New and old embankment earth dam crack treatment method based on grouting

The invention discloses a grouting-based new and old embankment earth dam crack treatment method, which comprises the following steps of: 1, determining an observation point, and embedding an observation pile; 2, a plurality of test holes are formed in the two sides of the crack at intervals, a grouting test is conducted, and construction parameters are determined; 3, holes are formed in the new embankment earth dam and the old embankment earth dam, and a row of grouting holes distributed in the length direction of the crack are formed in each of the two sides of the crack; 4, according to the construction parameters, grouting is conducted in the crack, grouting is conducted in the two rows of grouting holes, the crack is filled with slurry, and soil bodies on the two sides of the crack are extruded and compacted; and step 5, sealing and consolidating each grouting hole. The invention relates to the technical field of hydraulic engineering construction, and can solve the problems of large excavation backfilli