Horizontal curtain for confined water control in deep underground space development and implementation method

The invention provides a horizontal curtain for confined water control in deep underground space development and an implementation method, and the horizontal curtain comprises a cement soil reinforcement body formed in a deep confined water-containing stratum in an underground space development range, and the cement soil reinforcement body comprises a plurality of cement soil pile bodies; the multiple cement soil pile bodies are sequentially and mutually connected in a lap joint mode to form a horizontal curtain which is continuous in the horizontal direction, and the horizontal curtain and a vertical curtain on the periphery of the underground space are enclosed into a whole to partition confined water in the development range of the underground space. The horizontal bottom sealing curtain is arranged in the deep pressure-bearing water-containing stratum, so that pressure-bearing water is completely isolated in the deep underground space development range, the influence of pumping and lowering of the pressur