本文選題：層狀巖體　切入點(diǎn)：力學(xué)參數(shù)　出處：《長(zhǎng)沙理工大學(xué)》2013年碩士論文

【摘要】：如何合理確定巖體力學(xué)參數(shù)一直是巖體力學(xué)領(lǐng)域及工程建設(shè)中的重要研究課題。巖體力學(xué)參數(shù)的取值不僅與完整巖塊的材料性質(zhì)有關(guān)，還與工程巖體所處的狀態(tài)緊密相聯(lián)。本文在巖體力學(xué)參數(shù)數(shù)值試驗(yàn)?zāi)Ｐ捅孀R(shí)的基礎(chǔ)上，通過大量巖體數(shù)值試驗(yàn)，研究了巖體結(jié)構(gòu)特征、應(yīng)力狀態(tài)、孔隙水壓力等因素對(duì)層狀巖體變形模量、抗剪斷強(qiáng)度參數(shù)的影響。論文的主要研究工作及成果如下： 1）回顧了巖體力學(xué)參數(shù)的確定方法及狀態(tài)相關(guān)性研究的國(guó)內(nèi)外現(xiàn)狀，總結(jié)和分析了影響巖體力學(xué)參數(shù)的狀態(tài)因素和研究方法，提出了采用數(shù)值仿真手段研究巖體結(jié)構(gòu)形態(tài)特征、應(yīng)力狀態(tài)、孔隙水壓力等因素對(duì)層狀巖體力學(xué)參數(shù)取值的影響。在此基礎(chǔ)上，以淋溪河水電站壩址區(qū)部分巖體剛性承壓板試驗(yàn)和現(xiàn)場(chǎng)直剪試驗(yàn)結(jié)果為依據(jù)，運(yùn)用計(jì)算機(jī)模擬技術(shù)對(duì)其進(jìn)行數(shù)值仿真試驗(yàn)，通過物理試驗(yàn)和數(shù)值試驗(yàn)結(jié)果的對(duì)比分析，說明了以上兩種巖體力學(xué)試驗(yàn)的模擬方法是可行的。 2）基于大量剛性承壓板數(shù)值試驗(yàn)和現(xiàn)場(chǎng)直剪數(shù)值試驗(yàn)，研究了巖體結(jié)構(gòu)特征對(duì)層狀巖體力學(xué)參數(shù)的影響規(guī)律。通過對(duì)承壓板數(shù)值試驗(yàn)中各類巖體鉛直位移等值線的分布及試驗(yàn)結(jié)果進(jìn)行分析發(fā)現(xiàn)，層狀巖體變形特征具有明顯的結(jié)構(gòu)效應(yīng)，結(jié)構(gòu)面傾角、間距、剛度對(duì)巖體變形模量的影響是相互影響的。同時(shí)，為進(jìn)一步探究結(jié)構(gòu)特征對(duì)層狀巖體變形模量的影響，采用解析法對(duì)同類層狀巖體的變形模量進(jìn)行了研究，得到的成果與數(shù)值試驗(yàn)法基本相同。通過模擬結(jié)構(gòu)面產(chǎn)狀不同的層狀巖體現(xiàn)場(chǎng)直剪試驗(yàn)，采用莫爾-庫(kù)倫準(zhǔn)則對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行整理，探究了層狀巖體抗剪斷強(qiáng)度參數(shù)的結(jié)構(gòu)面產(chǎn)狀效應(yīng)。 3）通過模擬不同初始應(yīng)力大小下的層狀巖體現(xiàn)場(chǎng)承壓板試驗(yàn)，探討了初始應(yīng)力對(duì)層狀巖體變形模量的影響。在側(cè)壓力系數(shù)為0.5的應(yīng)力環(huán)境下，層狀巖體變形模量會(huì)隨著初始應(yīng)力的增加而變大，但當(dāng)初始應(yīng)力增至某一特定值時(shí)，層狀巖體變形模量的變化特征會(huì)因結(jié)構(gòu)面傾角的不同而出現(xiàn)較大差異。通過模擬初始應(yīng)力水平不同的層狀巖體現(xiàn)場(chǎng)直剪數(shù)值試驗(yàn)，研究了初始應(yīng)力大小對(duì)層狀巖體抗剪斷強(qiáng)度參數(shù)的影響。在側(cè)壓力系數(shù)為0.5的應(yīng)力環(huán)境下，隨著初始應(yīng)力的增大，除傾角0°的層狀巖體抗剪斷強(qiáng)度參數(shù)保持不變外，其他傾角層狀巖體粘聚力呈線性增加但內(nèi)摩擦角基本保持不變�；谕悓訝顜r體的現(xiàn)場(chǎng)直剪、室內(nèi)直剪、三軸壓縮等數(shù)值試驗(yàn)結(jié)果，闡明了巖體加載狀態(tài)對(duì)層狀巖體抗剪斷強(qiáng)度參數(shù)的影響。由于同類巖體在不同試驗(yàn)方法中的加載狀態(tài)及變形破壞機(jī)制均不同，其所得抗剪斷強(qiáng)度參數(shù)值存在較大差異。 4）通過模擬含不同孔隙水壓力的層狀巖體現(xiàn)場(chǎng)承壓板試驗(yàn)和現(xiàn)場(chǎng)直剪試驗(yàn)，探究了孔隙水壓力對(duì)層狀巖體力學(xué)參數(shù)的影響規(guī)律。研究成果表明：層狀巖體變形模量隨孔隙水壓力的增加而變大，，但變化特征因結(jié)構(gòu)面傾角不同而不同；隨著孔隙水壓力的增加，層狀巖體的粘聚力呈線性減小，內(nèi)摩擦角基本不變。 5）基于不同狀態(tài)下層狀巖體數(shù)值試驗(yàn)研究成果，建立了應(yīng)用參考狀態(tài)巖體力學(xué)參數(shù)和狀態(tài)影響因子求解不同狀態(tài)下的層狀巖體力學(xué)參數(shù)的函數(shù)關(guān)系表達(dá)式。
[Abstract]:How to determine the mechanical parameters of rock mass has been an important research topic in the field of rock mechanics and engineering construction. The values of mechanical parameters of rock mass is not only related to the material properties of intact rock, which is closely related to the state of rock mass and engineering. In this paper, the mechanical parameters of rock mass numerical test model identification, through a large number of numerical tests of rock mass and study the characteristics of rock mass structures, stress, pore water pressure and other factors on the influence of deformation modulus, shear strength parameters. The main research work and achievements of the thesis are as follows:
1) correlation method and research status at home and abroad were reviewed to determine the mechanical parameters of rock mass, summarizes and analyzes the status of affect factors and research methods of rock mechanics parameters, puts forward the research of rock mass structure characteristics by means of numerical simulation, the stress state, the effect of pore water pressure and other factors on the mechanical parameters of layered rock mass. On this basis, the rigid bearing plate rock part of Linxi River Hydropower Station dam site test and in-situ direct shear test results as the basis, using computer simulation technology to carry out the numerical simulation test, through comparative analysis of physical experiment and numerical experiment results, the simulation method of the above two kinds of rock mechanics test is feasible.
