介绍了淮南线采用土工固格网、换砂法整治基床下沉病害的措施，并且从列车荷载作用下基床土动应力和土工固格网动应变的实测数据，分析了土工固格网加固基床的机理。分析表明，用土工固格网加固砂层后，与传统的换砂法相比，更有效地改善了基床土的动应力，而且轨面稳定快，节省投资，有利于提速增效。 This paper introduces the measures of using the geotextile mesh and sand changing method to treat subsidence of the bed in Huainan line, and analyzes the geotextile reinforcement by the measured data of soil dynamic stress and geotextile dynamic strain of the foundation bed under train load. The bed mechanism. The analysis shows that compared with the traditional sand removal method, the dynamic stress of the bed soil is more effectively improved by the consolidation of the geotextile mesh, and the rail surface is stabilized quickly and saves investment, which is in favor of speeding and efficiency increase.