密实砂－膨润土混合物作为高放废料地质处置的缓冲材料，人们越来越关心它的性质。通过大量的试验，研究了密实砂－膨润土的膨胀特性，阐明了其膨胀过程和方式，得出了一些有意义的结论。 As a buffer material for geological disposal of high-level radioactive waste, the dense sand-bentonite mixture has become more and more concerned about its nature. Through a large number of experiments, the expansion characteristics of the compacted sand-bentonite were studied, the expansion process and the way were expounded, and some meaningful conclusions were drawn.