【摘要】：盾構(gòu)工法已廣泛應(yīng)用于城市地鐵及重大過江隧道的修建。然而,盾構(gòu)施工導(dǎo)致的地層損失、地表的變形沉降始終是困擾專家學(xué)者的重大難題。同步注漿是減小地層損失、控制地層應(yīng)力釋放和地層變形的重要手段,是盾構(gòu)施工的必備及關(guān)鍵工序。當(dāng)前關(guān)于盾構(gòu)隧道同步注漿的研究主要集中在數(shù)值模擬方面,對注漿參數(shù)的選取過分依賴于工程技術(shù)人員的個(gè)人經(jīng)驗(yàn),具有一定的局限性。對漿液在硬化的過程中的變形規(guī)律認(rèn)識也仍不明確。因此本文結(jié)合上海蘇州等軟土、復(fù)合地層盾構(gòu)隧道所采用的新型單液惰性漿液,進(jìn)行了室內(nèi)配比優(yōu)化實(shí)驗(yàn),在此基礎(chǔ)上還探究了攪拌時(shí)間、攪拌方式對漿液性能的影響;并且通過分析漿體的受力狀況研制了漿液收縮變形裝置,研究了新型單液惰性漿體在注漿壓力下的收縮變形規(guī)律。主要研究內(nèi)容如下:(1)借鑒上海蘇州等軟土、復(fù)合地層盾構(gòu)隧道所采用的新型單液惰性漿液配方,采取均勻試驗(yàn)的設(shè)計(jì)方法,進(jìn)行了同步注漿材料的配比優(yōu)化,為工程上采用合適的漿液配比提供科學(xué)的依據(jù)。并通過多元非線性回歸探討了漿液各組分對漿液某些施工性能的具體影響。(2)在研究漿液性能隨漿液組分變化規(guī)律的基礎(chǔ)上,以滿足強(qiáng)度要求R281.OMpa為前提采用MATLAB SQP優(yōu)化方法對新型單液惰性漿液進(jìn)行了配比優(yōu)化,結(jié)果如下:熟石灰120g、粉煤灰574.4g、膨潤土 203.4g、砂1015.3g、水684.7g、減水劑5g。(3)在優(yōu)化配比的基礎(chǔ)上研究攪拌時(shí)間、攪拌速度、攪拌桿類型對漿液各項(xiàng)性能的影響,高速(800r/min)攪拌相比于低速(200r/min)攪拌狀態(tài)時(shí)漿液稠度值增大10%左右、泌水率下降30%、28d抗壓強(qiáng)度值下降10%。(4)研制了漿體收縮變形實(shí)驗(yàn)裝置,比較系統(tǒng)地研究了漿液注入盾尾空隙后漿體的變形規(guī)律,探討了不同漿液類型、不同注漿壓力、不同地層基礎(chǔ)對漿體變形規(guī)律的影響。漿液體積收縮率隨著時(shí)間的增大而逐漸增大,相同注漿壓力下漿液的體積收縮率增長幅度成倍減小;相比于黏土土質(zhì),漿液在砂土土質(zhì)中體積收縮變形速率更快,且最終形變量較大。
[Abstract]:Shield method has been widely used in the construction of urban subway and major cross-river tunnel. However, the formation loss caused by shield tunneling and the deformation and settlement of the ground surface have always been a major problem for experts and scholars. Synchronous grouting is an important means to reduce formation loss and control formation stress release and formation deformation. It is also a necessary and key procedure in shield construction. At present, the research on synchronous grouting in shield tunnel is mainly focused on numerical simulation. The selection of grouting parameters depends too much on the personal experience of engineers and technicians, and has some limitations. The understanding of the deformation law of slurry during hardening is still unclear. In this paper, combined with the soft soil such as Shanghai and Suzhou, a new type of inert slurry with single liquid used in shield tunnel of composite stratum is carried out, and the effects of mixing time and mixing mode on the slurry performance are also discussed in this paper. Based on the analysis of the stress condition of the slurry, the shrinkage and deformation mechanism of the slurry is developed, and the shrinkage and deformation law of a new type of inert slurry under grouting pressure is studied. The main research contents are as follows: (1) by using the new formula of single liquid inert slurry used in shield tunnel of composite stratum for reference from soft soil such as Suzhou, Shanghai, and adopting the design method of uniform test, the proportioning of synchronous grouting material is optimized. It provides a scientific basis for the adoption of suitable slurry ratio in engineering. The effects of each component of the slurry on some construction properties of the slurry are discussed by multivariate nonlinear regression. (2) on the basis of the study of the variation law of the performance of the slurry with the composition of the slurry, The new inert slurry was optimized by MATLAB SQP method on the premise of meeting the strength requirement of R281.OMpa. The results are as follows: 120g of slaked lime, 574.4 g of fly ash, 203.4 g of bentonite, 1015.3 g of sand, 684.7 g of water. (3) the effects of mixing time, stirring speed and type of mixing rod on the properties of slurry were studied on the basis of optimizing the proportion of water reducer. Compared with the low speed (200r/min) stirring state, the consistency of the slurry increased by about 10%, the bleeding rate decreased by 30% and the compressive strength decreased by 10% at 28 days. (4) an experimental device for the shrinkage and deformation of the slurry was developed. The deformation law of slurry after slurry injection into shield cavities is studied systematically, and the effects of different slurry types, different grouting pressures and different strata foundation on slurry deformation are discussed. The volume shrinkage of the slurry increases with the increase of time, and the increase of volume shrinkage of the slurry decreases exponentially under the same grouting pressure. Compared with clay, the volume shrinkage and deformation rate of slurry in sandy soil is faster and the final deformation is larger.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U455.43

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