【摘要】：碾壓混凝土(RCC)重力壩施工工藝簡單、造價較低、技術(shù)成熟，國內(nèi)外有無數(shù)的工程均采取了這種壩型。施工過程中溫度變化和徐變產(chǎn)生的應力對壩體的影響較大，故對壩體溫度場、應力場的分析十分必要。本文使用ANSYS有限元軟件中的參數(shù)化編程（簡稱APDL），針對上存碾壓混凝土(RCC)重力壩工程，對其溫度場、徐變應力場進行分析，提出溫度控制措施。根據(jù)提供的勘查設計等資料，驗證溫控措施的有效性，并得出指導工程實踐的措施。主要研究內(nèi)容如下： （1）介紹RCC重力壩溫控研究思路，以及溫度場、徐變應力場的計算原理，研究在仿真分析中如何實現(xiàn)徐變、邊界條件、本構(gòu)關(guān)系等的變化，根據(jù)實際工期安排、材料屬性、邊界條件及荷載等編寫APDL，分析熱應力耦合場，并通過生死單元技術(shù)模擬壩體澆筑過程。 （2）針對RCC重力壩中高溫期澆筑并埋設冷卻水管的部分，使用APDL編寫優(yōu)化程序，得出最優(yōu)的通水參數(shù)，澆筑薄層在環(huán)境月平均氣溫超過20℃時，進行通水冷卻，參考優(yōu)化通水參數(shù)并結(jié)合實際工程，選用通水流量15m3/d，水管間距0.75m*1.5m，通水溫差5℃，使得在滿足壩體溫度控制標準下更經(jīng)濟。當溫度超過25℃進入汛期，停止?jié)仓�。并提出智能冷卻水管模型，根據(jù)反饋動態(tài)調(diào)節(jié)通水參數(shù)，保證大體積混凝土的強度、節(jié)約成本。 （3）對壩體溫度場及徐變應力場進行仿真分析，結(jié)果表明：無溫控措施下的典型壩段施工期最高溫度達到41℃，超過工程溫度控制標準，故采取高溫長間歇和冷卻水管措施是必要的。采取相應溫控措施后的典型溢流壩段溫度場云圖、典型溢流壩段等值線圖及典型節(jié)點溫度歷時曲線中最高溫度均控制在標準之內(nèi)。采取相應溫控措施后的典型壩段徐變應力場增量云圖、典型節(jié)點徐變應力歷時曲線拉應力均不超過0.2Mpa，不超過各級配材料的允許拉應力。壩體整體的溫度場及徐變應力場分布與工程一般規(guī)律基本一致，并為壩體施工提供了一系列溫控措施。
[Abstract]:Roller compacted concrete (RCC) gravity dam has the advantages of simple construction technology, low cost and mature technology. Many projects at home and abroad have adopted this kind of dam type. During the construction process, the stress produced by temperature change and creep has great influence on the dam body, so it is necessary to analyze the temperature field and stress field of the dam body. In this paper, the temperature field and creep stress field of RCC (RCC) gravity dam project are analyzed by using parametric programming in ANSYS finite element software (APDL), for short), and the temperature control measures are put forward. According to the survey and design data provided, the effectiveness of temperature control measures is verified, and the measures to guide the engineering practice are obtained. The main research contents are as follows: (1) this paper introduces the research idea of temperature control of RCC gravity dam, as well as the calculation principle of temperature field and creep stress field, and studies how to realize the change of creep, boundary condition and constitutive relation in simulation analysis. According to the actual construction period, material properties, boundary conditions and loads, APDL, analysis of thermal stress coupling field is compiled, and the pouring process of dam body is simulated by life and death element technique. (2) aiming at the part of the RCC gravity dam pouring and burying the cooling pipe during the high temperature period, the optimization program is compiled by APDL, and the optimal water flow parameters are obtained. When the monthly average temperature of the environment is more than 20 鈩，

本文編號：2485846