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A simple framework for describing strength of saturated frozen soils as multi-phase coupled system

机译：一种简单的框架，用于描述饱和冻土的强度作为多相耦合系统

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摘要

Frozen soils are characterised by the co-existence of ice and unfrozen liquid water in the pores, engendering complex interactions between thermal, hydraulic and mechanical processes within a system. The consequence is reflected in the peculiar features seen in frozen soils' deformation behaviour and strength. This study applies a re-interpretation to a constitutive modelling framework for frozen soils originally proposed by Nishimura and co-workers in 2009 and demonstrates its expediency in describing some of the key features of frozen soils' strength. The framework adopts a suction-equivalent stress, s, and an effective stress, p', with a critical state line (CSL) common to both frozen and unfrozen states, following a postulate put forward by Ladanyi and Morel in 1990. The influence of temperature, density and confining pressure application before and after freezing on the ultimate strength is rationally reproduced by simple criteria combining pore ice tensile failure and the CSL within the framework, while it is seamlessly continuous to conventional unfrozen critical state soil mechanics above the freezing temperature. Such complex phenomena as the multi-stage pressure dependency of the frozen strength, originally noted by Chamberlain and co-workers in 1972, are shown to be described generally well for clays and sands.
机译：冻土的特征在于孔中的冰和未冷却液体水的共存，在系统内的热，液压和机械过程之间的复杂相互作用。结果反映在冷冻土壤变形行为和强度中看到的特殊特征。本研究适用于2009年最初由Nishimura和Co-Workers提出的冰冻土壤的构建框架的重新解释，并展示了它的权宜之计，描述了冷冻土壤强度的一些关键特征。在1990年Ladanyi和Morel的假设之后，该框架采用了吸入量的应力，S和有效的应力，P'，冻结和联接州的临界状态线（CSL），冻结和联接态在1990年提出的假设。在冻结前和冻结前后的温度，密度和狭窄的压力应用是通过结合孔冰拉伸破坏和框架内的CSL的简单标准合理再现，而在冷冻温度之上，它无缝地连续。这种复杂现象作为冻结强度的多级压力依赖性，最初由1972年的伯文和同官员指出的冻结强度，如1972年的同副工人所示，用于粘土和砂脂。

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  • 来源
    《Geotechnique》 |2019年第8期|659-671|共13页
  • 作者

    Nishimura Satoshi; Wang Jinyuan;

  • 作者单位

    Hokkaido Univ Fac Engn Div Field Engn Environm Sapporo Hokkaido Japan;

    Wuhan Univ State Key Lab Water Resources & Hydropower Engn S Wuhan Hubei Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ground freezing; shear strength; temperature effects;

    机译：冻结;剪切强度;温度效果;

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