本文選題：高地溫　切入點(diǎn)：水工高壓隧洞　出處：《廣西大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：本文依托國(guó)家自然科學(xué)基金資助項(xiàng)目：高地溫梯度水工高壓隧洞THM耦合作用下的承載特性研究(項(xiàng)目編號(hào)：51369007),針對(duì)高地溫水工高壓隧洞結(jié)構(gòu)模型試驗(yàn)相似材料研究稀少的問(wèn)題,根據(jù)高地溫水工高壓隧洞的受力特征,運(yùn)用結(jié)構(gòu)模型試驗(yàn)的相似理論,進(jìn)行了結(jié)構(gòu)模型相似材料的研制。本文采用水泥、砂、碎石、重晶石粉等原材料,通過(guò)配比試驗(yàn),制備出一種熱穩(wěn)定性好、便于施工、力學(xué)性能參數(shù)穩(wěn)定且可調(diào)范圍廣的新型地質(zhì)力學(xué)模型相似材料,彌補(bǔ)了高地溫高壓水工隧洞模型相似材料研究的空缺。通過(guò)力學(xué)性能測(cè)試、熱線膨脹系數(shù)測(cè)試得到相似材料的物理參數(shù)數(shù)據(jù),分析得出原材料含量對(duì)試驗(yàn)測(cè)量的材料力學(xué)性能參數(shù)的影響規(guī)律,并將試驗(yàn)測(cè)量的相似材料物理參數(shù)賦值于結(jié)構(gòu)模型試驗(yàn)的數(shù)值仿真模型,進(jìn)行高地溫水工高壓隧洞模型的仿真模擬,分析了高地溫高壓水工隧洞模型的受力特征、破壞形態(tài),為結(jié)構(gòu)模型試驗(yàn)提供參考依據(jù)。本文主要研究成果如下：(1)組織了相似材料配比試驗(yàn),并進(jìn)行抗壓強(qiáng)度、抗拉強(qiáng)度、彈性模量了力學(xué)性能測(cè)試,與原型巖體物理參數(shù)進(jìn)行比較后,確定了兩組配比作為模型試驗(yàn)相似材料,分別符合模型試驗(yàn)Ⅱ類圍巖、Ⅲ類圍巖要求。通過(guò)綜合分析相似材料中不同含量的水泥、石子、重晶石粉、水膠比等與相似材料力學(xué)性能參數(shù)測(cè)試結(jié)果之間的關(guān)系,得到原材料含量不同對(duì)材料抗拉強(qiáng)度、抗壓強(qiáng)度、彈性模量的影響規(guī)律：相似材料的水泥含量、重晶石粉含量、石子含量的增大,以及水膠比的減小,都會(huì)導(dǎo)致抗拉強(qiáng)度、抗壓強(qiáng)度、彈性模量的增大。(2)通過(guò)進(jìn)行熱線膨脹系數(shù)的試驗(yàn),測(cè)得選定相似材料的熱膨脹系數(shù)符合一般巖石的熱線膨脹系數(shù)的取值范圍,滿足相似材料要求。(3)通過(guò)結(jié)構(gòu)模型試驗(yàn)?zāi)M得到以下仿真模擬結(jié)果：高地溫高壓水工隧洞結(jié)構(gòu)模型試驗(yàn),在充水時(shí),圍巖與隧洞中的水發(fā)生熱對(duì)流,產(chǎn)生溫度梯度,圍巖受溫度拉應(yīng)力作用明顯,圍巖承載能力比一般高壓水工隧洞模型低,溫度效應(yīng)不容忽視；高地溫高壓水工隧洞結(jié)構(gòu)模型受到溫度場(chǎng)、滲流場(chǎng)、應(yīng)力場(chǎng)的耦合作用,受力情況復(fù)雜,選擇T-H-M耦合模型進(jìn)行計(jì)算可能更加合理,在T-H-M耦合作用下,圍巖形成發(fā)散型裂縫并有少數(shù)裂縫深入發(fā)展,出現(xiàn)水力劈裂現(xiàn)象。
[Abstract]:In this paper, based on the project supported by National Natural Science Foundation: research on bearing characteristics of high geothermal gradient hydraulic and high pressure tunnel under THM coupling (Project No.: 51369007), the similar materials for structural model test of highland warm hydraulic tunnel are seldom studied. According to the stress characteristics of high temperature and high pressure tunnel and the similarity theory of structural model test, the similar material of structural model is developed. The raw materials such as cement, sand, crushed stone, barite powder and other raw materials are used in this paper. A new type of similar material with good thermal stability, easy construction, stable mechanical property parameters and wide adjustable range of geomechanical model was prepared, which made up for the lack of research on the similar material of high temperature and high pressure hydraulic tunnel model. The physical parameters of the similar materials were obtained by the thermal linear expansion coefficient test, and the influence of the content of raw materials on the mechanical properties of the materials measured in the experiment was analyzed. The physical parameters of similar materials measured in the experiment are assigned to the numerical simulation model of the structural model test, and the simulation simulation of the highland temperature and high pressure tunnel model is carried out, and the mechanical characteristics and failure patterns of the high temperature and high pressure hydraulic tunnel model are analyzed. The main research results of this paper are as follows: (1) the similar material ratio tests are organized, and the compressive strength, tensile strength and elastic modulus are tested, and compared with the physical parameters of the prototype rock mass. Two groups of similar materials are determined as model test materials, which meet the requirements of model test type 鈪，

本文編號(hào)：1604251