What are the correct construction steps of dynamic compaction?

1、认真调查，确保强夯场地范围内的地下无构筑物。清理干净地表土，除去范围为路基坡脚外2～3m。整平后在场地上标出一遍夯点的位置，点位偏差控制在±20cm范围内，并测量场地高程。

1. Carefully investigate to ensure that there are no underground structures within the scope of dynamic compaction site. The surface soil shall be cleaned, and the removal range is 2 ~ 3M outside the subgrade slope toe. After leveling, mark the position of one tamping point on the site, control the point position deviation within ± 20cm, and measure the site elevation.

2、起重机就位，使夯锤对准夯点位置，测量夯前锤顶高程。

2. Put the crane in place, align the tamping hammer with the tamping point, and measure the top elevation of the hammer before tamping.

3、将夯锤起吊到预定高度，待夯锤脱钩自由下落后，放下吊钩，测量锤顶高程。若发现因坑底倾斜而造成夯锤歪斜时，及时将坑底整平。

3. Lift the rammer to the predetermined height. After the rammer is unhooked and falls freely, put down the hook and measure the top elevation of the hammer. If the rammer is found to be skewed due to the inclination of the pit bottom, the pit bottom shall be leveled in time.

4、重复第三项操作，完成一个夯点的夯击，即每个夯点夯6击。除满足Z后2击平均夯沉量不大于50mm外，还要求总夯沉量不小于试夯总夯沉量的90%。

4. Repeat the third operation to complete the tamping of one tamping point, i.e. 6 tamping for each tamping point. In addition to meeting the requirement that the average tamping settlement of two blows after Z shall not be greater than 50mm, the total tamping settlement shall not be less than 90% of the total tamping settlement of test tamping.

5、换夯点，重复二项和第四项操作，直到完成1遍全部夯点的夯击。用推土机将夯坑填平，并测量场地高程。

5. Change the tamping points and repeat the second and fourth operations until all tamping points are tamped once. Fill the tamping pit with bulldozer and measure the site elevation.

6、在规定的间隔时间后，按上述步骤逐次完成第2，3，4遍夯击。

6. After the specified interval, complete the second, third and fourth compaction step by step according to the above steps.

7、选用锤质量为3t、落距为6m进行低能满夯2遍，将场地表层松土夯实，要求后一遍与前一遍错开半夯；Z后测量夯后场地高程。

7. Select a hammer with a mass of 3T and a falling distance of 6m for 2 times of low-energy full compaction, loosen the soil on the surface of the site and compact it. It is required to stagger the latter one with the previous one for half compaction; Z measure the site elevation after tamping.

8、灰土封闭。在基底地面铺设一层0.20m厚2：8灰土。施工时，石灰撒入土中，不洒水进行初拌，拌匀后应闷料8～12h，再进行洒水复拌，拌匀后即整平、压实；待强度检测合格后在灰土垫层上铺设一层防渗复合土工膜。

8. Lime soil sealing. Lay a layer of 0.20m thick 2:8 lime soil on the base ground. During construction, lime shall be sprinkled into the soil without watering for initial mixing. After mixing, the material shall be stuffy for 8 ~ 12h, and then watered for re mixing. After mixing, it shall be leveled and compacted; After the strength test is qualified, a layer of anti-seepage composite geomembrane shall be laid on the lime soil cushion.

9、边坡加固。路基面下0.60m处铺设双向精编土工格栅，土工格栅每层垂直间距为0.50m，Z上两层沿平面铺通，其余各层深入路堤边坡宽度2.50m，格栅距边坡线的距离不小于0.10m，土工格栅对应伸长率为10%时，纵横向抗拉强度不小于25kN/m。

9. Slope reinforcement. Two way fine woven geogrid is laid 0.60m below the subgrade surface. The vertical spacing of each layer of geogrid is 0.50m. The upper two layers of Z are paved along the plane. The width of the other layers is 2.50M deep into the embankment slope. The distance between the grid and the slope line is not less than 0.10m. When the corresponding elongation of geogrid is 10%, the longitudinal and transverse tensile strength is not less than 25kn / m.

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