楚雄州青山嘴水库工程为了优化大坝工程设计，改善大坝心墙填筑料的施工条件，降低工程造价，拟采用全强风化砂泥岩作心墙防渗土料使用，但砂岩及强风化料的掺入比例过高会影响土料的防渗效果。为了确定合适的砂岩及强风化料掺合比例，了解和掌握全强风化砂泥岩混合料的性能，把砂岩和强风化料按不同比例掺配组合进行试验研究，通过试验确定了全强风化砂泥岩混合料可以作心墙防渗土料使用，以强风化料所占比例小于60%，砂岩所占比例小于25%为宜，并总结了用砂泥岩风化料作心墙防渗土料使用应注意的技术问题。

In order to optimize the design of the dam project, improve the construction conditions of filling material of central core, and reduce project cost, we used entirely or strongly weathered sandstone and mudstone as impervious soil in Qingshanzui reservoir ,which is in Chuxiong state of Yunnan province. But the efficiency of seepage control will be affected by excessive mixture ratio of strongly weathered sandstone and mudstone.For the purpose of determining appropriate mixture ratio and finding properties of sandstone and strongly weathered material, we carried out several experiments, in which sandstone and strongly weathered material were mixed under different ratios. Through experiments, results show that, entirely or strongly weathered mixtures of sandstone and mudstone can be used as anti-seepage soil material for central core, and the rational mixture ratio for strongly weathered material is less than 60%, with sandstone less than 25%. Finally, several important technical issues are summarized for the forementioned material.