發(fā)布時(shí)間：2018-08-13 16:14

【摘要】：拱壩是三面固接于巖基上的超靜定空間結(jié)構(gòu),其穩(wěn)定性和安全性主要依賴于壩體應(yīng)力的安全性以及壩肩的穩(wěn)定性。目前,我國(guó)大部分的拱壩都是在上世紀(jì)建造完成,距今也有幾十年的時(shí)間,現(xiàn)在很多拱壩已經(jīng)進(jìn)入老齡化并出現(xiàn)了病險(xiǎn)情況,尤其小型拱壩出現(xiàn)的病險(xiǎn)情況尤為嚴(yán)重。近年來(lái)隨著病險(xiǎn)拱壩數(shù)量的增多,現(xiàn)役拱壩的穩(wěn)定性以及安全性越來(lái)越引起大家的廣泛重視。本文利用有限元軟件ANSYS workbench針對(duì)某小型水庫(kù)不對(duì)稱拱壩在正常蓄水位、設(shè)計(jì)洪水位以及校核洪水位三種工況下的穩(wěn)定性和安全性進(jìn)行了數(shù)值模擬,并對(duì)拱壩拱端推力對(duì)左端重力壩影響進(jìn)行了分析,以確定該拱壩在穩(wěn)定性和安全性方面是否存在安全隱患。與普通拱壩穩(wěn)定性分析不同的是該拱壩的左、右兩肩受力條件不對(duì)稱,由于受不規(guī)則的“V”字形河谷斷面的限制,拱壩的右端直接與巖體連接,左端與重力壩連接。左端重力壩除受到自身重力、上游水壓力之外在壩體右側(cè)還要受到拱端推力,這使其與普通的重力壩有所不同。經(jīng)過(guò)對(duì)拱壩三種工況的模擬計(jì)算與分析,最終得出結(jié)果為:拱壩以及左端重力壩在三種工況下的最大變形只有9.5mm,屬于小變形;拱壩的最大拉應(yīng)力為1.3MPa,小于規(guī)范的容許值1.5 MPa,滿足強(qiáng)度要求;最大壓應(yīng)力都小于混凝土的容許抗壓值,滿足強(qiáng)度的要求;拱壩壩肩以及重力壩安全系數(shù)最小值均在2.7以上,滿足穩(wěn)定性要求。數(shù)值模擬結(jié)果顯示:該拱壩在使用多年后在強(qiáng)度方面、穩(wěn)定性和安全性方面滿足要求。
[Abstract]:Arch dam is a statically indeterminate space structure with three sides fixed on the rock foundation. Its stability and safety mainly depend on the security of dam body stress and the stability of dam abutment. At present, most of the arch dams in China were completed in the last century, and they have been built for several decades. Now many arch dams have been aging and have been in danger of illness, especially in the small arch dams. In recent years, with the increase of the number of dangerous arch dams, more and more attention has been paid to the stability and safety of active arch dams. In this paper, the finite element software ANSYS workbench is used to simulate the stability and safety of an asymmetric arch dam of a small reservoir under normal storage level, design flood water level and check flood water level. The influence of arch end thrust on the left end gravity dam is analyzed to determine whether the arch dam has a hidden safety hazard in terms of stability and safety. Different from the stability analysis of the common arch dam, the left and right shoulders of the arch dam are not symmetrical. Due to the limitation of the irregular "V" zigzag valley section, the right end of the arch dam is directly connected with the rock mass, and the left end is connected with the gravity dam. The gravity dam at the left end is not only subject to its own gravity, but also to the right side of the dam body in the upstream water pressure, which makes it different from the ordinary gravity dam. Through the simulation calculation and analysis of three working conditions of arch dam, the results are as follows: the maximum deformation of arch dam and left end gravity dam is only 9.5 mm, which belongs to small deformation; The maximum tensile stress of arch dam is 1.3 MPA, which is less than the allowable value of the code (1.5 MPA), which satisfies the strength requirement, the maximum compressive stress is less than the allowable compressive value of concrete and meets the requirement of strength, the minimum value of safety factor of arch dam abutment and gravity dam is above 2.7, Meet the stability requirements. The numerical simulation results show that the stability and safety of the arch dam meet the requirements of strength, stability and safety after many years of operation.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV642.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王仁坤;;我國(guó)特高拱壩的建設(shè)成就與技術(shù)發(fā)展綜述[J];水利水電科技進(jìn)展;2015年05期

2 梁建;劉銓鴻;張超;李榮;;基于ANSYS的混合線型拱壩等效應(yīng)力計(jì)算[J];人民長(zhǎng)江;2015年12期

3 李斌;李守義;沙玉霞;張曉飛;;基于等效應(yīng)力法的不同拱圈厚度拱壩承載力仿真分析[J];西北農(nóng)林科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年05期

4 王秋昕;李寶鋒;;淺析拱壩的周邊縫的處理[J];民營(yíng)科技;2012年10期

5 周建平;杜效鵠;;中國(guó)特高拱壩建設(shè)特點(diǎn)與關(guān)鍵技術(shù)問(wèn)題[J];水力發(fā)電;2012年08期

6 朱伯芳;;論混凝土拱壩有限元等效應(yīng)力[J];水利水電技術(shù);2012年04期

7 孫大為;蔡海勇;李華強(qiáng);張雷順;;長(zhǎng)嶺水庫(kù)拱壩加固前后三維有限元分析[J];人民黃河;2010年10期

8 劉曉樂(lè);徐培;;某小型砌石拱壩的結(jié)構(gòu)安全分析[J];廣東水利水電;2010年07期

9 陳知淵;;拱壩及其優(yōu)化方法的發(fā)展現(xiàn)狀與展望[J];水利與建筑工程學(xué)報(bào);2006年04期

10 吳佩佩;閆金良;;國(guó)內(nèi)拱壩的建設(shè)及發(fā)展[J];西北水電;2006年04期

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本文編號(hào)：2181510