Construction method for reinforcing loess embankment by combining microbial mineralization with phosphogypsum

A construction method for reinforcing a loess embankment by combining microbial mineralization with phosphogypsum, comprising the following steps:

• (1) placing Bacillus pasteurii in a culture medium to prepare a microbial solution, and mixing urea, calcium chloride and water to prepare a cementing solution;
• (2) the microbial solution and water, and adding the cementing solution to prepare an improving mixture;
• (3) leveling and compacting an original ground;
• laying a first geomembrane, laying a first layer of improving mixture on the first geomembrane, and compacting until a desired compactness;
• then laying a second geomembrane on the top of the first layer of improving mixture, laying a second layer of improving mixture on the second geomembrane, and compacting until a desired compactness;
• (4) laying a first geogrid on the top of the second layer of improving mixture, laying a third layer of improving mixture on the first geogrid, and compacting until a desired compactness, wherein one geogrid is laid every three layers of improving mixture;
• and
• (5) laying a last geomembrane on the top of the embankment after the embankment is laid, and then laying a roadbed.