Equidistant three-point seismic prospecting method for detecting deeply-buried nonmetallic pipeline

The invention relates to an equidistant three-point seismic prospecting method for detecting a deeply-buried nonmetallic pipeline, which comprises the following steps of: firstly, arranging three equidistant measuring points in a trend perpendicular to a detected pipeline and measuring the space d between two measuring points; secondly, respectively burying a sensor on the grounds where the threemeasuring points are positioned, respectively knocking besides the three sensors by using a hammer and obtaining the single-trip times t1, t2 and t3 between the three measuring points and the pipeline by using a testing apparatus (such as a seismograph); thirdly, measuring to obtain the speed v of a primary seismic wave of a soil layer above the pipeline; and fourthly, calculating by using a formula to obtain the position and the buried depth of the pipeline. The equidistant three-point seismic prospecting method for detecting the deeply-buried nonmetallic pipeline which is disclosed by the invention is scientific in