Soft and weak water-rich stratum subway foundation pit reinforced digging method based on half-covered digging method

The invention discloses a soft and weak water-rich stratum subway foundation pit reinforced digging method based on a half-covered digging method. The reinforced digging method includes the followingsteps of firstly, performing the reinforcing construction of a right half foundation pit soil body, and alternately performing the reinforcing of underground continuous wall groove walls and the reinforcing of the foundation pit passive zone; secondly, constructing a right side underground continuous wall; thirdly, constructing temporary stand columns; fourthly, paving a temporary ground; fifthly,performing the reinforcing construction of a left half foundation pit soil body; sixthly, constructing a left side underground continuous wall; seventhly, constructing a dewatering well; eighthly, erecting a first transverse support of a left half foundation pit; ninthly, performing dewatering on the foundation pit; tenthly, digging the foundation pit and reinforcing the stand columns; and eleventhly, constructing a subwa