高放废物处置库北山预选区裂隙岩体注浆特性研究
发布时间：2018-11-13 12:34
【摘要】：注浆理论和注浆现场实践发展主要呈现两大特征:(1)注浆理论远远落后于注浆实践的发展;(2)岩体注浆落后于土体注浆的发展。针对裂隙岩体注浆在理论和时间方面存在的主要问题,论文依托甘肃北山核废料处置库预选区十月井断裂注浆止水及其长期稳定问题,采用理论分析、室内试验、数值模拟和现场调研实例相结合的方法开展系列研究,取得的主要研究成果有:(1)在借鉴国内外核废料处置库裂隙岩体注浆研究的基础上,结合北山花岗岩特殊的地质及水文条件,进行了注浆材料优化配比试验,获得了以超细水泥为基料的最优注浆材料配比。(2)结合宾汉姆流体流变理论、N-S运动方程和流体连续性方程,推导了裂隙岩体浆液扩散模型,浆液的流速与压力梯度存在显著的非线性关系。考虑到宾汉姆浆液粘度的时变性,结合现有的典型浆液粘度时变性方程,获得了时变宾汉姆流体浆液在裂隙中的流动规律:浆液粘度的改变对扩散路径中的浆液压力有着较大的影响;随着浆液粘度的增加,浆液压力的衰减速度会逐渐增大,随着扩散范围的增大压力的衰减梯度逐渐减小。(3)基于离散元的裂隙岩体浆液渗流应力耦合分析方法,分析获得了单一裂隙注浆渗流扩散过程中浆液压力的随扩散范围的衰减规律,浆液在高水灰比和裂隙开度较大情况下近似牛顿流体呈线性衰减;建立交叉裂隙注浆渗流模型,得到了注浆系统中可控因素(注浆压力、注浆时间和注浆材料)和不可控因素(地应力大小、侧压力系数、裂隙开度、裂隙倾角、裂隙间距和迹长、裂隙粗糙度)对宾汉姆流体扩散的影响规律,这些因素直接和间接影响了浆液的扩散。(4)基于蒙特卡洛法编制了离散裂隙网络DFN生成程序,结合北山地区采石场BS05钻孔地质资料,生成离散裂隙网络,获得了围岩渗透系数分布图,并进行了UDEC数值模拟分析,结果表明:对于渗透性较差的裂隙网络区域,提高相应注浆孔的注浆压力或者延长时间可以达到较好的扩散范围,根据模拟结果提出了最优注浆参数,并给出了基于离散裂隙网络的注浆设计步骤。
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TL942;TU45
本文编号：2329122
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TL942;TU45
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