Coal mine survey is an indispensable key link in coal mine production and construction, which directly affects the construction and planning of mines and the development of other basic work. Therefore, preventive measures should be taken to avoid similar survey accidents.
A, coal mine survey accident cause analysis 1. Accidents caused by line extension errors.
In the process of gob-side entry driving in coal mine, because the lower part has just finished mining a working face, the middle line of the roadway moves due to high dynamic pressure. The technical personnel on duty did not find and check the delay point in time, and the distance checked by the conductor did not meet the requirements. When the roadway is excavated to 1.20m, when conducting traverse survey, technicians find that the centerline of the roadway is different from the designed orientation by1.20', and the center of the section is also shifted to the left by1.6m.. The staff immediately reported to the relevant leaders. The department head made a decision to rework 50 meters in response to this accident, and traced the person responsible for this matter.
2. Open the accident caused by calibration error.
In the process of opening a mechanical roadway in a coal mine, the staff only made a simple calibration and did not repeat the measurement. When the roadway is driven to the cutting position, it is found that the difference from the design center point is 1, which leads to the cutting opening being16m shorter, and it is difficult to move the fully mechanized support after it is placed, so that the machine and the roadway cannot remain parallel. At the same time, in the process of retreating, it is necessary to place a fully mechanized support at intervals, which seriously affects the normal production of coal mines.
Through the analysis of the accident, it is found that the method of giving points for the first time by surveyors is too simple, and the distance between measuring points is too large, which leads to too large deviation and even a certain gross error. There is no repeated measurement after tunneling to the corresponding distance, which violates the measurement operation rules and belongs to the measurement responsibility accident.
3. Accidents caused by waist line errors
The waist line in the east return air lane of a mine runs through. The length of the through conductor is 5000 meters, and two measuring teams are responsible for both ends. There is a waistline at the floor 1 m in the design. One of the teams failed to feed the waist line at a distance of one meter above the support as required, resulting in a difference of 0.5 meters between the waist lines at both ends and a triangle height system error of 0.4 meters, which together with the waist line error caused a 0.9-meter breakthrough accident. This belongs to the responsibility accident caused by the wrong measurement method of roadway.
4. Accidents caused by length measurement errors
In the construction of inclined shaft project in a mine, the up-and-down through excavation was carried out. After the completion of excavation, it is found that the accuracy of the main direction and waist line of mine roadway meets the design requirements, but the longitudinal error of continuous measurement is 0.8 meters. Although this error did not bring losses to the project, it still belongs to a survey accident. The main direction and elevation can be basically closed after the roadway is connected, which means that there is no problem in checking the measuring angle and ground control data. After analysis, it may be caused by the gross error of measuring a certain side length.
Second, the coal mine survey accident prevention measures 1. Formulate a strict measurement and inspection system.
In coal mine geological survey, all technicians should strictly follow the relevant national technical specifications. Do not meet the requirements of the specification should be redone or supplemented immediately. In the event of a geological survey accident, the staff should analyze, sum up experience and learn lessons. In the process of design, construction and collection, geological survey personnel shall be responsible for the quality of survey data provided by relevant departments. If they find any difference from the displayed results, they should re-check and give an explanation. Every working face in tunneling needs to be summarized and sorted out. If problems that cannot be solved are found, they should be reported to the company headquarters immediately, analyzed with * * * and solutions are obtained to ensure the smooth development of coal mine production. If the geological conditions of the construction roadway are unfavorable, it is likely to form a waste roadway. Therefore, if such problems are found in the measurement, they should be reported to the headquarters and engineers immediately so as to correct them in time.
2. Determine the correct measurement method
In the process of measurement, technicians should strictly check and calculate the original data, original data and drawings in the measurement, and materials and drawings that have not been audited by technicians shall not be used without authorization. Both the record book and the result ledger in the measurement need to be verified, and the parts that need to be redone should be explained, and the necessary sketches should be drawn in the remarks. Before construction survey, you should be familiar with the construction design drawings, check the coordinate, elevation and geometric relationship in the drawings, strengthen communication with relevant departments, and check the points and technical achievements that need to be measured. After the completion of the construction project, the calibration value should be compared with the design data to determine whether the calculation error is within the allowable range. If the measurement error is too large, we should find out the reason, sum up the experience and lessons, and provide reference for future work.
Coal mine survey is an indispensable key link in coal mine production and construction, which directly affects mine construction and planning. Surveyors should do a good job in every link of the work, strengthen the management of coal mine survey work and formulate strict survey inspection system, so as to effectively reduce the probability of coal mine survey accidents and ensure the smooth development of coal mine production and construction.