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張智敏

（中鐵一院集團(tuán) 陜西鐵道工程勘察有限公司，陜西 西安 710043）

摘 要：以煤巖為研究對(duì)象，進(jìn)行不同浸潤時(shí)間下的單軸壓縮蠕變試驗(yàn)。試驗(yàn)表明，煤巖在軸向應(yīng)力加載瞬間，產(chǎn)生瞬時(shí)彈性應(yīng)變，接著出現(xiàn)衰減、穩(wěn)定蠕變，當(dāng)加載應(yīng)力高于長期強(qiáng)度時(shí)，表現(xiàn)出加速蠕變行為；通過等時(shí)應(yīng)力-應(yīng)變曲線求拐點(diǎn)的方式，確定煤巖長期強(qiáng)度，隨著浸潤時(shí)間的增長而遞減。基于煤巖蠕變的黏彈塑性，確定基礎(chǔ)蠕變模型，利用考慮損傷的Hooke體描述煤巖瞬時(shí)彈性應(yīng)變，分?jǐn)?shù)階黏滯體表征黏彈性應(yīng)變，分?jǐn)?shù)階黏塑性體反映黏塑性應(yīng)變，構(gòu)建一個(gè)新的改進(jìn)后的煤巖蠕變力學(xué)模型。結(jié)果表明，改進(jìn)后模型對(duì)煤巖蠕 變曲線具有良好模擬效果，能較為準(zhǔn)確反映煤巖在不同浸潤時(shí)間下的蠕變力學(xué)行為。

關(guān)鍵詞：浸潤時(shí)間；煤巖；加速蠕變；長期強(qiáng)度；模型

中圖分類號(hào)：TD315            

文獻(xiàn)標(biāo)志碼：A     

文章編號(hào)：1005-8249（2024）02-0039-06

DOI：10.19860/j.cnki.issn1005-8249.2024.02.008

 

ZHANG Zhimin

(China Railway First Institute Group Shaanxi Railway Engineering Survey Co., Ltd.,  Xi'an 710043，China)

Abstract: Conduct uniaxial compression creep tests on coal and rock under different infiltration times. The experiment shows that coal rock undergoes instantaneous elastic strain at the moment of axial stress loading, followed by attenuation and stable creep. When the loading stress is higher than the long-term strength, it exhibits accelerated creep behavior; By calculating the inflection point through the isochronous stress-strain curve, the long-term strength of coal and rock is determined, which decreases with the increase of infiltration time. Based on the viscoelastic plasticity of coal rock creep, a basic creep model is determined. The Hooke volume considering damage is used to describe the instantaneous elastic strain of coal rock, the fractional order viscous body represents the viscoelastic strain, and the fractional order viscous plastic body reflects the viscoelastic strain. A new improved mechanical model of coal rock creep is constructed. The results indicate that the improved model has a good simulation effect on the creep curve of coal and rock, and can accurately reflect the creep mechanical behavior of coal and rock under different infiltration times.

Keywords: infiltration time; coal rock; accelerated creep; long-term strength; model

*基金項(xiàng)目：中國地質(zhì)調(diào)查局二級(jí)項(xiàng)目（DD20201119）。

作者簡介：張智敏（1987—），男，滿族，本科，工程師，主要研究方向：地質(zhì)勘察工作。

收稿日期：2023-08-17