Stability control of coal mining face. According to the data of Douding. com, rectangular pipe jacking technology is a kind of pipeline burying construction technology with no excavation or less excavation, and its core is the stability control of excavation face. In the working pit, the jacking force generated by the jacking equipment can overcome the friction between the pipeline and the surrounding soil, jack the pipeline into the soil according to the design slope, and transport the earthwork away.