三峡工程二期截流心墙部位平抛垫底砂砾石料能减缓汛后施工抛投强度，增大堰体部位深水处的密实性，同时也能节省工程量。本文提出的砂砾石料动水抛投的漂距特性成果，为现场施工提供了抛投依据；抛投料水下成型特性（如粗化、分层等）研究为防渗墙施工成槽及是否漏浆等问题的分析给出了参数。 The second-stage closure of the Three Gorges Dam central part of the hearth wall sand and gravel can slow the construction after throwing cast strength, increase the tightness of the weir parts of deep water, but also can save the project volume. In this paper, the results of the drift distance characteristics of sand-gravel hydrodynamic throwing provide the basis for cast-in-site construction; the cast-in-cast underwater forming characteristics (such as coarsening, stratification, etc.) Pulp and other issues are given the parameters of the analysis.