本文關(guān)鍵詞： 防波堤 軟土地基 固結(jié)模擬 穩(wěn)定分析 沉降　出處：《大連理工大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：防波堤是我國(guó)北方沿海地區(qū)常見(jiàn)的港口建筑物。修建在軟土地基上的斜坡式防波堤,其施工期的安全穩(wěn)定性尤為重要。在施工現(xiàn)場(chǎng)常常會(huì)遇到地基沉降不均勻,沉降速率過(guò)快的問(wèn)題,此時(shí)如何確定地基在不斷變形的情況下能否保持穩(wěn)定是需要研究的問(wèn)題。本文引入Biot固結(jié)理論,采用修正劍橋模型,借助大型非線性有限元軟件ABAQUS研究了大連長(zhǎng)興島葫蘆山灣南防波堤工程中的地基沉降問(wèn)題。通過(guò)對(duì)地基模型簡(jiǎn)化,模擬現(xiàn)場(chǎng)施工條件,求得了地基土體的沉降和水平位移,討論了各個(gè)施工階段的沉降特點(diǎn)及其影響因素,預(yù)測(cè)最終沉降量、工后沉降量和沉降引起的額外工程量。通過(guò)對(duì)比模擬,論證了應(yīng)用塑料排水板處理地基的必要性。結(jié)合不同工況的沉降規(guī)律曲線,討論了現(xiàn)有施工技術(shù)條件下工期安排的合理性。計(jì)算結(jié)果與實(shí)測(cè)值較為吻合。對(duì)于井群地基在2D模型中的簡(jiǎn)化方法的選取問(wèn)題,通過(guò)算例的比較分析,在井群地基簡(jiǎn)化為“砂墻”地基和簡(jiǎn)化為均質(zhì)地基這兩種情況下,沉降計(jì)算結(jié)果的差異是微小的。 根據(jù)固結(jié)模擬的計(jì)算結(jié)果,文中還應(yīng)用邊坡穩(wěn)定分析方法中的極限平衡法,借助巖土工程軟件GeoStudio對(duì)各施工階段邊坡的穩(wěn)定性進(jìn)行計(jì)算,重點(diǎn)討論了施工期地基土體強(qiáng)度指標(biāo)的選取,綜合分析了斜坡式防波堤施工期的安全性。 立足于施工單位和參建各方的角度,通過(guò)對(duì)斜坡式防波堤地基的固結(jié)變形分析和邊坡穩(wěn)定分析,得出：只有與施工實(shí)際相結(jié)合,綜合分析沉降模擬結(jié)果、監(jiān)測(cè)結(jié)果和安全系數(shù)才能有效的評(píng)價(jià)各施工階段加載方式的合理性,找出需重點(diǎn)監(jiān)測(cè)的施工階段,得出正確的穩(wěn)定性判斷,對(duì)施工才會(huì)有一定的指導(dǎo)意義。
[Abstract]:Breakwater is a common port building in the northern coastal area of China. The safety and stability of slope breakwater built on soft soil foundation is very important. How to determine whether the foundation can maintain stability under the condition of continuous deformation is a problem to be studied. Biot consolidation theory is introduced and modified Cambridge model is adopted in this paper. The settlement of the foundation in the south breakwater of Hulu Bay, Changxing Island, Dalian is studied by means of the large-scale nonlinear finite element software ABAQUS. The field construction conditions are simulated by simplifying the foundation model. The settlement and horizontal displacement of foundation soil are obtained, the settlement characteristics and influencing factors of each construction stage are discussed, the final settlement, the settlement after construction and the extra engineering amount caused by settlement are predicted. The necessity of using plastic drainage board to treat foundation and the curve of settlement law under different working conditions are demonstrated. This paper discusses the rationality of the time limit arrangement under the existing construction technology. The calculated results are in good agreement with the measured values. For the selection of simplified method for well group foundation in 2D model, the comparison and analysis of calculation examples are made. When the well group foundation is simplified into a "sand wall" foundation and a homogeneous foundation is simplified, the difference in settlement calculation results is small. According to the calculation results of consolidation simulation, the limit equilibrium method of slope stability analysis method and geotechnical engineering software GeoStudio are used to calculate the slope stability in each construction stage. The selection of soil strength index for foundation during construction period is discussed, and the safety of slope breakwater during construction is analyzed synthetically. Based on the analysis of consolidation deformation and slope stability of slope breakwater foundation from the angle of the construction unit and the parties involved in the construction, it is concluded that only combined with the construction practice, the settlement simulation results can be comprehensively analyzed. Only the monitoring result and safety factor can effectively evaluate the rationality of the loading mode in each construction stage, find out the construction stage that needs to be monitored, and get the correct stability judgment, which will have certain guiding significance to the construction.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U656.2

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