Some results of stability evaluation for the Song Tranh 2 dams and its surrounding geological environment by microseismic investigations
In this paper the authors present the results of evaluation of stability for the Song Tranh 2 dam and its surrounding geological environment. The study is carried out by using two modifications of microseismic observation. For the first modification the data were collected along 5 profiles distributed on land surface of the dam area and its surrounding. In the second modification the measurements were concentrated in the dam location with the microseismic signals generated by rotation of turbines of the electric power plant as an additional source. In this case the investigated profiles are distributed both on the top surface of the dam as well as along the tunnels constructed inside the dam body.
The high value of the relative intensity of microseismic signals (The ratio of the microseismic wave amplitudes in a certain frequency band recorded by the movement and fixed stations obtained in this study are allowed us to reveal a number of heterogeneity objects distributed in the dam and its surrounding geological environment with define depth. The technique is more effectivle in the detection of subvertical contact. The correlation with the geological - geophysical available data is indicated the heterogeneities mostly are taken places where distributed tectonic fault or underground weak section.
It will be very useful if the technique is applied for the study of the same problem for the other hydroelectric power plants in Vietnam.
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