本文關(guān)鍵詞： 無(wú)水砂層 土壓平衡盾構(gòu) 排土 地層響應(yīng) 離散元　出處：《鄭州大學(xué)學(xué)報(bào)(工學(xué)版)》2017年01期 　論文類型：期刊論文

【摘要】：為闡明土壓平衡盾構(gòu)擠土與排土掘進(jìn)狀態(tài)對(duì)周圍土體的擾動(dòng)機(jī)理,采用離散元方法建立土倉(cāng)不排土與排土兩組盾構(gòu)掘進(jìn)二維數(shù)值模型,比較分析了兩種工況下盾構(gòu)掘進(jìn)時(shí)掌子面及周圍地層的細(xì)觀力學(xué)變化特征.研究表明:不排土工況下,盾構(gòu)對(duì)周圍土層有明顯擠密,土體豎向位移呈橢圓形、水平位移呈圓形向前方擴(kuò)散變小;排土工況下,刀盤(pán)周圍土體無(wú)明顯擠密,水平位移很小,豎向位移呈不規(guī)則漏斗狀向地表延伸變大.不排土對(duì)周圍土體應(yīng)力影響大,掌子面水平應(yīng)力分布均勻;排土工況下盾構(gòu)前方土體應(yīng)力與初始地層接近,土倉(cāng)的排土,使掌子面水平應(yīng)力的分布變化較大.
[Abstract]:In order to elucidate the disturbance mechanism of earth pressure balance shield tunneling state to surrounding soil mass, the discrete element method is used to establish two groups of two-dimensional numerical models for shield tunneling. In this paper, the characteristics of mesomechanical changes of the face of the shield and the surrounding strata during shield tunneling are compared and analyzed. The results show that the shield tunneling has obvious compaction to the surrounding soil layer and the vertical displacement of soil is elliptical under the condition of no soil displacement. The horizontal displacement becomes smaller in circular direction, the soil around the cutter head is not compacted obviously, the horizontal displacement is very small, and the vertical displacement extends to the ground in an irregular funnel-shaped manner, which has a great influence on the stress of the surrounding soil. The distribution of horizontal stress on palm plane is uniform, and the stress of soil in front of shield is close to the initial stratum under the condition of draining earth, which makes the distribution of horizontal stress of palm surface change greatly.
【作者單位】： 中南大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金青年資助項(xiàng)目(51208516) 中南大學(xué)研究生創(chuàng)新項(xiàng)目(2016zzts414)
【分類號(hào)】：U455.43

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