The invention relates to a solidification and pore forming method for a
coal rock stratum containing weak structural bodies. The solidification and pore forming method comprises the following steps that 1, a plurality of solidification holes are drilled, specifically, the solidification holes are formed according to the range of the weak structural bodies of the
coal rock stratum to be solidified; 2, bacterium liquid, stationary liquid and cementing liquid are sequentially injected in the holes in a pressurization mode through grouting pipes, and
calcium carbonate is induced to crystallize through a MICP in-situ grouting technology; and 3, after fractures and the weak structures around the solidification holes are solidified through the
microorganism slurry, production is organized in solidification positions according to the subsequent process. On the one hand, microorganisms are adsorbed on the surfaces of pores and the fractures around the drilling holes, the
calcium carbonate is effectively induced to precipitate, and the inner surface of the
coal (rock) stratum is bonded and cemented, and surrounding rock with the soft characteristic is solidified and cemented to form a whole with certain mechanical properties, so that the strength of hole wall surrounding rock is strengthened; and on the other hand, the
microorganism slurry is a solution or suspension liquid, the
viscosity of the
slurry is low, fluidity is good, permeability is strong, compared with a
chemical treatment method, the limit grouting pressure is small, the solidification
radius is large, and the cementation strength of the drilling hole surrounding rock can be regulated and controlled.