控及建设提供科学依据。

Study on stress characteristics and engineering effect of rockburst section of over-length and deep buried tunnel of Chenglan Railway

In order To explore deep buried tunnel under high in-situ stress environment rockburst mechanism, grasp the law, rock burst based on the field test, numerical analysis and laboratory experiments, the special deep peace of secondary stress field of tunnel surrounding rock burst are analyzed, and proved the tunnel mechanics mechanism of rockburst, and a classic stress criterion index of rock burst prediction judge the rockburst intensity and position. The results show that the large compressive stress on the side wall of the tunnel is the main cause of rock burst. Under the condition of high in-situ stress, due to the existence of disadvantageous factors such as structural plane, the stress of the original rock in the middle of the face is released suddenly, which leads to high intensity rockburst. The arrangement of stress release holes in the rock burst section can effectively release the original rock stress and reduce the possibility of rock burst. Relevant research results can deepen peoples understanding of the mechanism of rock burst under high in-situ stress environment and provide scientific basis for the prevention and control of rock burst in similar projects.