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在自主研制的实验装置上合成甲烷水合物,采用时域反射技术(TDR)实时监测甲烷水合物生成过程中饱和度的变化,并与系统的压力降法计算的饱和度进行了对比。结果表明TDR法简单易行,结果可靠。对含甲烷水合物沉积物进行了一系列不排水三轴压缩实验,结果表明,含甲烷水合物沉积物的抗剪强度随着有效围压的增加和水合物饱和度的增加而增大;粘聚力随着甲烷水合物饱和度的增加而明显增加,但内摩擦角变化并不显著。在此基础上,提出了抗剪强度与有效围压和水合物饱和度的关系模型。
Methane hydrate was synthesized on a self-developed experimental setup. The time-domain reflectometry (TDR) was used to monitor the saturation changes during the formation of methane hydrate in real time, and compared with the saturation calculated by the pressure drop method. The results show that the TDR method is simple and reliable, the results are reliable. A series of undrained triaxial compression tests on methane hydrate sediments show that the shear strength of methane hydrate-containing sediments increases with increasing effective confining pressure and hydrate saturation. Cohesion increases with the increase of methane hydrate saturation, but the change of internal friction angle is not significant. On this basis, the relationship between shear strength and effective confining pressure and hydrate saturation is proposed.