水合物沉积物三轴试验存在的关键问题分析

Key Issues for Triaxial Test of Hydrate-Bearing Sediment

三轴剪切试验是获得含水合物沉积物强度参数最有效的途径之一。目前国内研究者从不同的角度进行了大量研究,在某些关键科学问题上形成了共识,但仍存在诸多科学问题需要业内同仁共同探讨。本文在充分调研国内外含水合物沉积物三轴力学测试成果的基础上指出:由于缺乏统一的测试标准和规范,目前国内含水合物沉积物三轴剪切试验仍存在不同研究成果横向可比较性差、经验模型通用性不足、测试结果与现场实际差距大等关键科学问题;制样方法、粒度分布规律、沉积物本身固结程度、试验温度、剪切速率、气体类型、饱和度测量方法、试样尺寸等的差异是造成上述问题的关键因素。为了增强研究成果的指导意义,笔者建议各研究者在发表研究成果的同时公布详细的测试方法和测试条件,通过建立统一的行业标准来促进含水合物沉积物三轴剪切试验的发展,从而为水合物资源的安全高效开采提供科学依据。

Triaxial test is one of the effective and direct ways to obtain strength parameters of hydrate-bearing sediments.Current researches have reached consensuses on some scientific issues, but there are still many critical problems left to bediscussed. Extensive literature investigation shows that different research results are profoundly different, empirical modelscan’t be used universally because of lacking of unified testing standard or method. There is still a gap betweenexperimental results and mineral conditions. Difference of sample preparation method, particle size distribution, degree ofconsolidation, test temperature, shearing rate, gas type, hydrate saturation decision method and sample size are criticalfactors lead to the above problems. Thus, in order to strengthen guiding significance of test result, detailed experimentalconditions and test method should be announced when publishing research papers. What’s more, establishing a unifiedtesting standard and method is extremely urgent for triaxial test of hydrate-bearing sediment.