Using preact grouting to strengthen and improve strata, the safe excavation in the loose stratum with silty sand was achieved.
采用超前注浆加固改良
，实现了在粉
安全开挖；
Using preact grouting to strengthen and improve strata, the safe excavation in the loose stratum with silty sand was achieved.
采用超前注浆加固改良，实现了在粉安全开挖；
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