【摘要】：海堤的安全穩(wěn)定關(guān)乎到其保護(hù)范圍內(nèi)的生命財(cái)產(chǎn)安全,為了掌握海堤工程的實(shí)時(shí)安全狀態(tài),建立科學(xué)有效的監(jiān)測(cè)模型具有重要意義。在眾多影響海堤安全穩(wěn)定的因素中,滲壓是評(píng)判海堤安全的重要指標(biāo)。海堤工程始終受到潮水位的作用,潮水位是影響滲壓分布的主要因素;同時(shí),海堤還經(jīng)常遭受降雨的作用,因此降雨是影響滲壓分布的重要因素。在潮水位和降雨的共同作用下,海堤堤身內(nèi)長(zhǎng)期處于飽和—非飽和非穩(wěn)定滲流狀態(tài),十分容易導(dǎo)致海堤的滲透破壞和岸坡失穩(wěn)。為及時(shí)掌握海堤滲流場(chǎng)分布,有效監(jiān)控、分析特殊工作環(huán)境下海堤的安全穩(wěn)定,本文首先在分析、總結(jié)前人研究的基礎(chǔ)上,提出了一種形式簡(jiǎn)單、精度較好的降雨入滲模式。其次,利用ANSYS熱分析模塊,以潮水位和降雨分別作為水頭邊界條件和流量邊界條件,模擬計(jì)算海堤滲流場(chǎng)分布。利用ANSYS參數(shù)化設(shè)計(jì)語(yǔ)言編寫(xiě)海堤非穩(wěn)定滲流場(chǎng)分析程序,分析過(guò)程中,根據(jù)前次有限元迭代計(jì)算結(jié)果調(diào)整自由面、溢出點(diǎn),并由基質(zhì)吸力修正非飽和區(qū)滲透系數(shù)。再次,分別進(jìn)行了不考慮研究時(shí)段內(nèi)降雨入滲時(shí)滲壓計(jì)算、考慮潮水位和降雨共同作用下海堤滲流場(chǎng)的模擬分析,結(jié)果顯示:采用本文所述的降雨入滲模式時(shí),有限元計(jì)算結(jié)果與實(shí)測(cè)數(shù)據(jù)吻合度良好。此外,在進(jìn)行海堤非穩(wěn)定滲流場(chǎng)分析過(guò)程中發(fā)現(xiàn),當(dāng)采用不同時(shí)期的潮水位時(shí),模擬滲流場(chǎng)逼近真實(shí)滲流場(chǎng)的速度差異較為明顯,因此,本文也對(duì)四類(lèi)不同時(shí)期的初始潮水位對(duì)模擬滲流場(chǎng)逼近真實(shí)滲流場(chǎng)的速度進(jìn)行了分析研究。最后,根據(jù)監(jiān)測(cè)點(diǎn)處滲壓有限元計(jì)算,提取相應(yīng)的水頭滲壓分量有限元結(jié)果和降雨滲壓分量有限元結(jié)果,以前期潮水位的冪函數(shù)作為水頭滲壓分量的結(jié)構(gòu)形式,以多段前期降雨量和作為降雨滲壓分量的結(jié)構(gòu)形式,再分別計(jì)算兩個(gè)分量表達(dá)式的各個(gè)參數(shù),將水頭滲壓分量和降雨滲壓分量調(diào)整系數(shù),同時(shí)效分量一起進(jìn)行參數(shù)估計(jì),從而建立起滲壓確定性模型,為可靠預(yù)報(bào)海堤安全狀態(tài)提供參考。
[Abstract]:The safety and stability of the seawall is related to the safety of life and property within the scope of its protection. In order to grasp the real-time safety state of the seawall project, it is of great significance to establish a scientific and effective monitoring model. Among the factors influencing the safety and stability of seawall, seepage pressure is an important index to evaluate the safety of seawall. The seawall works are always affected by the tidal level, which is the main factor affecting the distribution of osmotic pressure, and at the same time, the seawall is often affected by rainfall, so rainfall is an important factor affecting the distribution of osmotic pressure. Under the combined action of tidal level and rainfall, the embankment is in a saturated-unsaturated unsteady seepage state for a long time, which can easily lead to seepage failure and bank slope instability of the seawall. In order to grasp the seepage field distribution of seawall, monitor effectively and analyze the safety and stability of seawall under special working environment, this paper firstly puts forward a rainfall infiltration model with simple form and good precision on the basis of analyzing and summarizing the previous research. Secondly, the ANSYS thermal analysis module is used to simulate and calculate the seepage field distribution of seawall with tidal level and rainfall as head boundary condition and discharge boundary condition respectively. The analysis program of unsteady seepage field of seawall is compiled by ANSYS parametric design language. In the process of analysis, the free surface and overflow point are adjusted according to the results of the previous finite element iteration, and the permeability coefficient of unsaturated zone is modified by matrix suction. Thirdly, the seepage field of seawall under the influence of tide level and rainfall is simulated and analyzed separately without considering the rainfall infiltration in the study period. The results show that: when the rainfall infiltration model described in this paper is adopted, the seepage field of seawall is simulated and analyzed. The results of finite element method are in good agreement with the measured data. In addition, during the analysis of the unsteady seepage field of the seawall, it is found that the velocity difference between the simulated seepage field and the real seepage field is obvious when the tide level is used in different periods. In this paper, the velocity of the simulated seepage field approaching to the real seepage field by the initial tidal level in four different periods is also analyzed and studied. Finally, according to the finite element calculation of the seepage pressure at the monitoring point, the corresponding finite element results of the seepage pressure component of the head and the finite element result of the seepage pressure component of the rainfall are extracted, and the power function of the pre-tide level is taken as the structural form of the seepage pressure component of the water head. Based on the structural form of rainfall in the early stage and as the component of rainfall osmotic pressure, the parameters of the expression of the two components are calculated, and the adjustment coefficients of the water head component and the rainfall osmotic component are adjusted, and the parameters are estimated together with the effect component. Thus, the deterministic model of seawall pressure is established, which provides a reference for reliable prediction of seawall safety state.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U656.314

