Tong Huidong, Chen Youliang, Du Xi, Chen Siyu, Pan Yungui, Wang Suran, Peng Bin, Azzam Rafig, Fernandez-Steeger Tomas Manuel
Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
Department of Engineering Geology and Hydrogeology, RWTH Aachen University, 52064 Aachen, Germany.
Materials (Basel). 2024 Feb 20;17(5):972. doi: 10.3390/ma17050972.
In order to optimize the efficiency and safety of gas hydrate extraction, it is essential to develop a credible constitutive model for sands containing hydrates. A model incorporating both cementation and damage was constructed to describe the behavior of hydrate-bearing cemented sand. This model is based on the critical state theory and builds upon previous studies. The damage factor is incorporated to consider soil degradation and the reduction in hydrate cementation, as described by plastic shear strain. A computer program was developed to simulate the mechanisms of cementation and damage evolution, as well as the stress-strain curves of hydrate-bearing cemented sand. The results indicate that the model replicates the mechanical behavior of soil cementation and soil deterioration caused by impairment well. By comparing the theoretical curves with the experimental data, the compliance of the model was calculated to be more than 90 percent. The new state-dependent elasto-plastic constitutive model based on cementation and damage of hydrate-bearing cemented sand could provide vital guidance for the construction of deep-buried tunnels, extraction of hydrocarbon compounds, and development of resources.
为了优化天然气水合物开采的效率和安全性，开发一种可靠的含天然气水合物砂土本构模型至关重要。构建了一个同时包含胶结和损伤的模型来描述含天然气水合物胶结砂土的行为。该模型基于临界状态理论，并在以往研究的基础上建立。损伤因子被纳入，以考虑如塑性剪应变所描述的土体劣化和水合物胶结作用的降低。开发了一个计算机程序来模拟胶结和损伤演化机制以及含天然气水合物胶结砂土的应力-应变曲线。结果表明，该模型能够很好地再现土体胶结和损伤导致的力学行为。通过将理论曲线与实验数据进行比较，计算得出该模型的拟合度超过90%。基于含天然气水合物胶结砂土胶结和损伤的新的状态依赖弹塑性本构模型可为深埋隧道建设、碳氢化合物开采和资源开发提供重要指导。
