1.勘探孔平面布置原则
本次补勘仅限于盾构隧道范围内进行, 根据委托方的布孔要求, 原则上地层变化不大的地段按20米间距双侧交叉错开布置, 对于盾构始发端、到达端及岩面起伏较大、上软下硬地段或线路经过重要、敏感建筑及构筑物位置地段则根据现场情况适当加密钻孔。结合既有钻孔, 本区间共布置246个钻孔, 钻孔编号为DGB-1~DGB-246同声传译。
1. Plane Layout Principle of Exploratory Hole
The supplementary investigation is only limited to shield tunneling tunnel range; in accordance with the hole arrangement requirements of entrusting party, the lot with little layer change should be carried out the staggered arrangement according to 20-meter interval in principle. Carry out the infill drilling appropriately on the originating terminal and arrival terminal of shield tunneling, large rock face fluctuation, upper soft and lower hard lot or the line passes through important and sensitive building and structure position lot according to the site conditions. Combining the exisiting drilling holes, the interval is arranged 246 drilling holes in total; drilling hole number is DGB-1~DGB-246.
2、勘探孔编号
钻孔编号为DGB－××, DGB代表盾构隧道补充勘察, ××表示钻孔编号, 隧道左右两侧分别以单、双数字表示, 详勘察钻孔编号意义见“详勘报告”。
2. Exploratory hole number
Hole-drilling number is DGB-××, DGB stands for supplementary investigation of shield tunneling, XX stands for hole-drilling number, left and right sides of tunnel is expressed by odd and even numbers. See Detailed Investigation Report for hole-drilling number meaning of detailed investigation.
3、勘探孔孔深确定原则
钻孔深度要求: 原则上要求钻孔深度穿越隧道洞身不少于1米, 即隧道最低轮廓线以下不少于1米。若有特殊原因不需要穿越隧道洞身的, 须征得项目部现场技术人员同意确认。如隧道底板以下为松散地层、全风化带, 则钻入6米。技术孔必须穿越软土、粉细砂等地层, 底板以下为松散地层、全、强风化带, 则钻入10米上海英语翻译。
3. Determination principle of exploratory hole depth
Requirements for drilling depth: It is required that the drilling depth of crossing tunnel trunk is not less than 1 meter, that is, the lowest contour line of tunnel is not less than 1 meter. If crossing tunnel trunk doesn’t required due to special cause, it should be approved and confirmed by on-site technicians of Project Department. If there is unconsolidated formation and weathered zone below the tunnel floor, drill in 6 meters. Technical hole must be passed through soft soil, fine silty sand and other formations; if there is unconsolidated formation and full strong weathered zone below the bottom plate, drill in 10 meters.
