A new similar material for fluid-solid coupling has been developed through hundreds of compounding tests based subsea on the theory of fluid-solid coupling on geomechanics model test and the exploration data of the Qingdao Kiaochow Bay tunnel. It is mixed with sand, barite powder, talc powder, cement, vaseline and silicone oil. The effect of different mixing ratios on the properties of the samples has been systematically studied and the main components controlling the material properties have been determined through large numbers of laboratory tests. The test results indicate that the new material's strength and elastic modulus are controlled by cement and vaseline; its cohesion is mainly effected by vaseline; its permeability coefficient can be adjusted by the ratio of vaseline and silicone oil. Water retention and compactness improvement are also the role of silicone oil. Deformation characteristics and permeability of the material are regulated by different compositions and the interaction is slight. So the properties of the material can be controlled comprehensively. The new material can simulate low-strength and medium-strength rock materials with different permeabilities, which is an ideal similar material for fluid-solid coupling. This material has been used in the Qingdao Kiaochow Bay subsea tunnel water-inflow model test, and its mechanical properties and permeability has met the test requirements. The new material ensures good test results.%依托青岛胶州湾海底隧道的现场勘探资料,应用地质力学模型试验的流-固耦合相似理论,通过大量的配比试验,研制出 种由砂、重晶石粉、滑石粉、水泥、凡士林、硅油和适量拌合水组成的新型流-固耦合相似材料(SCVO).通过大量的室内试验,系统地研究不同配比对材料参数的影响规律,确定控制相似材料各性能的主要组分.试验表明,材料的强度和弹性模量主要由水泥和凡士林控制；黏聚力受凡士林影响明显；渗透系数可以通过凡上林和硅油的比例调节;硅油还可以起到保水、提高材料密实度的作用.材料的变形特性和水理特性由不同的成分控制,且相互间影响很小,实现材料性质的全面调控.该材料可以模拟不同渗透性的低强度和中等强度的岩体材料,是一种非常理想的流-固耦合相似模拟材料.并已成功应用于青岛胶州湾海底隧道的地质力学模型试验研究中,力学性能和水理特性均达到试验要求,为试验取得良好结果提供材料保证.
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