Geomechanical Monitoring of Temporal Lining in Rail Tunneling in Complex Geological Conditions
V. N. OPARIN1,2, V. F. YUSHKIN1, G. N. POLYANKIN3, A. N. GRISHIN3, A. O. KUZNETSOV3, D. E. RUBLEV1
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia
3Siberian State University of Railway Transport, ul. Dusi Koval’chuk 191, Novosibirsk, 630049 Russia
Keywords: блочный массив, временная крепь, обделка тоннеля, деформационный мониторинг, лазерное сканирование, сейсмическая волна, коэффициент крепости пород, спектральный анализ, block rock mass, temporal lining, tunnel lining, deformation monitoring, laser scanning, seismic wave, rock hardness coefficient, spectrum analysis
Abstract
The article describes the integrated method and results of deformation-wave monitoring of temporal lining in rail tunneling in complex geological conditions on the south of Western Siberia. 3D geometric parameters of temporal lining are measured by laser scanning at a span of 3 months, which enables comparing actual 3D models of temporal lining and rocks in reinforced tunnel section. Based on the data obtained at various times of observation, shifting of unmarked points of temporal lining and deformation of tunnel walls and arch was determined. High density scanning allows remote identification of comparatively small zones where structure of rocks and state of lining are changed. The authors analyze seismic vibration of rocks under hammering, which shows that peak spectral densities of elastic wave in rocks are conditioned by low-frequency (pendulum) wave generated at siltstone and coal interface, and are related with dimension of joints and with mechanical properties of rocks.
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