At the same time, the blasting measures are optimized in combination with the actual situation to reduce the disturbance to the surrounding rock and effectively avoid the construction safety risks caused by the changeable surrounding rock.
Focus on “Enjoy Dechang” To learn about the dynamic business cooperation/information in your hometown, please contact WeChat 1850834022719160246267 — The above is an advertisement patch — Recently, the Hengdong inclined shaft section of the left line of Daliang Mountain Tunnel 2, a regulatory project of Leshan Xichang Expressway, was contracted by the First Company of China Railway 17th Bureau.
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Figure | Route Map of Bid Section Daliang Mountain Tunnel 2 contracted by the First Company of China Railway 17th Bureau is the fourth longest expressway tunnel under construction in southwest China, with a total length of about 12.6 km.
The completion of the project is of great significance for strengthening the connection between Chengdu Plain Economic Zone and Panzhihua Xichang Economic Zone, promoting the rural revitalization in Liangshan and Daliang Mountains, and promoting the comprehensive and coordinated development of Sichuan Chongqing Economic Zone.
Figure of “Changing Face” Problem of Surrounding Rock by Combining Long with Short | During tunnel excavation in tunnel face construction, it is difficult to predict the drilling process due to the change of surrounding rock that exceeds expectations.
It is a highly concerned controlled project along the whole line.
In order to solve this problem, the project is planned in advance before going on stage, and on the basis of strict implementation of local environmental and water conservation measures, the land reuse mode is explored.
By setting up the waste disposal area beside the construction road, building a gravel processing area nearby, leveling the waste disposal area to store sand and gravel, etc., the land is recycled, the construction materials are sufficient and controllable, and the construction and production work is steadily promoted.
The surrounding rock in the tunnel changes rapidly, with many interlayers, broken rock mass, poor ventilation conditions, and difficult material transportation.
It is extremely difficult to transport materials to the construction site.
Plan ahead for recycling “turning waste into treasure” map | The project is located in the hinterland of Daliang Mountain, with high mountains and steep slopes and narrow and dangerous roads.
Smooth blasting takes into account the “lifeline” and “economic account” figure | Safety inspection items before blasting.
In view of the construction characteristics of the tunnel, a special construction plan is prepared.
Source: China Railway 17th Bureau ● Liangshan will add a private airport……
The number of auxiliary hole rows is increased from 2 rows to 3 rows, and the total number of blastholes is adjusted from 140 to 165, which not only makes the tunnel contour line after blasting meet the design requirements, but also effectively controls the problem of over excavation and under excavation, On the basis of keeping the safety and quality lifeline, the goal of cost reduction and efficiency increase has been achieved.
The project has innovatively proposed the construction method of “long distance detection+short distance verification” after many practices, and used the combination of advanced prediction and geological radar method to predict the surrounding rock in advance.
It is an important step towards the goal of opening the first expressway deep into Daliang and Xiaoliang Mountains in Sichuan Province in advance | The builders celebrate that the tunnel runs through Leshan Xichang Expressway with a total length of 151.8 kilometers, Deep into the steep Liangshan and Xiaoliangshan areas, the ancient roads are winding and the scenery is wonderful.
Smooth blasting technology is adopted, and the delayed stripping blasting idea of “more drilling, less charging” is adhered to.
