本文關(guān)鍵詞： 巖石力學(xué) 線性熱膨脹系數(shù) 本構(gòu)模型 彈塑性　出處：《巖石力學(xué)與工程學(xué)報(bào)》2017年03期 　論文類型：期刊論文

【摘要】：在核廢料貯存、地?zé)岷蜕畈坎傻V等領(lǐng)域中,溫度對(duì)軟巖力學(xué)特性的影響不容忽視�；谏县�(fù)荷面和溫度等效應(yīng)力概念,提出一個(gè)考慮結(jié)構(gòu)性的軟巖熱彈塑性模型。該模型比上負(fù)荷面模型僅多一個(gè)參量,即線性熱膨脹系數(shù)。計(jì)算分析及其與試驗(yàn)結(jié)果對(duì)比表明,該模型既能夠統(tǒng)一描述軟巖熱增強(qiáng)和熱減弱2種現(xiàn)象。軟巖初始結(jié)構(gòu)性愈強(qiáng),強(qiáng)度愈大,且初始結(jié)構(gòu)性的變化可使軟巖在熱增強(qiáng)和熱減弱之間相互轉(zhuǎn)換。無論熱增強(qiáng)或者熱減弱,線性熱膨脹系數(shù)越大或者溫度越高,結(jié)構(gòu)性狀態(tài)變量的消散均會(huì)加快;并且,當(dāng)線性熱膨脹系數(shù)和溫度均較高時(shí),這種加速趨勢(shì)會(huì)更為顯著;相較于熱減弱和熱增強(qiáng)情況下的結(jié)構(gòu)性更容易消散,即消散速率更快。
[Abstract]:In the fields of nuclear waste storage, geothermal and deep mining, the influence of temperature on the mechanical properties of soft rock can not be ignored. A thermoelastic-plastic model of soft rock considering structure is proposed. The model is only one more parameter than the upper load surface model, that is, the coefficient of thermal expansion. The model can describe both the thermal enhancement and the thermal weakening of soft rock. The stronger the initial structure of soft rock is, the stronger the strength of soft rock is. The change of initial structure can make the soft rock transform between thermal enhancement and thermal weakening. The larger the coefficient of linear thermal expansion or the higher the temperature, the faster the dissipation of structural state variables will be. When the linear thermal expansion coefficient and temperature are both higher, the acceleration trend is more obvious, and the structure dissipates more easily than that under the condition of heat weakening and thermal strengthening, that is, the dissipation rate is faster.
【作者單位】： 中南大學(xué)土木工程學(xué)院;中南大學(xué)高速鐵路建造技術(shù)國家工程實(shí)驗(yàn)室;名古屋工業(yè)大學(xué);
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2014CB047001) 國家自然科學(xué)基金資助項(xiàng)目(51508578)~~
【分類號(hào)】：TU45
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本文編號(hào)：1504282