水下隧道開裂混凝土滲透性研究
發(fā)布時(shí)間：2019-03-02 18:51
【摘要】：水下環(huán)境中隧道混凝土結(jié)構(gòu)的耐久性和服役壽命受到嚴(yán)峻的挑戰(zhàn),隧道結(jié)構(gòu)因開裂引起的滲水病害已成為影響水下隧道耐久性問題的第一要素。本文依托浙江省自然科學(xué)基金項(xiàng)目(LY17E08004),從水下隧道混凝土材料的性能出發(fā),開展非飽和混凝土滲流特性的研究,通過試驗(yàn),實(shí)現(xiàn)對(duì)水下隧道承受壓力和混凝土裂縫的寬度、長(zhǎng)度、深度等因素的定量控制,建立水下隧道開裂混凝土中物質(zhì)傳輸模型,進(jìn)行開裂混凝土中物質(zhì)傳輸過程的理論分析、數(shù)值模擬分析,揭示水下開裂混凝土中水分滲流基本規(guī)律。本文的研究工作及得出的結(jié)論如下:1.基于混凝土的滲流基本理論公式出發(fā),分析在水壓力下完好和開裂混凝土中的水分運(yùn)動(dòng)情況,考慮完好和開裂混凝土中水分滲透的影響因素,以飽和度為變量,展開隧道外側(cè)飽和與內(nèi)側(cè)非飽和狀態(tài)的水分傳輸模型研究。2.基于沈家門隧道混凝土配合比,結(jié)合理論公式,設(shè)計(jì)滲透系數(shù)試驗(yàn)方案。試驗(yàn)結(jié)果表明:完好混凝土和開裂混凝土滲透系數(shù)與壓力大小無關(guān),只與自身的性質(zhì)有關(guān),但是開裂混凝土滲透系數(shù)還與裂縫寬度、裂縫長(zhǎng)度、裂縫深度等因素有關(guān),并驗(yàn)證測(cè)得開裂混凝土中的滲透系數(shù)符合立方定律。3.根據(jù)理論公式,設(shè)計(jì)合理的試驗(yàn)方案與裝置。試驗(yàn)結(jié)果表明:完好和開裂混凝土滲透深度與水壓力、飽和度和水灰比有關(guān),但是開裂混凝土滲透深度還與裂縫寬度、裂縫長(zhǎng)度以及裂縫深度有關(guān);水壓力大,完好和開裂混凝土水分運(yùn)動(dòng)就越快,滲透深度就越大;飽和度越大,完好和開裂混凝土水分運(yùn)動(dòng)就越慢,滲透深度就越小;水灰比大,完好和開裂混凝土水分運(yùn)動(dòng)就越快,滲透深度就越大;在同等條件下,裂縫寬度越大,開裂混凝土水分運(yùn)動(dòng)就越快,滲透深度就越大;在同等條件下,裂縫長(zhǎng)度越大,開裂混凝土水分運(yùn)動(dòng)就越慢,滲透深度就越小;在同等條件下,裂縫深度越大,開裂混凝土水分運(yùn)動(dòng)就越快,滲透深度就越大。4.選用先進(jìn)的多孔介質(zhì)模擬軟件PetraSim,展開完好和開裂混凝土試塊建模仿真,分析水壓力、混凝土初始飽和度、裂縫寬度、裂縫長(zhǎng)度、裂縫深度等因素對(duì)水下完好和開裂混凝土裂縫處水分傳輸?shù)挠绊�。飽和度輸出結(jié)果云圖和輸出數(shù)據(jù)結(jié)果分布圖與試驗(yàn)數(shù)據(jù)進(jìn)行對(duì)比,驗(yàn)證了模型的準(zhǔn)確性、合理性以及真實(shí)性。同時(shí)結(jié)合第三章試驗(yàn)數(shù)據(jù)對(duì)沈家門海底隧道服役壽命進(jìn)行預(yù)測(cè),得出水下完好隧道的服役壽命和開裂隧道的服役壽命。
[Abstract]:The durability and service life of tunnel concrete structure in underwater environment are seriously challenged. The seepage disease caused by cracking of tunnel structure has become the first factor affecting the durability of underwater tunnel. Based on the Zhejiang Natural Science Foundation Project (LY17E08004), this paper studies the seepage characteristics of unsaturated concrete based on the performance of concrete materials in underwater tunnels. Through experiments, the underwater tunnel is subjected to pressure and the width of concrete cracks. Based on the quantitative control of the length and depth, the material transfer model in the cracked concrete of underwater tunnel is established, and the theoretical analysis and numerical simulation analysis of the material transfer process in the cracked concrete are carried out. The basic law of water seepage in underwater cracked concrete is revealed. The research work and conclusions of this paper are as follows: 1. Based on the basic theoretical formula of seepage flow in concrete, the movement of water in intact and cracked concrete under water pressure is analyzed. The influence factors of moisture permeability in intact and cracked concrete are considered, and the saturation is taken as variable. Study on the Model of Water Transport in saturated and inside unsaturated conditions on the outside of the unfolded Tunnel. 2. Based on the concrete mix ratio of Shenjiamen tunnel, combined with the theoretical formula, the permeability coefficient test scheme is designed. The experimental results show that the permeability coefficients of intact concrete and cracked concrete are independent of the pressure, but only related to their own properties, but the permeability coefficients of cracked concrete are also related to crack width, crack length, crack depth and other factors, and the permeability coefficient of cracked concrete is related to crack width, crack length and crack depth. And it is verified that the permeability coefficient in cracked concrete conforms to cubic law. 3. According to the theoretical formula, a reasonable test scheme and device are designed. The experimental results show that the permeability depth of intact and cracked concrete is related to water pressure, saturation and water-cement ratio, but the permeability depth of cracked concrete is also related to crack width, crack length and crack depth. The higher the water pressure, the faster the moisture movement of the intact and cracked concrete, and the greater the penetration depth, the slower the moisture movement of the intact and cracked concrete is, and the smaller the penetration depth is, the higher the saturation, the slower the moisture movement of the intact and cracked concrete. The greater the water-cement ratio, the faster the moisture movement and the penetration depth of the intact and cracked concrete, and under the same conditions, the larger the crack width, the faster the moisture movement of the cracked concrete and the greater the penetration depth; Under the same conditions, the larger the crack length, the slower the moisture movement of the cracked concrete and the smaller the penetration depth; under the same conditions, the greater the crack depth, the faster the moisture movement of the cracked concrete, and the greater the penetration depth. 4. The advanced porous media simulation software PetraSim, is used to model and simulate intact and cracked concrete blocks. The water pressure, initial saturation of concrete, crack width and crack length are analyzed. Effects of crack depth and other factors on water transfer in underwater intact and cracked concrete cracks. The accuracy, rationality and authenticity of the model are verified by comparing the saturation output cloud map and the output data distribution map with the experimental data. At the same time, combined with the test data in chapter 3, the service life of Shenjiamen subsea tunnel is predicted, and the service life of underwater intact tunnel and cracked tunnel is obtained.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U457.2
