【摘要】：沉管隧道施工期沉降、基礎(chǔ)層沉降的研究,是沉管隧道沉降研究的重要組成部分。更好的了解沉降特別是施工沉降的規(guī)律和特征,有助于提高施工質(zhì)量,保證運(yùn)營安全。本文主要通過實測數(shù)據(jù)分析、案例統(tǒng)計分析,對沉管隧道施工期沉降規(guī)律和施工影響展開研究,通過縮尺寸模型試驗,模擬水下環(huán)境和灌砂法施工工藝下基礎(chǔ)層的形成和壓縮,研究不同條件下的基礎(chǔ)層壓縮特性�；谘芯拷Y(jié)果總結(jié)沉降原因,提出控制沉降的可行建議。 本文主要結(jié)論和創(chuàng)新點如下： (1)施工期間沉降占總沉降的比例平均值為55.9%。施工期間管節(jié)縱向的沉降非常不均勻,工后沉降相對較連續(xù),施工期間的不均勻沉降在工后被放大。 (2)施工期間沉降隨時間變化有明顯折點,基礎(chǔ)層壓縮和下臥土層壓縮在完成時間上有差異,施工期間的不均勻沉降受施工工序和累計沉降影響。 (3)模擬工況下測得砂石基礎(chǔ)層平均壓縮模量為3.26MPa,施工過程中砂石的相互作用對整體壓縮模量產(chǎn)生約4.4倍的增幅,整體壓縮量與基礎(chǔ)層密實度有關(guān)。 (4)基槽內(nèi)回淤在壓縮中起類似潤滑劑的作用,能擴(kuò)大壓縮的不均勻性,僅少量回淤存在,影響就非常明顯,模擬工況中回淤條件下基礎(chǔ)層壓縮模量約為無回淤條件的0.6倍。
[Abstract]:The research on settlement of submersible tunnel and foundation layer is an important part of settlement study of immersed tunnel. A better understanding of the rules and characteristics of settlement, especially the settlement of construction, will help to improve the quality of construction and ensure the safety of operation. Through the analysis of measured data and statistical analysis of cases, this paper studies the settlement law and construction effect of immersed tunnel during construction period, and simulates the formation and compression of foundation layer under underwater environment and sand filling construction technology through the model test of shrinking size. The compression characteristics of foundation layer under different conditions are studied. Based on the research results, the causes of settlement are summarized, and some feasible suggestions for controlling settlement are put forward. The main conclusions and innovations of this paper are as follows: (1) the average value of the proportion of settlement to total settlement during construction is 55.9. The longitudinal settlement of pipe joints during construction is very uneven, and the settlement after construction is relatively continuous, and the uneven settlement during construction is amplified after construction. (2) during construction, the settlement varies obviously with time. There is a difference in the completion time between the foundation layer compression and the underlying soil compression. The uneven settlement during construction is affected by the construction procedure and the cumulative settlement. (3) the average compressive modulus of the sand and stone foundation is 3.26MPa, and the interaction of sand and stone increases the overall compression modulus by about 4.4 times. The integral compression amount is related to the compactness of the foundation layer. (4) the siltation in the base groove acts as a lubricant in the compression, which can enlarge the inhomogeneity of the compression. Only a small amount of desilting exists, and the effect is very obvious. The compression modulus of the foundation layer in the simulated condition is about 0.6 times as high as that in the non-silting condition.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U456.3;U459.5

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本文編號：2185443