Stability of methane hydrate bearing sands and efficient production method in methane hydrate exploitation from deep seabed

为研究甲烷水合物产砂过程中甲烷水合物砂体的变形规律，研制了高压低温平面应变测试仪。利用该装置进行了平面应变压缩试验和降压法甲烷水合物分解试验。通过图像分析，观察到了含甲烷水合物砂岩的剪切带。将前期研究中建立的MH持力土本构模型应用于有限元分析，分析了与试验相同的问题。分析结果与实验结果具有较好的一致性。

High pressure and low temperature plane strain testing apparatus was developed for visualizing deformation of methane hydrate bearing sand due to methane hydrate production. Using this testing apparatus, plane strain compression tests and methane hydrate dissociation test by depressurization method were performed. By using image analysis, shear band of methane hydrate bearing sand was observed. The constitutive model for MH bearing soils which was developed in the previous study was applied to FEM and was analyzed the same problem as the experiment. The analytical results had good corresponding with the experimental results.