凍融循環(huán)作用下土體特性研究進(jìn)展
本文選題:凍融循環(huán) 切入點(diǎn):凍融破壞 出處:《太原理工大學(xué)學(xué)報(bào)》2017年03期
【摘要】:中國(guó)具有廣大的季節(jié)性?xún)鐾恋貐^(qū),研究?jī)鋈谘h(huán)作用下土體的物理力學(xué)特性,對(duì)需滿(mǎn)足一定強(qiáng)度及穩(wěn)定性要求的寒區(qū)工程建設(shè)與防護(hù)具有十分重要的指導(dǎo)意義。凍融循環(huán)試驗(yàn)是研究土體凍融特性的基礎(chǔ)性試驗(yàn),主要涉及凍融溫度、凍融時(shí)長(zhǎng)及凍融次數(shù)3個(gè)試驗(yàn)指標(biāo)的選擇,但目前相關(guān)學(xué)者的研究對(duì)此并未給出相對(duì)統(tǒng)一的參考依據(jù),給試驗(yàn)方案的確定及試驗(yàn)結(jié)果的相互對(duì)照造成不便。對(duì)目前土體凍融破壞新進(jìn)展進(jìn)行了全面綜述,分析并介紹了國(guó)內(nèi)外凍融試驗(yàn)方案的確定思路,提出建議性方案;并論述了凍融溫度、凍融次數(shù)、含水率、塑性指數(shù)等對(duì)土體凍融破壞的影響及凍融循環(huán)作用下土體物理力學(xué)性能的研究進(jìn)展;最后,提出了目前關(guān)于土體在凍融損傷機(jī)理及本構(gòu)模型等方面存在的不足及展望。
[Abstract]:There are many seasonal frozen soil regions in China. It is very important to study the physical and mechanical properties of soil under freeze-thaw cycle for the construction and protection of cold regions which need to meet the requirements of strength and stability.Freeze-thaw cycle test is a basic test to study the characteristics of soil freeze-thaw, which mainly involves the selection of three test indexes, such as freezing and thawing temperature, duration and times of freezing and thawing.It is inconvenient to confirm the test scheme and compare the test results.In this paper, the new progress of freezing and thawing failure of soil is comprehensively reviewed, the determination of the test scheme at home and abroad is analyzed and introduced, and the suggestion scheme is put forward, and the freezing and thawing temperature, the times of freezing and thawing, the moisture content, the temperature of freezing and thawing are also discussed.The influence of plastic index on the freeze-thaw failure of soil and the research progress of physical and mechanical properties of soil under freeze-thaw cycle are also discussed. Finally, the shortcomings and prospects of the mechanism of freeze-thaw damage and constitutive model of soil are put forward.
【作者單位】: 太原理工大學(xué)建筑與土木工程學(xué)院;
【基金】:山西省國(guó)際科技合作項(xiàng)目(2015081055) 山西省研究生教育創(chuàng)新項(xiàng)目(2015BY25)
【分類(lèi)號(hào)】:TU43
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