操作坑回填。操作坑回填时对于石方段操作坑应首先采用细土回填，回填高度距

Operation pit backfill. When backfilling the operation pit, the operation pit of the stone section should first be backfilled with fine soil, and the backfill height should be no less than 300mm above the top of the pipe, and then backfilled with undisturbed soil to the surface height of more than 300mm. Landform restoration. The landform will be restored in time after the operation pit is backfilled. Positioning mark. Mark the repaired parts that have been accurately positioned. The way of marking is determined by the owner according to his own habits.

Operation pit backfilling. Operation pit backfilling for the stone section of the operation pit should first use fine soil backfilling, backfilling height from the top of the tube is not less than 300mm, and then the use of original soil backfilling, backfilling to the surface height of more than 300mm. Geomorphological restoration. The landscape is restored in time after the operation pit is backfilled. The anchor. The exact location of the repair has been precisely located to mark the way the mark is determined by the owner according to their own habits.

Operation pit backfilling. During backfilling of operation pit, for operation pit in stonework section, fine soil shall be used for backfilling first, and the backfilling height shall not be less than 300 mm above the pipe top, then undisturbed soil shall be used for backfilling, and the backfilling shall be more than 300 mm above the surface height. Landscape restoration. The landform of the operation pit shall be restored in time after backfilling. Locate the tag. Mark the parts that have been precisely positioned and repaired, and the way of marking shall be determined by the owner according to his own habits.