气体水合物喷射合成与直剪试验系统的研制与应用  

Development and application of gas hydrate injection synthesis and direct shear test system

作　　者：周远 韦昌富[1] 周家作[1] 陈盼[1] 魏厚振[1] ZHOU Yuan;WEI Chang-fu;ZHOU Jia-zuo;CHEN Pan;WEI Hou-zhen(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中国科学院大学,北京100049

出　　处：《岩土力学》2021年第8期2311-2320,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51939011,No.51639008,No.11962004)。

摘　　要：为更好研究不同赋存模式对含水合物土力学特性影响,克服现有非饱和制样法的局限,研制了气体水合物喷射合成与直剪试验系统,系统包括水合物喷射合成子系统和含水合物土低温高压直剪子系统。水合物喷射合成装置是在高压低温的环境中,通过喷射水雾,水雾与气体反应快速合成水合物,通过这种方法可快速高效地制备持力体型气体水合物。直剪系统可使用非饱和法和水合物粉混合法两种方法制备含水合物土,不同的制样方法对应着不同的赋存模式。直剪试验可比较不同赋存模式下含水合物土的强度,以泥质粉细砂和二氧化碳水合物为试验材料,进行了胶结型和填充型水合物的直剪试验。结果表明,相同水合物饱和度下,胶结型水合物的强度大于填充型水合物强度,最终检验了仪器的可靠性。To better explore the effect of different hydrate habits on the mechanical properties of hydrate-bearing soils,a combined injection synthesis and direct shear testing system has been developed.The system includes a hydrate injection synthesis setup and a hydrate-bearing soil direct shear apparatus under low temperature and high pressure conditions.The sprayed water mists can widely contact with hydrate-forming gas using the spraying water equipment,and thus gas hydrate can be synthesized quickly and efficiently under the high-pressure and low-temperature environment in the container.The system can be used to prepare hydrate-bearing samples by combining the unsaturated method and the hydrate powder mixing method.Different sample preparation methods correspond to different hydrate habits.Hence,the new direct shear tests can compare the shear strength of hydrate-bearing soil under different hydrate habits.Using silty sand and carbon dioxide hydrate as the tested materials,the direct shear tests of cemented and pore-filling hydrates were carried out.The results show that the shear strength of hydrate-bearing soil is higher for the cementation habit than for the pore-filling habit,which verifies the reliability of the instrument.

关 键 词：水合物粉混合法 非饱和法 直剪试验 强度 

分 类 号：TU433[建筑科学—岩土工程]