本文選題：頂管　切入點：觸變泥漿　出處：《東北大學(xué)》2014年碩士論文

【摘要】：在頂管施工中,為了在土中順利頂進(jìn)管道,千斤頂?shù)捻斄π枰朔鞣N阻力及外界因素的影響(糾偏、后背位移)；為了減小頂進(jìn)時管節(jié)外壁的摩擦阻力,在管節(jié)與土體間注有減摩用的觸變泥漿；因此,施工中的頂力控制與施工穩(wěn)定性的研究將對實施頂管工程具有較大的工程價值。論文以沈陽地區(qū)砂土層大直徑頂管工程為工程背景,采用數(shù)值模擬結(jié)合現(xiàn)場監(jiān)測的手段進(jìn)行研究。沈陽地區(qū)以砂礫(卵)石土層為主,頂進(jìn)大直徑頂管可借鑒的工程經(jīng)驗并不多,因此首先從數(shù)值模擬的角度,提出了初始頂力預(yù)估頂進(jìn)過程中所需頂力的方法,并與實際監(jiān)測結(jié)果進(jìn)行了對比,然后對沈陽地區(qū)頂管頂進(jìn)中的觸變泥漿配合比進(jìn)行了分析,比較了7種漿體的頂力曲線。并對注漿施工、糾偏施工過程中的穩(wěn)定性情況進(jìn)行了分析,最后基于強度折減法的計算原理得到了頂管工程施工開挖面的安全系數(shù)。研究結(jié)果表明,采用數(shù)值模擬方法進(jìn)行頂管頂進(jìn)過程中的頂力預(yù)估,并為中繼間的合理布置提供參考是可行的；沈陽地區(qū)頂管施工優(yōu)化的觸變泥漿膨潤土與水的質(zhì)量配比為1：9,并且觸變泥漿中的用水量對于減阻效果有明顯影響；在頂管糾偏施工過程中管體的最大壓應(yīng)力隨著糾偏壓力的增大而增大,因此在進(jìn)行糾偏施工時需要對糾偏壓力進(jìn)行合理的控制。為了確保沈陽地區(qū)頂管工程開挖面的安全穩(wěn)定,開挖面的支撐壓力20kPa以上來施加是偏于安全的。此時該工程的開挖面安全系數(shù)為1.39,開挖面偏于穩(wěn)定。
[Abstract]:In pipe jacking construction, in order to push the pipe smoothly in the soil, the jacking force needs to overcome the influence of all kinds of resistance and external factors (correction, back displacement), in order to reduce the friction resistance of the outer wall of the pipe when jacking, Thixotropic mud for friction reduction is injected between pipe joints and soil; therefore, The research on the control of the jacking force and the stability of the construction will have great engineering value for the pipe jacking engineering. This paper takes the large diameter pipe jacking project of the sand layer in Shenyang area as the engineering background. Numerical simulation combined with field monitoring is used to study. In Shenyang area, sand gravel (egg) soil is the main soil layer, and there is not much engineering experience that can be used for reference when jacking pipe with large diameter. Therefore, first of all, from the point of view of numerical simulation, In this paper, the method of estimating the required force in the process of jacking with initial force is put forward, and compared with the actual monitoring results, the thixotropic mud mixture ratio in the jacking of pipe jacking in Shenyang area is analyzed. The top force curves of 7 kinds of slurry are compared, and the stability of grouting construction and rectifying construction is analyzed. Finally, based on the calculation principle of strength reduction method, the safety factor of the excavated surface of pipe jacking engineering is obtained. The research results show that the numerical simulation method is used to predict the top force in the process of jacking pipe jacking. The optimum mass ratio of thixotropic mud bentonite and water in pipe jacking in Shenyang area is 1: 9, and the water consumption in thixotropic mud has obvious influence on drag reduction effect. In order to ensure the safety and stability of excavating surface of pipe jacking engineering in Shenyang area, the maximum compressive stress of pipe body increases with the increase of rectifying pressure during pipe jacking and rectifying construction, so it is necessary to carry out reasonable control of rectifying pressure in the process of rectifying deviation construction, in order to ensure the safety and stability of the excavated surface of pipe jacking engineering in Shenyang area. The safety factor of the excavated face is 1.39, and the excavating surface is stable.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU990.3

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