本文編號(hào)：2433360
[Abstract]:The durability and service life of tunnel concrete structure in underwater environment are seriously challenged. The seepage disease caused by cracking of tunnel structure has become the first factor affecting the durability of underwater tunnel. Based on the Zhejiang Natural Science Foundation Project (LY17E08004), this paper studies the seepage characteristics of unsaturated concrete based on the performance of concrete materials in underwater tunnels. Through experiments, the underwater tunnel is subjected to pressure and the width of concrete cracks. Based on the quantitative control of the length and depth, the material transfer model in the cracked concrete of underwater tunnel is established, and the theoretical analysis and numerical simulation analysis of the material transfer process in the cracked concrete are carried out. The basic law of water seepage in underwater cracked concrete is revealed. The research work and conclusions of this paper are as follows: 1. Based on the basic theoretical formula of seepage flow in concrete, the movement of water in intact and cracked concrete under water pressure is analyzed. The influence factors of moisture permeability in intact and cracked concrete are considered, and the saturation is taken as variable. Study on the Model of Water Transport in saturated and inside unsaturated conditions on the outside of the unfolded Tunnel. 2. Based on the concrete mix ratio of Shenjiamen tunnel, combined with the theoretical formula, the permeability coefficient test scheme is designed. The experimental results show that the permeability coefficients of intact concrete and cracked concrete are independent of the pressure, but only related to their own properties, but the permeability coefficients of cracked concrete are also related to crack width, crack length, crack depth and other factors, and the permeability coefficient of cracked concrete is related to crack width, crack length and crack depth. And it is verified that the permeability coefficient in cracked concrete conforms to cubic law. 3. According to the theoretical formula, a reasonable test scheme and device are designed. The experimental results show that the permeability depth of intact and cracked concrete is related to water pressure, saturation and water-cement ratio, but the permeability depth of cracked concrete is also related to crack width, crack length and crack depth. The higher the water pressure, the faster the moisture movement of the intact and cracked concrete, and the greater the penetration depth, the slower the moisture movement of the intact and cracked concrete is, and the smaller the penetration depth is, the higher the saturation, the slower the moisture movement of the intact and cracked concrete. The greater the water-cement ratio, the faster the moisture movement and the penetration depth of the intact and cracked concrete, and under the same conditions, the larger the crack width, the faster the moisture movement of the cracked concrete and the greater the penetration depth; Under the same conditions, the larger the crack length, the slower the moisture movement of the cracked concrete and the smaller the penetration depth; under the same conditions, the greater the crack depth, the faster the moisture movement of the cracked concrete, and the greater the penetration depth. 4. The advanced porous media simulation software PetraSim, is used to model and simulate intact and cracked concrete blocks. The water pressure, initial saturation of concrete, crack width and crack length are analyzed. Effects of crack depth and other factors on water transfer in underwater intact and cracked concrete cracks. The accuracy, rationality and authenticity of the model are verified by comparing the saturation output cloud map and the output data distribution map with the experimental data. At the same time, combined with the test data in chapter 3, the service life of Shenjiamen subsea tunnel is predicted, and the service life of underwater intact tunnel and cracked tunnel is obtained.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U457.2
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