ABSTRACT: In view of the construction and quality control of the mine landslide geological hazard control project, based on the brief description of the engineering characteristics of the mine landslide geological hazard control project, the construction key points and quality control measures are analyzed in depth. Reasonable construction design and standardized quality control measures are obtained. It is hoped that these measures will be helpful to the improvement of geological hazard control effect of mine landslides.
Key words: mine; landslide geological hazard; harnessing engineering construction; quality control
The construction quality of mine landslide geological hazard control project is of great significance to mine safety. In recent years, with the expansion of human activities, serious damage has been caused to the natural ecological environment. The frequent occurrence of geological landslide hazards poses a serious threat to people's life safety and property safety, and puts forward more suggestions for the construction quality of mine landslide geological hazard control project. High requirements. Based on engineering examples, the construction and quality control of mine landslide geological hazard control project are analyzed as follows.
Overview of Project 1
The plane of landslide in a mining area is fan-shaped, the longest is 456 m, the shortest is 267 m, the rear edge is 300 m wide, the middle is 300 m ~ 400 m wide, the front is 520 m wide, and the total volume is between 2.5 million cubic meters and 3 million cubic meters. It belongs to a large area of landslide, and the amount of landslide geological hazard control project is relatively large. It needs very high technology and quality control measures to ensure the control effect.
2. Characteristics of Landslide Geological Disaster Control Engineering
As far as case engineering is concerned, landslide geological hazards are highly concealed and gradual. If not treated in time, they will cause serious harm to the surrounding ecological environment. According to the on-site investigation results of the survey units, the landslide geological hazard control project has the following characteristics: first, the construction environment is relatively complex, the construction area is relatively large, and the construction conditions are relatively poor, which greatly increases the difficulty of landslide geological hazard control; second, the construction period is relatively tight, and the occurrence of geological hazards is highly uncertain, which will lead to the normal occurrence of mining areas. The safety of production and personnel equipment poses a serious threat.
3. Construction of Landslide Geological Hazard Engineering
3.1 Drainage Engineering Construction Technology
Foundation excavation technology. The foundation and slope excavation of drainage engineering should fully conform to the design size. In foundation excavation, the principle of "top-down" should be followed, that is, excavating the slope first and then excavating the floor. When the foundation excavation is completed, professional owners and engineering supervisors should be invited to conduct a comprehensive audit. Only after the audit is passed, can the construction of the next process be carried out. (2) Basic treatment. When the foundation of drainage works is excavated, all-round treatment should be carried out, including rolling and slope rectification. In order to ensure the treatment effect, sampling test should be carried out to ensure that the treated foundation of drainage works can meet the actual needs. In the foundation area of the depression area, the materials such as stone debris and gravel should be backfilled and compacted by sprinkling water. After passing the inspection, the construction should be carried out in accordance with the relevant norms and standards.
3.2 Anti-slide Pile Construction
The construction quality of landslide geological hazard engineering can be greatly improved by anti-slide piles, no matter which construction method. The main principle is to insert piles under the sliding zone of landslide under the action of external forces, and then balance the thrust of landslide by anchoring action. By this method, the friction force of landslide can be effectively increased and the sliding speed can be reduced.
3.3 Construction Technology of Backfill Slope Protection
Firstly, the debris on the surface of backfill should be cleaned up in time, and then positioning and setting-out should be carried out by professional surveyors. Through backfilling and rolling of gravel soil, the stability of slope protection can be improved and the continuous occurrence of landslides can be alleviated. Secondly, when backfilling, two or more fillers with different permeability should be used for layered filling to ensure the construction quality of mine landslide geological hazard control project. The upper layer should be filled with fillers with smaller permeability and the lower layer with larger permeability. After completion of filling, appropriate drainage slope protection should also be set up, and the filler with larger permeability should be used as far as possible in slope construction. Thirdly, the settlement of filling should be reserved according to the corresponding design standards. If there is no design requirement, the settlement should be set according to the nature of landslide geological hazard control project, filling height, filling type, etc. Normally, the settlement can not exceed 3% of the filling height.
Quality Control Measures for Construction of 4 Mountain Landslide Geological Disaster Control Project
4.1 Quality Control Measures before Construction
Before the construction of landslide geological hazard control project, scientific and reasonable construction personnel and mechanical equipment should be selected according to the quantity and actual situation of the project. At the same time, in order to avoid safety accidents, all personnel entering the construction site should be trained comprehensively and systematically. Only those who pass the training and assessment can take up their posts. Integrate safety awareness, quality awareness and cooperation awareness into the training content to ensure that each construction worker can clearly identify their responsibilities, recognize the source of site hazards, and ensure that all work can be carried out smoothly. According to the results of geological exploration and the actual situation of landslide geological hazard prevention and control project, a scientific and reasonable construction scheme is formulated. Through a series of analysis and comparison, the shortcomings in the construction scheme are found out, so as to avoid unnecessary engineering changes in the construction process, and to provide real and effective data support for the later construction.
4.2 Quality Control in Construction
Construction process is the most time-consuming and cost-effective link in the whole landslide geological hazard control project. Any detail quality problem will have a serious impact on the stability of the entire project structure. Therefore, it is necessary to rationally allocate construction materials, determine the best concrete mix proportion through many tests, mix concrete and mortar evenly in the concrete configuration, and mix materials strictly according to the test results (mix ratio) in the concrete configuration, so as to maximize the lifting and workability of concrete. In case engineering, in order to avoid segregation effectively, the method of series barrel combined with chute is adopted in the concrete pouring of anti-slide pile body. The distance between the bottom of chute and anti-slide pile should be controlled within 2 m in order to improve the quality of concrete. Because the amount of concrete used in anti-slide piles is relatively large, layered pouring and layered tamping should be adopted. The thickness of each layer of concrete should be controlled between 0.3 m and 0.5 m, and all-round vibration tamping should be carried out by inserting vibration tamping rods.
4.3 Post-event Quality Control Measures
In the process of construction supervision, the construction party should strictly follow the established norms and standards for acceptance. In the process of sub-project evaluation, managers should take an objective and impartial attitude and record all contents in an all-round way. When dealing with engineering quality, we should reasonably urge the constructors to carry out self-inspection and mutual inspection according to the construction plan and standards formulated, so as to find out the problems in construction in time. If the deformation and cracks occur in the construction of anti-slide piles, we should send professional personnel to deal with them, so as to ensure that the landslide geological hazard control project will not be accepted in construction. To the interference of external factors.
5 Concluding remarks
In summary, combined with engineering examples, this paper thoroughly analyzed the construction and quality control of mine landslide geological hazard control project. The results show that mine landslide geological hazard is the most common disease in mine production, and has a great threat to people's life safety and property safety. In recent years, the relevant departments have paid more and more attention to the effect of landslide geological hazard control in mines. Landslide geological hazard control engineering is closely related to engineering and natural ecology, so higher requirements are put forward for construction professionalism.
Reference:
[1] Zhang Lili. On How to Strengthen the Quality Control of Geological Disaster Control Construction [J]. Scientific Research, 2017 (1): 00156-00156.