中南大学学报（自然科学版）2025，Vol.56Issue(4)：1417-1425,9.DOI:10.11817/j.issn.1672-7207.2025.04.014
考虑温度和压融效应的冻土强度准则研究
A new strength criterion for frozen soils considering temperature and pressure-melting effect
摘要
Abstract
Artificial ground freezing(AGF)is widely employed in shaft construction through unstable soil layers,particularly in deep underground engineering.Ensuring the safety and feasibility of AGF relies heavily on accurately predicting the strength of frozen soils.Frozen soil strength responds to increasing confining stress in three distinct stages:it initially increases,then decreases,and finally increases again at higher stress levels.To capture this complex behavior,a series of triaxial compression tests were conducted under varying confining pressures.Based on the framework of critical state soil mechanics,temperature-dependent strength criteria were developed to reflect this non-linear strength evolution.To further explain the strength reduction observed at intermediate stress levels,the mechanism of pressure-induced ice melting was examined.A physically meaningful pressure melting coefficient was introduced to quantify the relationship between cryogenic suction and stress.This resulted in the formulation of freezing characteristic curves corresponding to different stress levels.Building on these insights,a new strength criterion was established to account for the effects of both low and high stress conditions.Model predictions were validated against experimental data,demonstrating the ability to reproduce the observed strength evolution of frozen soils.The results show that compared with the existing strength criteria,the proposed model is physically interpretable,involves fewer and more easily measurable parameters,and thus offers greater potential for practical application in AGF-related engineering design.关键词
强度准则/冻土/温度/压融效应/低温吸力Key words
strength criterion/frozen soil/temperature/pressure melting effect/low temperature suction分类
建筑与水利引用本文复制引用
马博,滕继东,张升,盛岱超..考虑温度和压融效应的冻土强度准则研究[J].中南大学学报（自然科学版）,2025,56(4):1417-1425,9.基金项目
国家重点研发计划项目(2022YFB2603301) （2022YFB2603301）
国家自然科学基金资助项目(52178376,52178413) （52178376,52178413）
湖南省自然科学基金资助项目(2022JJ10076,2022JJ30593)(Project(2022YFB2603301)supported by the National Key Research and Development Plan （2022JJ10076,2022JJ30593）
Projects(52178376,52178413)supported by the National Natural Science Foundation of China （52178376,52178413）
Projects(2022JJ10076,2022JJ30593)supported by the Natural Science Foundation of Hunan Province) （2022JJ10076,2022JJ30593）
