Crystallization blockage simulation test device and method for karst area tunnel drainage system

The invention discloses a crystallization blockage simulation test device for a karst area tunnel drainage system. A primary support model is arranged on a bracket, primary support model annular wallsare arranged at the front and rear ends of the primary support model, water collecting grooves are formed in the left and right sides and the upper surface is provided with a longitudinal watering pipe and an annular watering pipe which are communicated with each other. Water guide pipes are arranged on the water collecting tanks at the two sides in a communicating manner. A drainage valve is arranged on the water guide pipe and is communicated with a drainage system, and the drainage system is communicated with the filtering device. A monitoring device is arranged above the drainage system.The monitoring device transmits signals to a computer, and the drainage system is supported by an adjustable support arranged on the ground. The filtering device is communicated with the water supplytank through a water return