【摘要】：目前國內(nèi)水下盾構(gòu)隧道建設(shè)方興未艾,其施工環(huán)境效應(yīng)及結(jié)構(gòu)穩(wěn)定性的研究應(yīng)運(yùn)而生。本文研究在杭州水下盾構(gòu)隧道的建設(shè)背景下展開,依托于杭州慶春路過江隧道的工程實(shí)踐,通過現(xiàn)場試驗(yàn)和理論計算研究了盾構(gòu)掘進(jìn)引起的地面隆陷及錢塘江潮汐對隧道結(jié)構(gòu)受力性狀的影響,旨在深入認(rèn)識水下盾構(gòu)隧道施工環(huán)境擾動及其長期結(jié)構(gòu)性狀。 本文研究內(nèi)容總體上分為2部分,分別為盾構(gòu)掘進(jìn)引起的地面隆陷和錢塘江潮汐作用下盾構(gòu)隧道的受力性狀。 (一)盾構(gòu)掘進(jìn)引起的地面隆陷 慶春路隧道建設(shè)期間,對盾構(gòu)掘進(jìn)引起的地面隆陷進(jìn)行了大量的現(xiàn)場監(jiān)測,并實(shí)時記錄了盾構(gòu)掘進(jìn)參數(shù)。通過實(shí)測分析,總結(jié)了杭州軟土中盾構(gòu)掘進(jìn)引起地面豎向位移的特征和規(guī)律,并對各傳統(tǒng)地面沉降計算理論的適用性進(jìn)行評析。 在實(shí)測基礎(chǔ)之上,引入土力學(xué)和流體力學(xué)的若干基本理論計算盾構(gòu)掘進(jìn)引起的地面隆陷。主要創(chuàng)新點(diǎn)如下： (1)提出了盾構(gòu)非水平掘進(jìn)時的地面隆陷Mindlin解數(shù)值積分算法。 (2)在實(shí)測基礎(chǔ)之上發(fā)現(xiàn)橫向地面注漿隆起符合高斯分布,與地層損失沉降疊加,提出考慮注漿隆起效應(yīng)的廣義Peck公式。 (3)基于源匯法推導(dǎo)得到在隧道圍土不同收斂模式下的地面沉降計算公式,并在實(shí)測基礎(chǔ)之上進(jìn)行了經(jīng)驗(yàn)性改進(jìn),提供了一種盾構(gòu)隧道施工地層損失沉降估算的簡單可靠方法。 (4)提出了一種劃分地層損失沉降與固結(jié)沉降的簡單實(shí)用方法。 (5)提供了一種盾構(gòu)施工擾動超孔隙水壓力及地面固結(jié)沉降的理論計算方法。 (6)提出了一種考慮盾構(gòu)掘進(jìn)速度和停機(jī)時間的地面沉降計算理論。 (7)探討了同步注漿的時空效應(yīng),提出了考慮注漿效率和注漿分布模式的地面隆陷計算方法。 (8)提出了一種基于切口超挖控制的地面隆陷計算方法。 (二)錢塘江潮汐作用下盾構(gòu)隧道的受力性狀 慶春路隧道在建設(shè)期間設(shè)計實(shí)施了結(jié)構(gòu)健康監(jiān)測系統(tǒng),監(jiān)測項(xiàng)目包括隧道位置錢塘江水位、隧道圍壓、襯砌鋼筋應(yīng)變、襯砌水平直徑收斂以及隧道縱向沉降。依托于該健康監(jiān)測系統(tǒng)的現(xiàn)場實(shí)測,主要有以下創(chuàng)新性研究： (1)分析了錢塘江水下盾構(gòu)隧道圍壓及鋼筋應(yīng)變與水位的相關(guān)性。 (2)針對隧道上覆土層透水性的不同,提出了2種水下盾構(gòu)隧道襯砌設(shè)計模型,并以現(xiàn)場實(shí)測驗(yàn)證了其中之一的合理性。 (3)采用慣用計算法計算水位波動引起的襯砌鋼筋應(yīng)變變化,并根據(jù)現(xiàn)場實(shí)測數(shù)據(jù)對計算彎矩進(jìn)行了經(jīng)驗(yàn)性修正,使其計算內(nèi)力可用于襯砌結(jié)構(gòu)應(yīng)力應(yīng)變分析。 (4)基于上述兩種水下盾構(gòu)隧道襯砌設(shè)計模型,出于隧道結(jié)構(gòu)安全的考量,對錢塘江極限容許水位進(jìn)行了預(yù)測。
[Abstract]:At present, the construction of underwater shield tunnel is in the ascendant, and the study of its environmental effect and structural stability arises at the historic moment. In this paper, under the background of the construction of the underwater shield tunnel in Hangzhou, it is based on the engineering practice of crossing the river tunnel of Qingchun Road in Hangzhou. Based on field test and theoretical calculation, the influence of ground subsidence caused by shield tunneling and Qiantang River tide on the mechanical behavior of tunnel structure is studied in order to deeply understand the disturbance of underwater shield tunnel construction environment and its long-term structural characteristics. The research contents of this paper are divided into two parts, which are the mechanical behavior of shield tunnel caused by shield tunneling and tidal action of Qiantang River. (1) during the construction of Qingchun Road Tunnel caused by shield tunneling, a lot of on-site monitoring was carried out on the ground uplift caused by shield tunneling, and the parameters of shield tunneling were recorded in real time. The characteristics and laws of vertical ground displacement caused by shield tunneling in soft soil in Hangzhou are summarized through the actual measurement and analysis, and the applicability of the traditional land subsidence calculation theory is evaluated. Based on the measured results, some