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 ;ADAPTIVE FEM ANALYSIS FOR TWO-DIMENSIONAL UNCONFINED SEEPAGE PROBLEMS[J];Journal of Hydrodynamics(Ser.B);1996年01期

2 吳中如,顧沖時(shí),沈振中,趙斌,吳相豪;大壩安全綜合分析和評(píng)價(jià)的理論、方法及其應(yīng)用[J];水利水電科技進(jìn)展;1998年03期

3 張進(jìn)平,莊萬(wàn)康;大壩安全監(jiān)測(cè)的位移分布數(shù)學(xué)模型[J];水利學(xué)報(bào);1991年05期

4 吳夢(mèng)喜,高蓮士;飽和 非飽和土體非穩(wěn)定滲流數(shù)值分析[J];水利學(xué)報(bào);1999年12期

5 顧沖時(shí),吳中如,徐志英;用突變理論分析大壩及巖基穩(wěn)定性的探討[J];水利學(xué)報(bào);1998年09期

6 佘穎禾，孫鷹，郭小明;FREE BOUNDARY PROBLEM OF THE 2D SEEPAGE FLOW　[J];Applied Mathematics and Mechanics(English Edition);1996年06期

7 王金桃，王浣塵;海塘工程安全分析與防臺(tái)抗潮決策支持技術(shù)[J];災(zāi)害學(xué);1994年03期

8 朱岳明,龔道勇;三維飽和非飽和滲流場(chǎng)求解及其逸出面邊界條件處理[J];水科學(xué)進(jìn)展;2003年01期

9 趙永宣;應(yīng)用ANSYS軟件進(jìn)行大壩動(dòng)力計(jì)算抗震分析[J];水力發(fā)電;2000年12期

10 柳厚祥,李寧,廖雪,龔錦林,方鳳華;考慮應(yīng)力場(chǎng)與滲流場(chǎng)耦合的尾礦壩非穩(wěn)定滲流分析[J];巖石力學(xué)與工程學(xué)報(bào);2004年17期

相關(guān)博士學(xué)位論文 前2條

1 王小敏;基于有限元方法的大壩變形分析與仿真研究[D];武漢大學(xué);2010年

2 賈蒼琴;考慮非飽和非穩(wěn)定滲流和剪脹性的土坡穩(wěn)定分析[D];同濟(jì)大學(xué);2006年

相關(guān)碩士學(xué)位論文 前9條

1 陸迎壽;基于監(jiān)測(cè)資料的海堤非穩(wěn)定滲流反演研究[D];合肥工業(yè)大學(xué);2015年

2 周樂(lè);土石壩的滲流特性分析及數(shù)值模擬[D];大連理工大學(xué);2014年

3 吳正中;海塘工程安全評(píng)價(jià)研究[D];浙江工業(yè)大學(xué);2014年

4 劉亞麗;低溢流重力壩斷面拓?fù)鋬?yōu)化[D];西北農(nóng)林科技大學(xué);2013年

5 吳誠(chéng)高;基于ANSYS的樂(lè)化水庫(kù)滲流場(chǎng)與應(yīng)力場(chǎng)的耦合分析研究[D];南昌大學(xué);2010年

6 王增欣;土石壩飽和—非飽和滲流的有限元分析及應(yīng)用[D];大連理工大學(xué);2010年

7 馮天琪;天津津塔大體積混凝土底板溫度場(chǎng)測(cè)試和仿真模擬[D];天津大學(xué);2009年

8 岳慶河;基于ANSYS的土石壩滲流與穩(wěn)定分析研究[D];山東農(nóng)業(yè)大學(xué);2008年

9 李維維;用ANSYS作考慮滲透壓的邊坡穩(wěn)定分析[D];貴州大學(xué);2006年

，

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