【摘要】：注漿理論和注漿現(xiàn)場(chǎng)實(shí)踐發(fā)展主要呈現(xiàn)兩大特征:(1)注漿理論遠(yuǎn)遠(yuǎn)落后于注漿實(shí)踐的發(fā)展;(2)巖體注漿落后于土體注漿的發(fā)展。針對(duì)裂隙巖體注漿在理論和時(shí)間方面存在的主要問(wèn)題,論文依托甘肅北山核廢料處置庫(kù)預(yù)選區(qū)十月井?dāng)嗔炎{止水及其長(zhǎng)期穩(wěn)定問(wèn)題,采用理論分析、室內(nèi)試驗(yàn)、數(shù)值模擬和現(xiàn)場(chǎng)調(diào)研實(shí)例相結(jié)合的方法開(kāi)展系列研究,取得的主要研究成果有:(1)在借鑒國(guó)內(nèi)外核廢料處置庫(kù)裂隙巖體注漿研究的基礎(chǔ)上,結(jié)合北山花崗巖特殊的地質(zhì)及水文條件,進(jìn)行了注漿材料優(yōu)化配比試驗(yàn),獲得了以超細(xì)水泥為基料的最優(yōu)注漿材料配比。(2)結(jié)合賓漢姆流體流變理論、N-S運(yùn)動(dòng)方程和流體連續(xù)性方程,推導(dǎo)了裂隙巖體漿液擴(kuò)散模型,漿液的流速與壓力梯度存在顯著的非線性關(guān)系。考慮到賓漢姆漿液粘度的時(shí)變性,結(jié)合現(xiàn)有的典型漿液粘度時(shí)變性方程,獲得了時(shí)變賓漢姆流體漿液在裂隙中的流動(dòng)規(guī)律:漿液粘度的改變對(duì)擴(kuò)散路徑中的漿液壓力有著較大的影響;隨著漿液粘度的增加,漿液壓力的衰減速度會(huì)逐漸增大,隨著擴(kuò)散范圍的增大壓力的衰減梯度逐漸減小。(3)基于離散元的裂隙巖體漿液滲流應(yīng)力耦合分析方法,分析獲得了單一裂隙注漿滲流擴(kuò)散過(guò)程中漿液壓力的隨擴(kuò)散范圍的衰減規(guī)律,漿液在高水灰比和裂隙開(kāi)度較大情況下近似牛頓流體呈線性衰減;建立交叉裂隙注漿滲流模型,得到了注漿系統(tǒng)中可控因素(注漿壓力、注漿時(shí)間和注漿材料)和不可控因素(地應(yīng)力大小、側(cè)壓力系數(shù)、裂隙開(kāi)度、裂隙傾角、裂隙間距和跡長(zhǎng)、裂隙粗糙度)對(duì)賓漢姆流體擴(kuò)散的影響規(guī)律,這些因素直接和間接影響了漿液的擴(kuò)散。(4)基于蒙特卡洛法編制了離散裂隙網(wǎng)絡(luò)DFN生成程序,結(jié)合北山地區(qū)采石場(chǎng)BS05鉆孔地質(zhì)資料,生成離散裂隙網(wǎng)絡(luò),獲得了圍巖滲透系數(shù)分布圖,并進(jìn)行了UDEC數(shù)值模擬分析,結(jié)果表明:對(duì)于滲透性較差的裂隙網(wǎng)絡(luò)區(qū)域,提高相應(yīng)注漿孔的注漿壓力或者延長(zhǎng)時(shí)間可以達(dá)到較好的擴(kuò)散范圍,根據(jù)模擬結(jié)果提出了最優(yōu)注漿參數(shù),并給出了基于離散裂隙網(wǎng)絡(luò)的注漿設(shè)計(jì)步驟。
[Abstract]:There are two main characteristics of grouting theory and grouting field practice: (1) grouting theory lags far behind the development of grouting practice; (2) rock grouting lags behind the development of soil grouting. In view of the main problems existing in theory and time of grouting in fractured rock mass, the paper relies on the problems of water-stopping and long-term stability of October well fracture grouting in the pre-selected area of Beishan Nuclear waste disposal depot in Gansu Province, and adopts theoretical analysis and laboratory test. A series of studies are carried out by combining numerical simulation with field investigation examples. The main research results are as follows: (1) on the basis of the research on grouting of fractured rock mass in nuclear waste disposal depots at home and abroad, In combination with the special geological and hydrological conditions of Beishan granite, the optimum mixture ratio of grouting material is obtained by using superfine cement as the base material. (2) combined with Bingham fluid rheology theory, N-S equation of motion and fluid continuity equation are used to deduce the slurry diffusion model of fractured rock mass. There is a significant nonlinear relationship between the velocity of slurry and the pressure gradient. Considering the time-varying behavior of the Bingham viscosity, combined with the existing time-varying equations of the typical viscosity of the slurry, The flow law of time-varying Bingham fluid slurry in fracture is obtained: the change of slurry viscosity has a great influence on the slurry pressure in the diffusion path; With the increase of slurry viscosity, the attenuation rate of slurry pressure will gradually increase, and the attenuation gradient of slurry pressure will decrease with the increase of diffusion range. (3) the seepage stress coupling analysis method based on discrete element method for slurry flow in fractured rock mass. The attenuation law of grouting pressure with diffusion range in the process of single fissure grouting seepage diffusion is obtained. The approximate Newtonian fluid is linear attenuated under the condition of high water-cement ratio and large crack opening. The seepage model of cross fissure grouting is established, and the controllable factors (grouting pressure, grouting time and grouting material) and uncontrollable factors (earth stress, lateral pressure coefficient, crack opening, crack inclination) in grouting system are obtained. The influence of crack spacing, trace length and crack roughness on Bingham fluid diffusion is directly and indirectly affected by these factors. (4) based on Monte Carlo method, a discrete fissure network DFN generation program is developed. Combined with the geological data of BS05 borehole in Beishan area, the discrete fracture network was formed, the distribution map of surrounding rock permeability coefficient was obtained, and the UDEC numerical simulation analysis was carried out. The results showed that: for the fracture network area with poor permeability, A better diffusion range can be achieved by increasing the grouting pressure or prolonging time of the corresponding grouting holes. According to the simulation results, the optimal grouting parameters are proposed, and the grouting design steps based on discrete fracture network are given.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TL942;TU45

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