2) a large number of numerical direct shear tests of rigid bearing plate numerical test and field based on the influence of rock mass structure on the mechanical parameters of layered rock mass. According to the analysis of the distribution and the test results of the numerical experiments of rock bearing plate vertical displacement contour, the deformation characteristics of layered rock mass structure has obvious effect, surface structure angle, distance, influence of stiffness on the deformation modulus of rock is the mutual influence. At the same time, to further explore the influence of structure deformation modulus of layered rock mass, the analytical method of similar layered rock mass deformation modulus was studied, and results of numerical experiments were basically the same. Through field simulation of layered rock structure surface the shape of different direct shear test, using Mohr criterion of Kulun test data, structural plane effect on shear strength parameters of layered rock mass Should be.
3) through the simulation of different initial stress field of layered rock mass stress under bearing plate test, discusses the influence of initial stress on deformation modulus. The lateral pressure coefficient is 0.5 under environmental stress, modulus will increase with initial stress and large deformation of layered rock mass, but when the initial stress increased a specific value, variation of deformation modulus of layered rock mass due to obliquity is different and larger difference. By simulating the initial stress field of layered rock mass numerical direct shear tests on different force levels, studied the effects of initial stress on rock shear strength parameters. The lateral pressure coefficient should be 0.5, with the increase of the initial stress, in addition to the layered rock mass at an angle of 0 degrees shear strength parameters remain unchanged, the other angle of layered rock cohesion increases linearly but the internal friction angle based on the remained basically unchanged. The kind of layered rock mass shear, direct shear, three axial compression etc. The results of numerical experiments, illustrates the influence of loading condition of rock shear strength parameters of layered rock mass. The loading state of similar rock mass in different test methods and the deformation and failure mechanism are different, there is a great difference between the shear strength parameters.
4) direct shear test of layered rock mass of the bearing plate test and field simulation with different pore water pressure, explores the influence of pore water pressure on the mechanical parameters of layered rock mass. The results show that the deformation modulus of layered rock mass with the increase of pore water pressure and change, but change characteristics because the obliquity varies; with the increase of pore water pressure, layered rock cohesion linearly decreases, the internal friction angle is basically the same.
5) based on the numerical experimental research results of stratified rock mass under different conditions, a functional relation formula for solving the mechanical parameters of layered rock mass under different conditions is established by referring to the state parameters of rock mass and the state influence factor.

【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU45

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