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岛礁上部碎屑沉积物对岛礁建设的影响举足轻重,在某岛礁建设过程中获取一定深度范围内的钙质砂,开展了室内大型直剪试验和大型高压固结试验,对钙质砂的剪切性能及压缩特性进行试验研究。试验结果表明:同级配情况下,咬合力C值受到剪切速率和粗粒料含量(P5)的共同影响。剪切速率增大时,咬合力C值逐渐减小,P5增大时咬合力C值呈增长趋势。珊瑚砂砾混合碎屑物的压缩变形与珊瑚砾块和珊瑚砂的质量组成有关,同时也受到含水量的影响。
The influence of clastic sediments in the upper reefs on the construction of island reefs plays an important role. During the construction of some islands and reefs, calcareous sand is obtained within a certain depth range. Large-scale direct shear tests and large-scale high-pressure consolidation tests are carried out. The shear properties and compression characteristics of the experimental study. The experimental results show that the bite force C is affected by both the shear rate and the coarse aggregate content (P5) under the same conditions. When the shear rate increases, the value of occlusal force C decreases gradually, and the value of occlusal force C increases with the increase of P5. The compressive deformation of coral gravel mixed debris is related to the mass composition of coral gravel and coral sand and is also affected by the water content.