石方baopo施工方案（K17+000～K17+225路段）

一、施工方案
（一）、工程概况
该自然地形是南低北高，大部分属于半壁路堑开挖，路基宽度34米，东西长约230米，中桩最大挖深8.7米，北坡最大挖深约16米，石方baopo约60000立方米。
石质为石灰岩，中等硬度，系数5～8。
（二）、择定baopo方案
1、由于baopo区域中桩挖深0～9米不等，为此拟采用浅眼和深孔相结合的baopo施工方法。
2、对于挖深＜3米的地段，采用钎风钻钻孔，进行浅眼baopo，对于挖深≥3米的地段，采用潜孔钻钻孔，进行深孔baopo。
3、视路槽拉通后的石质完整性，必要时采用光面baopo以确保边坡平整和稳定。
4、不论是浅眼baopo还是深孔baopo，均为定向baopo，临空面方向调整为向东、向西或向西北和东北方向，避免朝向村庄方向。
5、为防止整理路槽时放小炮产生飞石，应适度进行超爆，然后回填至设计标高。
（三）、baopo参数
Blasting of the program (K17 +000 ~ K17 +225 section)

A construction program
(A), Engineering Overview
The natural terrain is high in the north to south, the majority were banbishan cutting excavation, subgrade width of 34 meters from east to west about 230 meters, the maximum deepening of 8.7 m of pile, the largest North Slope deepening of about 16 meters, about 60,000 Blasting cubic meters.
Stone is limestone, medium hardness, coefficient of 5 to 8.
(B), selected blasting program
1, due to blasting area, deepening piles ranging from 0 to 9 meters, for the proposed use of shallow hole and deep hole blasting method of combining.
2, for the deepening of <3 m sections, using drill pneumatic drill hole, for shallow hole blasting, for the deepening of ≥ 3-meter lot, with hole drilled for deep-hole blasting.
3, depending on the way trough the stone after the completeness-through, if necessary, by blasting to ensure smooth and stable slope.
4, both shallow hole blasting or blasting, are blasting, the empty direction adjusted to the east, west or northwest and northeast to avoid the direction towards the village.
5, finishing way to prevent discharge of small artillery tank produced when flying rocks, should be appropriate for ultra-blasting, then backfill to the design elevation.
(C), blasting parameters