The invention discloses a construction method for an extension model of a
slurry splitting
fissure in a clay stratum. The construction method comprises the steps that 1, the clay stratum is formed; 2,a steel
pipe is embedded into the clay stratum, a
slurry pressurizing
pipe is connected to the bottom end of the steel
pipe, and pressurizing holes are formed in the
peripheral surface of the slurrypressurizing pipe; 3, a pressurizing device is started to form
slurry splitting; and 4, it is assumed that the
fissure extends in a circular plate-shaped space, the perimeter of the circular plate-shaped space and the time for reaching the perimeter are calculated, or it is assumed that the slurry splitting
fissure extends in a semielliptical plate-shaped space and the semiellipse is simplified into a trapezoid, the extension speed of the semi-
minor axis of the semielliptical plate-shaped space, the
long axis length of the semiellipse and the time for reaching the
long axis length are calculated. According to the construction method, parameters such as the extension speed and the total extension amount of the splitting fissure can be calculated through the constructed model, quantization of related parameters in the slurry splitting process is achieved, and reference is provided for studying the slurry splitting extension mechanism.