南京工业大学学报（自然科学版）2026，Vol.48Issue(2)：239-246,8.DOI:10.3969/j.issn.1671-7627.2026.02.011
不同升温方式下饱和粉土孔压及不排水剪切特性分析
Analysis of pore pressure and undrained shear behavior of saturated silt under different heating methods
谢岚朦 1蒋刚 1张威锋 1沈楠杰2
作者信息
- 1. 南京工业大学交通运输工程学院,江苏 南京 210009
- 2. 中冶武勘工程技术有限公司,湖北武汉 430080
- 折叠
摘要
Abstract
Geothermal energy induces temperature changes that can alter soil properties,thus affecting the safety of underground energy engineering.To further investigate the influence of temperature change on the consolidation and strength characteristics of soil,undrained shear tests were conducted on saturated silt using a temperature-controlled triaxial test system.The effects of temperature on pore pressure and strength characteristics were analyzed under two heating methods;undrained heating and drained heating,for saturated silt from Nanjing.Ladd's normalized strength theory of soil was employed to analyze the undrained shear strength of the undrained heating specimens.The results are summarized as follows.During undrained heating,the pore pressure of saturated silt increases while the effective stress decreases.The transformation of effective stress leads the soil into an unstable stress state.The heating condition affects the development of pore pressure in the early stage of undrained shear:in undrained heating specimens,the accumulated thermal pore pressure slows the change in pore pressure during shearing,while in drained heating specimens,the initial pore pressure is zero,and the pore pressure rises quickly at the beginning of shearing.The heating path affects the early undrained shear behavior of saturated silt differently:undrained heating weakens the characteristic features of the specimen's stress-strain curve,while drained heating strengthens them.The greater the temperature rise,the more significant the weakening or strengthening effect.The thermal over-consolidation ratio(TOCR)effectively characterizes the influence of temperature on the undrained shear strength of the soil and can be described using Ladd's formula for the normalized shear strength of overconsolidated soils.关键词
饱和粉土/升温路径/不排水剪切/应力-应变特性/归一化强度Key words
saturated silt/heating path/undrained shear/stress-strain behavior/normalized strength分类
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谢岚朦,蒋刚,张威锋,沈楠杰..不同升温方式下饱和粉土孔压及不排水剪切特性分析[J].南京工业大学学报（自然科学版）,2026,48(2):239-246,8.
