發(fā)布時(shí)間：2018-11-21 07:41

【摘要】：盾構(gòu)隧道對(duì)周圍環(huán)境的影響成為重要的研究課題,其中盾構(gòu)對(duì)周圍管線的影響問(wèn)題尤為突出。目前,針對(duì)盾構(gòu)隧道對(duì)周圍管線影響的研究還存在薄弱環(huán)節(jié),多數(shù)研究?jī)H考慮單一因素對(duì)管線變形的影響。本文針對(duì)影響管線位移的主要因素進(jìn)行敏感性分析,為實(shí)際工程的設(shè)計(jì)施工提供參考依據(jù)。運(yùn)用彈性地基梁理論,對(duì)隧道施工引起地層和管線變形機(jī)理進(jìn)行了探討;分析了剛性接口管線和柔性接口管線受隧道垂直下穿擾動(dòng)的力學(xué)效應(yīng),提出了管線變形與受力的預(yù)計(jì)方法。利用FLAC3D有限差分?jǐn)?shù)值模擬結(jié)合實(shí)測(cè)結(jié)果綜合分析了雙線隧道施工對(duì)管線和地表沉降的規(guī)律:左線隧道施工后,地表橫向沉降槽與管線位移曲線均符合高斯分布,管線與地表最大沉降均處于左線隧道中心正上方;右線隧道開(kāi)挖完成后,地表和管線的主要沉降范圍變大。地表的沉降特征近似符合高斯分布,沉降較左線隧道施工后增大,兩隧道中心沉降曲線較為平緩,最大沉降變至兩隧道之間;管線沉降呈現(xiàn)“一峰兩谷”形,不符合高斯分布,管線最大沉降值靠近左線隧道。數(shù)值模擬研究了六個(gè)主要因素對(duì)管線沉降的影響規(guī)律:隨著管線覆土深度、隧道掘進(jìn)速率和隧道直徑的增加,管線豎向位移和最大沉降逐漸變大;隨著管線直徑、開(kāi)挖面支護(hù)壓力比和管隧間距的增大,管線豎向位移和最大沉降逐漸減小;隨著隧道掘進(jìn)速率和隧道直徑的增加,管線的主要沉降范圍也有所增大。管線最大沉降量與覆土深度、開(kāi)挖面支護(hù)壓力比、隧道直徑近似呈線性關(guān)系。以管線最大沉降為指標(biāo),采用灰色關(guān)聯(lián)分析方法,對(duì)各因素的影響敏感性進(jìn)行了對(duì)比研究,以對(duì)管線沉降影響的敏感性由強(qiáng)到弱依次為:隧道直徑、管隧間距、管線直徑、管線覆土深度、開(kāi)挖面支護(hù)壓力比、隧道掘進(jìn)速率。
[Abstract]:The influence of shield tunneling on the surrounding environment has become an important research topic, in which the influence of shield tunneling on the surrounding pipeline is particularly prominent. At present, there is still a weak link in the study of the influence of shield tunnel on the surrounding pipeline, and most of the studies only consider the influence of a single factor on the pipeline deformation. In this paper, sensitivity analysis of the main factors affecting pipeline displacement is carried out, which provides a reference for the design and construction of practical engineering. Based on the theory of elastic foundation beam, the deformation mechanism of stratum and pipeline caused by tunnel construction is discussed. The mechanical effect of rigid interface pipeline and flexible interface pipeline subjected to vertical perturbing disturbance of tunnel is analyzed, and the prediction method of pipeline deformation and force is put forward. By using FLAC3D finite difference numerical simulation combined with the measured results, the law of pipeline and surface subsidence in two-line tunnel construction is comprehensively analyzed: after the construction of the left tunnel, the lateral settlement trough and the displacement curve of the pipeline conform to Gao Si's distribution. The maximum settlement of pipeline and surface is directly above the center of left tunnel. After the excavation of the right-line tunnel, the main settlement range of the surface and pipeline becomes larger. The settlement characteristics of the surface approximately accord with Gao Si distribution, the settlement is larger than that of the left tunnel, the center settlement curve of the two tunnels is relatively gentle, and the maximum settlement changes between the two tunnels. The settlement of pipeline is "one peak and two valleys", which does not accord with Gao Si distribution, and the maximum settlement value of pipeline is close to the left tunnel. The influence of six main factors on pipeline settlement is studied by numerical simulation. With the increase of tunnel tunneling speed and tunnel diameter, the vertical displacement and maximum settlement of pipeline become larger with the depth of overburden of pipeline, tunnel tunneling rate and tunnel diameter. The vertical displacement and maximum settlement of the pipeline gradually decrease with the increase of the diameter of pipeline, the pressure ratio of excavated surface support and the distance between pipes and tunnels, and the main settlement range of pipeline increases with the increase of tunneling speed and diameter. The maximum settlement of pipeline is linearly related to the depth of overlying soil, the ratio of support pressure to excavating surface, and the diameter of tunnel. Taking the maximum settlement of pipeline as the index and adopting the method of grey correlation analysis, the influence sensitivity of each factor is compared and studied. The order of sensitivity to the influence of pipeline settlement from strong to weak is: tunnel diameter, tunnel spacing, pipeline diameter, and so on. Pipeline overlying depth, excavating surface support pressure ratio, tunneling rate.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U455.43;TU990.3

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本文編號(hào)：2346339