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摘要:
描述含水合物沉积介质的应力-应变关系，建立含水合物沉积介质的力学模型，预测水合物储层的变形规律，是有效开发水合物资源的基本前提。以经典邓肯-张模型为基础，结合细砂质含水合物沉积介质力学三轴试验数据，提出了适合细砂质含水合物沉积介质的非线性弹性力学模型及其参数，并验证了模型的准确性。结果表明，该模型及其参数可以很好地描述细砂质含水合物沉积介质的应力-应变的非线性弹性关系。
Abstract:Describing the stress-strain relationship of hydrate-bearing sediments, establishing a mechanical model of hydrate-bearing sediments and predicting the deformation of hydrate reservoirs are the basic prerequisites for the effective development of hydrate resources. In this study, the triaxial compressive properties of fine sandy hydrate-bearing sediments are analyzed to examine the applicability of a nonlinear elastic constitutive model based on the Duncan-Chang model. It is shown that the proposed model can describe the stress-strain behavior of fine sandy hydrate-bearing sediments, which demonstrates the validity and reasonability of this model.
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表 1 细砂质含水合物沉积介质强度的基本参数
Table 1. Basic parameter for strength of fine sandy hydrate-bearing sediments
试样 α(-) β(-) φ/(°) c0/MPa 含水合物沉积介质 0.003 2.1 9.54 1.414 
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表 2 细砂质含水合物沉积介质初始弹性模量公式的基本参数
Table 2. Basic parameters for initial tangent elastic modulus of fine sandy hydrate-bearing sediments
试样 γ(-) δ(-) ei0/MPa n(-) 含水合物沉积介质 0.0015 2.01 395 0.7
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