水下隧道开裂混凝土渗透性研究
发布时间：2019-03-02 18:51
【摘要】：水下环境中隧道混凝土结构的耐久性和服役寿命受到严峻的挑战,隧道结构因开裂引起的渗水病害已成为影响水下隧道耐久性问题的第一要素。本文依托浙江省自然科学基金项目(LY17E08004),从水下隧道混凝土材料的性能出发,开展非饱和混凝土渗流特性的研究,通过试验,实现对水下隧道承受压力和混凝土裂缝的宽度、长度、深度等因素的定量控制,建立水下隧道开裂混凝土中物质传输模型,进行开裂混凝土中物质传输过程的理论分析、数值模拟分析,揭示水下开裂混凝土中水分渗流基本规律。本文的研究工作及得出的结论如下:1.基于混凝土的渗流基本理论公式出发,分析在水压力下完好和开裂混凝土中的水分运动情况,考虑完好和开裂混凝土中水分渗透的影响因素,以饱和度为变量,展开隧道外侧饱和与内侧非饱和状态的水分传输模型研究。2.基于沈家门隧道混凝土配合比,结合理论公式,设计渗透系数试验方案。试验结果表明:完好混凝土和开裂混凝土渗透系数与压力大小无关,只与自身的性质有关,但是开裂混凝土渗透系数还与裂缝宽度、裂缝长度、裂缝深度等因素有关,并验证测得开裂混凝土中的渗透系数符合立方定律。3.根据理论公式,设计合理的试验方案与装置。试验结果表明:完好和开裂混凝土渗透深度与水压力、饱和度和水灰比有关,但是开裂混凝土渗透深度还与裂缝宽度、裂缝长度以及裂缝深度有关;水压力大,完好和开裂混凝土水分运动就越快,渗透深度就越大;饱和度越大,完好和开裂混凝土水分运动就越慢,渗透深度就越小;水灰比大,完好和开裂混凝土水分运动就越快,渗透深度就越大;在同等条件下,裂缝宽度越大,开裂混凝土水分运动就越快,渗透深度就越大;在同等条件下,裂缝长度越大,开裂混凝土水分运动就越慢,渗透深度就越小;在同等条件下,裂缝深度越大,开裂混凝土水分运动就越快,渗透深度就越大。4.选用先进的多孔介质模拟软件PetraSim,展开完好和开裂混凝土试块建模仿真,分析水压力、混凝土初始饱和度、裂缝宽度、裂缝长度、裂缝深度等因素对水下完好和开裂混凝土裂缝处水分传输的影响。饱和度输出结果云图和输出数据结果分布图与试验数据进行对比,验证了模型的准确性、合理性以及真实性。同时结合第三章试验数据对沈家门海底隧道服役寿命进行预测,得出水下完好隧道的服役寿命和开裂隧道的服役寿命。
[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.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U457.2
本文编号：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.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U457.2
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