Influence of rate effects, temperature and moisture content on the geomechanical behavior of marine clays

IF 1.3 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-19 DOI:10.1115/1.4063699

Vinícius Batista Godoy, Fernando Schnaid, Eduardo Cirio, Hugo Scheuermann Filho, Adriana Leonhardt, Inácio Abreu Pestana

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Abstract

The study of the geomechanical behavior of marine clays is a basic requirement for project optimization of the oil and natural gas industry. As part of a large-scale project, this study explored the effects of moisture content, temperature and rate effects using laboratory vane shear tests. A series of results has helped in the identification of the effects of ground freezing on the undrained shear strength. For temperatures below freezing (−2.0°C) the undrained shear strength increases with increasing water content and decreases with increasing shear rates for applied angular velocities in the range of 0.0025 to 0.015 rpm. Apparently, with the freezing of pore fluids, the shear strength is partially governed by the strength of the ice-soil particle bonds. The increase in shear rate appears to facilitate the breakage of the ice-bonds and afterwards the ice crystals reducing the viscous effects on the mobilized shear strength. Conversely, samples tested at temperatures above freezing, show an increase in undrained shear strength with the increase in the imposed angular velocity, and decreases with increasing soil moisture. Based on these studies, it is concluded that rate effects should be coupled to the influence of temperature and moisture content in design of offshore structures.

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速率效应、温度和含水量对海相粘土地质力学行为的影响

摘要研究海相粘土的地质力学行为是石油天然气工业项目优化的基本要求。作为一个大型项目的一部分，本研究利用实验室叶片剪切试验探索了含水量、温度和速率效应的影响。一系列研究结果有助于确定冻结对不排水抗剪强度的影响。当温度低于冰点(- 2.0°C)时，不排水抗剪强度随含水量的增加而增加，在0.0025 - 0.015 rpm范围内，随剪切速率的增加而降低。显然，随着孔隙流体的冻结，抗剪强度部分取决于冰-土颗粒结合的强度。剪切速率的增加似乎有利于冰键的破坏，随后冰晶的破坏降低了对动员剪切强度的粘性影响。相反，在高于冰点的温度下测试的样品显示，不排水抗剪强度随着施加角速度的增加而增加，随着土壤湿度的增加而降低。在此基础上得出结论，在海上结构设计中应将速率效应与温度和含水率的影响相结合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme 工程技术-工程：大洋

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Offshore Mechanics and Arctic Engineering is an international resource for original peer-reviewed research that advances the state of knowledge on all aspects of analysis, design, and technology development in ocean, offshore, arctic, and related fields. Its main goals are to provide a forum for timely and in-depth exchanges of scientific and technical information among researchers and engineers. It emphasizes fundamental research and development studies as well as review articles that offer either retrospective perspectives on well-established topics or exposures to innovative or novel developments. Case histories are not encouraged. The journal also documents significant developments in related fields and major accomplishments of renowned scientists by programming themed issues to record such events. Scope: Offshore Mechanics, Drilling Technology, Fixed and Floating Production Systems; Ocean Engineering, Hydrodynamics, and Ship Motions; Ocean Climate Statistics, Storms, Extremes, and Hurricanes; Structural Mechanics; Safety, Reliability, Risk Assessment, and Uncertainty Quantification; Riser Mechanics, Cable and Mooring Dynamics, Pipeline and Subsea Technology; Materials Engineering, Fatigue, Fracture, Welding Technology, Non-destructive Testing, Inspection Technologies, Corrosion Protection and Control; Fluid-structure Interaction, Computational Fluid Dynamics, Flow and Vortex-Induced Vibrations; Marine and Offshore Geotechnics, Soil Mechanics, Soil-pipeline Interaction; Ocean Renewable Energy; Ocean Space Utilization and Aquaculture Engineering; Petroleum Technology; Polar and Arctic Science and Technology, Ice Mechanics, Arctic Drilling and Exploration, Arctic Structures, Ice-structure and Ship Interaction, Permafrost Engineering, Arctic and Thermal Design.