basic theories of soil mechanics and fluid mechanics are introduced to calculate the ground subsidence caused by shield tunneling. The main innovations are as follows: (1) the numerical integration algorithm for Mindlin solution of ground subsidence in shield tunneling is proposed. (2) based on the measured results, it is found that the transverse surface grouting uplift accords with Gao Si distribution and superimposes with formation loss and settlement. A generalized Peck formula considering grouting uplift effect is proposed. (3) based on the method of source and sink, the calculation formula of ground subsidence under different convergent modes of surrounding soil is derived, and the empirical improvement is made on the basis of actual measurement, which provides a simple and reliable method for estimating the ground loss settlement in shield tunnel construction. (4) A simple and practical method for distinguishing ground loss settlement from consolidation settlement is proposed. (5) A theoretical calculation method of disturbance excess pore water pressure and ground consolidation settlement in shield construction is provided. (6) A theory of land subsidence calculation considering shield tunneling speed and stopping time is proposed. (7) the space-time effect of synchronous grouting is discussed, and the calculation method of surface subsidence considering grouting efficiency and grouting distribution mode is proposed. (8) A calculation method of ground subsidence based on notch overdigging control is proposed. (2) the mechanical characteristics of shield tunnel under the action of Qiantang River Tide during the construction period of Qingchun Road Tunnel, a structural health monitoring system was designed and implemented. The monitoring items include the water level of Qiantang River, the tunnel confining pressure, and the strain of lining reinforcement. The horizontal diameter convergence of the lining and the longitudinal settlement of the tunnel. Based on the field measurements of the health monitoring system, the following innovative studies are carried out: (1) the correlation between the confining pressure and the reinforcement strain and the water level of the underwater shield tunnel in Qiantang River is analyzed. (2) two kinds of underwater shield tunnel lining design models are put forward in view of the different permeability of the overlying soil layer, and the rationality of one of them is verified by field measurement. (3) the strain change of lining steel bar caused by water level fluctuation is calculated by using the customary calculation method, and the calculated moment is modified empirically according to the measured data in the field, so that the calculated internal force can be used to analyze the stress and strain of lining structure. (4) based on the above two kinds of underwater shield tunnel lining design models and considering the tunnel structure safety, the limit allowable water level of Qiantang River is predicted.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：U455.43

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