复合沟盖板的基础土方采用反铲挖掘机开挖，根据地质勘测及现场实际情况采用1:0.33放坡，基坑内挖出的土全部用两台5T汽车运送到场外东南角指定土方堆放区。
The foundation of composite ditch cover plate is excavated by backhoe excavator. According to geological survey and actual situation on site, 1:0.33 slope is adopted. All excavated soil in the foundation pit is transported to the designated earth storage area at the southeast corner of the site by two 5T trucks.
机械挖方挖至设计标高以上200mm后，采用人工清底，以免复合沟盖板机械挖方时对天然地基的扰动。严禁超挖，超挖后应按规范进行回填，并通知试验部门进行检验；土方开挖结束后，开始对边坡进行修整，不能有浮土和高底不平现象。
After the mechanical excavation reaches 200 mm above the design elevation, manual bottom cleaning is adopted to avoid disturbance of natural foundation caused by mechanical excavation of composite ditch cover plate. Over-excavation is strictly prohibited. After over-excavation, backfilling should be carried out according to the specifications, and the testing department should be notified to carry out inspection. After the earth excavation, the slope should be repaired without floating soil and uneven bottom.