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Geo-mechanical model test on the water inrush induced by zonal disintegration of deep tunnel under hydro-mechanical coupling
International Journal of Rock Mechanics and Mining Sciences ( IF 7.2 ) Pub Date : 2022-11-16 , DOI: 10.1016/j.ijrmms.2022.105278
Tianen Xue, Qiangyong Zhang, Kang Duan, Pengfei Wang, Hanxiang Lin, Qinghan Fan, Lei Liu

With the increase of burial depth, complex geological environments such as high in-situ stress and high seepage pressure will inevitably affect the generation of zonal disintegration and may induce water inrush disasters during the excavation of the deep tunnel. A true three-dimensional geo-mechanical model test is conducted to study the mechanism of water inrush induced by zonal disintegration under hydro-mechanical coupling. The distribution and variation of different physical information during excavation, including displacement, stress and seepage pressure, are comprehensively analyzed. Test results reveal that zonal disintegration may induce water inrush when the tunnel is excavated under the coupling action of high stress and high seepage pressure. The excavation disturbance causes the stress in the rock mass to be oscillating. As a result, rupture and non-rupture zones appear alternately around the tunnel. With the increase of seepage pressure, the rock mass in non-rupture zone, which acts as the water barrier, is damaged and connects with rupture zone to form a water inrush channel. Eventually, high-pressure water pours into the tunnel to form a water inrush disaster. The reproduction of this special phenomenon will provide an important test basis for further theoretical and numerical studies.



中文翻译:

水力耦合下深埋隧道分区崩塌突水地质力学模型试验

随着埋深的增加,高地应力、高渗压等复杂地质环境必然会影响到层状解体的产生,并可能在深埋隧道开挖过程中诱发突水灾害。进行了真三维地质力学模型试验,研究了水力耦合下纬向解体突水的机理。综合分析开挖过程中位移、应力、渗压等不同物理信息的分布和变化。试验结果表明,在高应力和高渗压的耦合作用下,隧道开挖可能会出现层间崩解导致突水。开挖扰动导致岩体中的应力振荡。因此,隧道周围交替出现破裂带和非破裂带。随着渗流压力的增加,作为水屏障的非破裂带岩体遭到破坏,并与破裂带相连形成突水通道。最终,高压水涌入隧道形成突水灾害。这一特殊现象的再现将为进一步的理论和数值研究提供重要的试验依据。

更新日期:2022-11-16
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