Slurry shield high-water-pressure uneven-hardness stratum pressure maintaining construction method

The invention relates to a slurry shield high-water-pressure soft and hard uneven stratum pressure maintaining construction method. The method comprises the following steps that modified water glass is injected into the outer side of a shield tunneling machine and the outer side of a first ring pipe piece disengaged from a shield tail; cement and water glass double-liquid slurry is injected into the outer sides of the second-ring pipe piece, the third-ring pipe piece, the fifteenth-ring pipe piece and the sixteenth-ring pipe piece which are separated from the shield tail to form a hoop structure; cement paste is injected between the two hoop structures; and advanced reinforcement grouting is conducted on the upper soil layer in front of the shield tunneling machine till the shield tunneling machine conducts tunneling to pass through the soft and hard uneven stratum. According to the construction method, the pipe shed reinforcing area is formed above the to-be-tunneled soil body of the shield through advanced