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Belgorod
Response of an Aquifer to the Passage of Seismic Waves in the Close-In Zone of a Ripple-Fired Explosion in a Mine
Pavlov, D. V. (Sadovsky Institute for Dynamics of Geospheres of Russian Academy of Sciences) | Besedina, A. N. (Sadovsky Institute for Dynamics of Geospheres of Russian Academy of Sciences) | Gorbunova, E. M. (Sadovsky Institute for Dynamics of Geospheres of Russian Academy of Sciences) | Ostapchuk, A. A. (Sadovsky Institute for Dynamics of Geospheres of Russian Academy of Sciences)
Abstract Presented are the results of measuring variations of water level in an observation well during a ripple-fired explosion in a mine. Measurements were held in a well at the territory of one of the mining enterprises in the Belgorod district, Russia. The well is 141m deep. It penetrates to the Archean- Proterozoic complex of complicatedly dislocated rock, in which mining operations take place. The water level at the moment when the measurements started was 83.41m from the free surface. The measurements were held with sensors of two types - a sensor of water level and a 3-component seismometer, which was installed at the surface near the well head. An explosion at the mine was chosen for measurements, when one of the chambers was located extremely close to the observation well. The distance from the water level sensor, which was sunk into the well to the depth of 85.5m, to the ceiling of the chamber, in which about 10 tons of explosive was blasted, was only about 240m. The results of measurements showed that the maximal amplitude of dynamic oscillations of water level was 12mm. The main frequency of oscillations was in the range of 15-20Hz, which coincided with the frequency of the signal recorded by the seismometer. No residual changes of the water level accompanying the passage of seismic waves produced by the explosion were observed. 1 Introduction Observations over variations of underground water level in wells had started long ago. They are used for various purposes. Bredehoeft (1967) dates first publications concerning the effect of Earth tides on variations of underground water level to 1880. In the abovementioned paper as well as in the papers by Hsieh et al. (1987; 1988) the characteristics of water level variations in an open well under cyclic loads, such as Earth tides and atmospheric pressure, had been obtained analytically. Cooper et al. (1965) and Liu et al. (1989) had obtained an analytical solution for oscillations of water level in an open well under the action of seismic waves.
- North America > United States (1.00)
- Europe > Russia > Central Federal District > Belgorod Oblast > Belgorod (0.25)
- Geology > Structural Geology > Tectonics > Plate Tectonics > Earthquake (0.53)
- Geology > Geological Subdiscipline (0.47)
Manifestations of Nonlinearity of Deformation Properties of a Regional Fault
Pavlov, D. V. (Institute of Geosphere Dynamics of Russian Academy of Sciences) | Kulikov, V. I. (Institute of Geosphere Dynamics of Russian Academy of Sciences) | Markov, V. K. (Institute of Geosphere Dynamics of Russian Academy of Sciences) | Ostapchuk, A. A. (Institute of Geosphere Dynamics of Russian Academy of Sciences) | Sedochenko, V. V. (Institute of Geosphere Dynamics of Russian Academy of Sciences)
ABSTRACT Presented are the results of seismic and deformation monitoring of a regional fault performed at the depth of 300 m from the free surface in one of the tunnels of an active mine recovering iron ore. Two different sources were used for seismic illumination of the fault: impacts of a sleeper over the tunnel wall and a delay-fired explosion in the mine. It is demonstrated that in the range of small strains 10–10 the normal stiffness of the dis-continuity exhibits non-linearity—as the amplitude of disturbance increases by an order of magnitude, the normal stiffness of the fault decreases by more than an order of magnitude. 1 Introduction Currently authors test the system of seismic and deformation monitoring of tectonic faults at the I.M.Gubkin Mine of the KMAruda Enterprise, which yields iron ore in the town of Gubkin, Belgorod district, Russia (Adushkin et al., 2017). The seismic monitoring employs an original method of determining deformation characteristics of a fault developed in IDG RAS in 80s–90s years of the last century, which bases on the analysis of alteration of dynamic parameters of seismic waves when they interact with rock discontinuities (Kabychenko et al., 1996; Kostyuchenko et al., 2002; Kocharyan, 2016). The main parameters taken to "watch over" fault conditions are its stiffnesses, the normal and the shear ones, respectively: (equation) where σ and τ are the normal and shear stresses acting in the vicinity of the fault, Wn and Ws are relative normal and shear displacements of its sides. The transition of a fault to the metastable state is accompanied by a decrease of its shear stiffness (Adushkin et al., 2016). It is this statement that underlie the system of monitoring being developed. The main goal of the work is trying to trace, at an active mine, how does the stiffness of the fault change. 2 RESULTS OF MEASUREMENTS In order to test the system of monitoring, the so called Stretensky Fault was chosen, which, according to geological classification, is a regional one. The fault is steeply-dipping, its thickness reaches 100 m and it is about 10 km long. A more detailed description of the fault one can find in the work by V.V. Adushkin with coauthors (Adushkin et al., 2017).