【摘要】：拱壩結(jié)構(gòu)應(yīng)力分析是拱壩設(shè)計(jì)的重要組成部分，，尤其是對(duì)規(guī)模龐大和技術(shù)難度高且超出已有設(shè)計(jì)規(guī)范的高拱壩。大量的工程經(jīng)驗(yàn)表明,拱壩最大主應(yīng)力常出現(xiàn)在壩肩和壩底處,特別是拉應(yīng)力過大會(huì)導(dǎo)致壩肩失穩(wěn)甚至潰壩等措施對(duì)壩體應(yīng)力的影響,給出了滿足拱壩規(guī)范設(shè)計(jì)要求的綜合加厚方案。本文介紹了國內(nèi)拱壩發(fā)展現(xiàn)狀提出了論文技術(shù)路線,首先利用ANSYS建立拱壩三維在限元計(jì)算模型，總結(jié)了拱壩有限元等效應(yīng)力法的計(jì)算和實(shí)現(xiàn)過程。介紹了靜水壓力、泥沙壓力、揚(yáng)壓力、重力、弧門推力等荷載施加方法,研究了已有高拱壩工程中拱壩壩體結(jié)構(gòu)設(shè)計(jì)中的加切角問題:分析了加切角對(duì)拱壩結(jié)構(gòu)應(yīng)力的影響,在2種工況下與不加切角方案作了應(yīng)力分析,結(jié)果表明:拱壩壩肩加切角措施能有效減小壩肩應(yīng)力。其次對(duì)拱壩壩底的3種不同加厚位置進(jìn)行研究，在不同工況下對(duì)比分析了壩底上游加厚、壩底下游加厚和壩底上、下游均加厚方案的應(yīng)力狀況,得出壩底下游加厚方案能有效減小壩底應(yīng)力;并對(duì)壩底下游加厚方案的加厚尺寸初步優(yōu)化,即分別對(duì)壩底下游加厚3m,6m、9m進(jìn)行應(yīng)力分析,計(jì)算結(jié)果表明:拱壩壩底向下游加厚6m,壩底處應(yīng)力值可滿足規(guī)范設(shè)計(jì)要求。最終提出了對(duì)壩肩、壩底均加厚的綜合方案,即:壩肩上游切角厚2m,壩肩下游切角厚2.8m,壩體501至510m高程向下游加厚6m。并計(jì)算了綜合方案下5種工況的拱壩壩體應(yīng)力,計(jì)算結(jié)果表明:采取綜合加厚方案,拱壩應(yīng)力標(biāo)準(zhǔn)可滿足拱壩規(guī)范設(shè)計(jì)要求。
[Abstract]:Stress analysis of arch dam structure is an important part of arch dam design, especially for high arch dam with large scale and high technical difficulty. A large number of engineering experiences have shown that the maximum principal stress of arch dam often occurs at the abutment and bottom of the dam, especially the influence of the measures such as instability of abutment and even dam break caused by excessive tensile stress on the stress of dam body. A comprehensive thickening scheme to meet the design requirements of arch dam code is presented. In this paper, the present situation of arch dam development in China is introduced and the technical route is put forward. Firstly, the 3D in-situ finite element calculation model of arch dam is established by using ANSYS, and the calculation and realization process of finite element equivalent force method for arch dam are summarized. This paper introduces the loading methods of hydrostatic pressure, sediment pressure, lifting pressure, gravity, arc gate thrust, etc., and studies the problem of adding shear angle in the structure design of arch dam in the existing high arch dam engineering. The influence of the shear angle on the structural stress of arch dam is analyzed, and the influence of shear angle on the stress of arch dam structure is analyzed. The stress analysis of the arch dam abutment and the non-cutting angle scheme is made under two conditions. The results show that the stress of the abutment of arch dam can be effectively reduced by adding the angle of the arch dam abutment. Secondly, three different thickening positions of arch dam bottom are studied, and the stress status of upstream thickening, downstream thickening of dam bottom and average thickening scheme of upper and lower reaches of dam bottom are compared and analyzed under different working conditions. It is concluded that the dam bottom stress can be effectively reduced by the thickening scheme at the downstream of the dam bottom. At the same time, the initial optimization of the thickening scheme of the downstream dam bottom is made, that is to say, the thickness of the downstream dam bottom is increased by 3m, 6m and 9m respectively. The calculated results show that the stress value at the bottom of the arch dam can meet the design requirements of the code when the bottom of the arch dam is thickened downstream by 6m. Finally, a comprehensive scheme is put forward to thicken the abutment and the bottom of the dam, that is, the thickness of the upstream cut angle of the dam abutment is 2m, the thickness of the downstream cut angle of the abutment is 2.8m, and the height of the dam body from 501 to 510m is thickened to the downstream of the dam body by 6 m. The stress of arch dam under five conditions under the comprehensive scheme is calculated. The results show that the stress standard of arch dam can meet the design requirements of arch dam code by adopting the scheme of comprehensive thickening.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV642.4

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本文編號(hào)：2440255