为实现岛礁珊瑚泥的有效利用，对岛礁珊瑚泥性能进行探究，发现岛礁珊瑚泥作为工程材料利用时存在龟裂现象，因此对珊瑚泥进行龟裂及改性研究具有现实意义。首先，引入羟丙基甲基纤维素（HPMC）与珊瑚泥制备室内面层模型进行龟裂试验，在不同时段对试验模型进行图像采集，并通过图像处理技术获取珊瑚泥相关参数变化；其次，探究HPMC改性后珊瑚泥裂隙参数、裂隙发育速率等龟裂参数的变化规律及珊瑚泥裂隙的动态演化规律；最后，分析HPMC对珊瑚泥龟裂行为的抑制作用并对抑裂机制进行阐述。研究结果表明：HPMC的加入，可明显改善珊瑚泥土样龟裂性质，通过减少土样内自由水含量，在土样内部吸附珊瑚泥颗粒形成团聚体阻止土体收缩并抑制裂隙生成，显著优化珊瑚泥面层的整体性能和抗裂性能。

In order to achieve the effective use of island reef coral mud, the performance of island reef coral mud was investigated, and it was found that there was a cracking phenomenon when the island reef coral mud was utilised as an engineering material, so it is of practical significance to carry out the research on the cracking and modification of coral mud. Firstly, hydroxypropyl methyl cellulose (HPMC) and coral mud were introduced to prepare an indoor surface model for the cracking test. Images were captured at different time periods and then the changes in coral mud related parameters were obtained by image processing techniques; Secondly, the changing law of coral mud cracking parameters, crack development rate and other parameters and the dynamic evolution law of coral mud crack after HPMC modification were investigated; Finally, the inhibitory effect of HPMC on the cracking behaviour of coral mud was analysed and the cracking inhibition mechanism was described. The results of the study show that the addition of HPMC can significantly improve the cracking properties of coral mud soil samples, and HPMC can prevent the contraction of the soil body and inhibit the generation of cracks by reducing the content of free water in the soil samples and adsorbing the coral mud particles inside the soil samples to form agglomerates, which can significantly optimise the overall performance of the coral mud surface layer and the anti-cracking performance.

TU443

中央高校基本科研业务费资助(NO. 2022CDJQY-012)