Monitoring and early warning method for collapse geological disasters along oil and gas pipelines

The invention relates to the technical field of geological disaster early warning, and discloses a monitoring and early warning method for collapse geological disasters along an oil and gas pipeline. The method comprises the steps that 1, modeling analysis is conducted on a collapsed slope, it is determined that the collapsed slope comprises a collapsed rock mass and a non-collapsed slope face, and the bottom of the collapsed rock mass is a plastic zone; 2, obtaining the dead weight of the rock mass, the anti-sliding force of the rock mass on the slope surface and the sliding force of the rock mass, analyzing the pressure condition of a plastic zone from the rock mass when collapse occurs, and carrying out simulation calculation on the opening degree of a crack between the rock mass and the slope surface; and 3, making an early warning grade in combination with the crack opening degree, and giving out an early warning of the corresponding early warning grade according to the specific crack opening degree valu