本文選題：凍結(jié)壁 + 統(tǒng)一強(qiáng)度理論　； 參考：《現(xiàn)代隧道技術(shù)》2017年05期

【摘要】：文章基于統(tǒng)一強(qiáng)度理論,考慮中間主應(yīng)力的影響,采用卸載狀態(tài)下凍結(jié)壁-周圍土體共同作用的凍結(jié)壁力學(xué)模型,推導(dǎo)得到凍結(jié)壁彈性區(qū)和塑性區(qū)的應(yīng)力場、位移場,并分別建立了凍結(jié)壁彈性極限外載、塑性極限外載、彈塑性外載的統(tǒng)一解,分析了凍結(jié)壁的應(yīng)力場、位移場隨半徑、強(qiáng)度理論參數(shù)的變化規(guī)律,討論了半徑比、強(qiáng)度理論參數(shù)及凍結(jié)壁計算深度對各個統(tǒng)一解的影響。結(jié)果表明,半徑和強(qiáng)度理論參數(shù)對凍結(jié)壁的應(yīng)力場、位移場均有一定程度的影響,考慮中間主應(yīng)力的影響可得到更精確的計算結(jié)果;凍結(jié)壁的彈性極限外載、塑性極限外載均隨半徑比和強(qiáng)度理論參數(shù)的增大而增大;彈塑性狀態(tài)下凍結(jié)壁的外載隨凍結(jié)深度的增大而減小,隨強(qiáng)度理論參數(shù)的增大而增大;凍結(jié)壁的外載比原始水平應(yīng)力低,是由卸載狀態(tài)下凍結(jié)壁與周圍土體共同作用決定的。該結(jié)果可為凍結(jié)壁的設(shè)計及工程應(yīng)用提供一定的參考。
[Abstract]:Based on the unified strength theory and considering the effect of intermediate principal stress, the stress field and displacement field of the elastic zone and plastic zone of frozen wall are derived by using the mechanical model of freezing wall under unloading condition. The unified solutions of elastic limit external load, plastic limit external load and elastoplastic external load of frozen wall are established respectively. The variation law of stress field, displacement field with radius and strength theoretical parameters of frozen wall are analyzed, and the radius ratio is discussed. The influence of theoretical parameters of strength and calculation depth of freezing wall on each unified solution. The results show that the radius and strength theory parameters have some influence on the stress field and displacement field of the frozen wall to some extent, considering the influence of the intermediate principal stress, the calculation results can be obtained more accurately, and the elastic limit external load of the frozen wall can be obtained. The plastic limit load increases with the increase of radius ratio and strength theoretical parameters, and decreases with the increase of freezing depth and increases with the increase of strength theoretical parameters in elastic-plastic state. The external load of the frozen wall is lower than that of the original horizontal stress, which is determined by the interaction between the freezing wall and the surrounding soil under unloading condition. The results can provide some reference for the design and engineering application of freezing wall.
【作者單位】： 長安大學(xué)建筑工程學(xué)院;長安大學(xué)地質(zhì)工程與測繪學(xué)院;
【基金】：國家自然科學(xué)基金項目(41202191) 中國博士后科學(xué)基金項目(2014M562358) 陜西省自然科學(xué)基礎(chǔ)研究計劃項目(2015JM4146) 中央高�；究蒲袠I(yè)務(wù)費專項資金項目(310828173402) 長安大學(xué)優(yōu)秀博士學(xué)位論文培育資助項目(310828150018)
【分類號】：TB12

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