It totally took 19 months to complete the construction of the output of No. 1 Qinling tunnel from Feb. 16, 1998 to Aug. 26, 1999, with the total driving length of 5720. 118m, average monthly advance of 301. 06m, daily advance of 10. 307 m, max. monthly advance and daily advance of 508. 96m and 35. 254m respectively.
The meam monthly advance was 105m and the max. 128m. The tunnel was profiled welland has a regular outline with a half hole rate of more than 90% and over-or under-break of less than 12cm.
Five indices of the medium conditions, occurence background, and engineering factors of rocks, such as uniaxial compressive strength, rock quality distribution, coal mass strength, groundwater status, and monthly advance of working face are used in establishing, the dynamical evaluation model of the roof stability with artificial neural network(ANN).
First is a monthly advance notice message now sent via postcard or automated out-bound FAX.
例句来源
the technique of shaft raising started from using conventional drill and blast method to using raise borer. A small diameter, 0217 mm, pilot hole is drilled by a raise borer downward. It is reamed upward to 1 m diameter. Then drill and blast method is used to enlarge the hole to the specified cross-section. When the finished diameter is not more than 2m, sometimes, it is enlarged by borer in one pass to the required diameter. Raise-boring embodies fast excavation. The monthly advance of finished...
The project management by objectives was successfully implemented for tunnel grouting in the Tianshengqiao Ⅱ hydropower project, which was techically difficult and complicated, and the time forconstruction was very pressing. By this way of management the highest monthly advance and efficiency and productivity were made,the best record ever achieved in China.
On the way of the special access road to the Three Gorges Project the Zhayanshan two-linetunnel has a total length of 1 776m with a section of H9m ×12.5m, and a round crown and curve walls.The whole tunnel breaks through lime shale Cambrian Miocene series with a weak lithologic character, developed fracture and ample ground water. During the advancing the section was diveded into a heading andthree benchings and advance support including consolidation, pipe frames, steel wires, shotcrete and rockbolts...