高温作用下完整黄土的强度标准

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Bin Zhi, Cheng Wang, Enlong Liu, Zengle Li
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引用次数: 0

摘要

地热供暖制冷是一种利用地表地热能的新型建筑节能技术,其工作时会引起周围岩土体的温度变化,在黄土地区应用时会影响黄土的强度特性。为了研究温度作用下完整黄土强度的变化,本研究以我国西安地区的黄土为主要研究对象,在 5 ℃、20 ℃、50 ℃ 和 70 ℃ 四种不同温度下对完整黄土进行固结不排水三轴剪切试验,分析不同温度下完整黄土试件剪切强度的变化规律。结果表明,在不同温度作用下,黄土试件的应力-应变曲线呈现应变软化,而重塑黄土的应力-应变曲线呈现应变硬化,在相同约束压力下,黄土强度随温度升高而逐渐降低。基于岩土体的二元介质模型,考虑温度和约束压力的影响,对剪切分担比进行了修正。研究了剪切分担率随温度(T)、约束压力(sigma)、参数 m 和结构屈服强度(sigma)的变化。对完整黄土的强度判据进行了修正,建立了适用于高温条件下完整黄土的强度判据,并通过室内试验数据对强度判据进行了验证,结果表明强度判据对高温条件下完整黄土具有良好的适用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Strength criterion for intact loess under high-temperature action

Strength criterion for intact loess under high-temperature action

Geothermal heating and cooling is a new type of building energy-saving technology that utilizes surface geothermal energy, which causes temperature changes in the surrounding geotechnical bodies when it works, and affects the strength characteristics of loess when it is applied in loess areas. To investigate the change in the strength of intact loess under the effect of temperature, this study uses loess in the Xi'an area of China as the main research object and conducts consolidated undrained triaxial shear tests on intact loess at four different temperatures (5 ℃, 20 ℃, 50 ℃ and 70 ℃) to analyze the change law of shear strength of intact loess specimens under varying temperatures. The results show that the stress‒strain curves of loess specimens show strain softening under the effect of different temperatures, while the stress‒strain curves of remodeled loess show strain hardening, and the strength of loess gradually decreases with increasing temperature under the same confining pressure. Based on the binary medium modeling of a geotechnical body, the shear sharing ratio is modified by considering the effect of temperature and confining pressure. The variation in the shear sharing ratio with temperature \(T\), confining pressure \(\sigma\), parameter m, and structural yield strength \(\sigma_{s}\) is investigated. The strength criterion of intact loess is modified to establish a strength criterion applicable to intact loess under high temperatures, and the strength criterion is verified by indoor test data, which show that the strength criterion has good applicability to intact loess under high-temperature conditions.

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来源期刊
Bulletin of Engineering Geology and the Environment
Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合
CiteScore
7.10
自引率
11.90%
发文量
445
审稿时长
4.1 months
期刊介绍: Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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