Abstract: The present invention relates to a moving block train operation control method and system based on train autonomous positioning, where the method is centered on a train-mounted device, autonomous positioning and integrity checking are implemented for the train-mounted device through satellites, and a movement authority and a target distance curve are calculated according to a real-time position, speed, and line state of a preceding train and in combination with train-to-train communication train safety protection technology, thereby achieving moving block. Compared with the prior art, the present invention has the advantages that line use efficiency, system work efficiency and operation efficiency are improved, a quantity of railside devices is reduced, and system construction and maintenance costs are reduced.

Abstract: It discloses a sustained release grouting material, a preparation method and an application thereof; the sustained release grouting material comprises a water swelling core and a water-soluble sustained release coating, the water swelling core is composed of bentonite, SAP and xanthan gum, which is granulated by disc granulator relying on the cohesiveness of xanthan gum; the water-soluble sustained-release coating is prepared by mixing water-soluble starch, polyvinyl alcohol, poloxamer, lubricant and plasticizer with deionized water to obtain a film-forming solution, and the film-forming solution is coated on a coating machine; the invention uses a coating machine to coat a layer of slow-release coating on the surface of the water-absorbing expansion core, and adjusts the coating thickness by controlling the mass ratio of the coating film-forming liquid to the water-absorbing expansion core particles, so as to realize the controllable water absorption onset time of the expansion core.