【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間,現(xiàn)在很多拱壩已經(jīng)進(jìn)入老齡化并出現(xiàn)了病險情況,尤其小型拱壩出現(xiàn)的病險情況尤為嚴(yán)重。近年來隨著病險拱壩數(shù)量的增多,現(xiàn)役拱壩的穩(wěn)定性以及安全性越來越引起大家的廣泛重視。本文利用有限元軟件ANSYS workbench針對某小型水庫不對稱拱壩在正常蓄水位、設(shè)計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,并對拱壩拱端推力對左端重力壩影響進(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)過對拱壩三種工況的模擬計算與分析,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)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV642.4

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