1. Introduction
Abandoned roadways were revealed during the excavation of a working face in a coal mine in Shanxi. According to the survey and ground geophysical data, the abandoned roadways and goaf may have a large potential safety hazard threatening mining safety during the mining process.
2. Treatment solution
In-seam seismic exploration technology can effectively detect small geological structures, faults, abnormal bodies and thickness changes in a coal seam. The tomographic technology can reproduce the underground geological structure and effectively guide the underground mining work.
3. Work situation
Shot points and geophones (pointing to the detection area) were arranged along the head entry, tail entry and interconnection of the working face. The distance between the receiving points was 10m and the distance between the excitation points was 20m. The blasting boreholes were 3m deep and perpendicular to the coal wall. A total of 3050 m of survey lines, 306 detection points and 151 excitation points were set up for data acquisition. High-quality transmission channel seismic wave data were collected. The perspective ray density was high and covered the entire exploration area.
Figure 1 Engineering layout
1. Achieved accomplishment
According to the actuality of the roadway exposure and the interpretation of wave tomography, comprehensive analysis was conducted. In-seam wave imaging results of the abandoned goaf had quite accurate consistency with the actual exposure.
Figure 2．Exploration results
CACT imaging results of in-seam wave exploration: The dark red area in Fig.2 corresponded to the abandoned roadways, and the orange or yellow area was basically consistent with the abandoned roadways predicted by drilling operation. The delineated range of other abandoned roadways is shown in the middle shaded area. Its east boundary is about 550m from the contact lane, and the west boundary is about 350m from the incision.
FAQ
Question 1: What are the advantages of the in-seam seismic exploration?
A: Inseam seismic exploration has the advantages of large detection distance, high accuracy, strong anti-interference ability, easy identification of waveform characteristics, and intuitive final results.
Question 2: What can your company do in this field?
Answer: We can efficiently explore major geological structures and hidden geological hazards encountered in the process of mine exploration, construction, production, and shutdown.
Question 3: What advantages does your company have comparing with other companies?
Answer: We are committed to the design and construction of mine disaster prevention and relief projects, forming a complete set of mine geological structure detection technology and equipment.
Question 4: What is the cost of an in-seam seismic survey?
A: The cost of inseam seismic exploration is related to many issues, such as geological conditions, engineering quantities, degree of detection difficulty, etc. Usually we will provide a feasibility study plan with a general quotation after getting more understanding about the geological conditions.
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