1, earthwork excavation of foundation pit must be carried out in strict accordance with the construction plan, and overbreak is strictly prohibited;

2. Materials shall not be piled up around the foundation pit at will;

3. If large displacement of soil is found during excavation, the excavation shall be stopped immediately, the reasons shall be analyzed, and effective measures shall be taken;

4, the surface water around the pit should be ruled out in time;

5. When excavating earthwork, there should be enough lighting, and the electrician is on duty day and night. Earthwork excavation;

6. The allowable deviation of the excavation elevation of the main part is 375px；;

7. The allowable deviation of slope setting is 625px, but the slope should not be too steep.

Second, the artificial excavation earthwork quality assurance measures:

1, technical preparation and technical work at all levels should be done well before construction; 2. Re-sprinkle the ash line in time and measure the bottom line of foundation pit excavation at the bottom of foundation pit; 3. Seriously implement the excavation formwork system, that is, when the bottom of the slope pit is excavated again, workers with good operation skills will dig for a period of time, and then continue the excavation as a template after passing the inspection by surveyors or quality inspectors. When the construction personnel change shifts, the excavation depth, slope and operation method should be handed over to ensure the excavation quality;

4. When excavating the slope, the ditch end should be used as much as possible, and the center line of the excavator should be aligned with the lower opening line. We should adhere to the operation method of repairing slope first and then digging;

5. After earthwork excavation, concrete cushion shall be poured in time, and finished product protection shall be paid attention to. 6. Seriously implement the technical and quality management system formulated by the project department; Technical data should be accumulated during construction, such as construction diary, design change negotiation, pile inspection and line inspection records, etc.

6. After the completion of earthwork, the as-built drawing shall be drawn, and the quality grade of the project shall be checked and evaluated by the four civil representatives and quality inspectors; Three, artificial excavation earthwork safety guarantee measures:

1, do a good job of safety disclosure at all levels before construction; 2. Check whether the enclosure facilities are in good condition every day and maintain them in time;

3, digging during the rain, completes the anti-skid measures; 4. The construction site shall be fully enclosed, with faucets, drains and water collection tanks at the gate, which must be washed before entering the site, and the sludge shall not be taken out of the room, which will affect the city appearance;

5, digging at night, should configure enough lighting,;

6. In order to prevent the slope from collapsing, it is generally forbidden to pile soil above the slope. When stacking materials on one side of the slope, it shall be 1.0m away from the upper edge of the slope, and the stacking height of materials shall not exceed1.5m.: ：

7; Prepare woven bags, straw bags, stakes, etc. In advance. If the slope collapses locally, the toe of the slope can be removed.

8. If the slope is still unstable after the above measures are taken, the design unit and the temporary management unit should agree to increase the slope gradient or reinforce the soil with compaction grouting to ensure the safety of foundation pit construction.

9. In rainy weather, cover the slope with plastic film to prevent soil erosion.