红黏土水泥浆液在岩溶坝区防渗帷幕中的应用研究
发布时间：2019-05-24 02:10
【摘要】：我国云南地区喀斯特地貌分布广泛,由于可溶岩中存在岩溶泉、溶沟溶洞、溶蚀裂隙等岩溶形态,水利工程及水资源利用受到严重影响,防渗堵漏工程尤为重要。在运用注浆技术进行防渗加固时,通常选用防渗帷幕灌浆进行处理效果最好。对于灌浆工程而言,灌浆材料的稳定性、可灌注性作为主要技术问题影响着工程的安全,而工程造价作为经济问题也同等重要。本文通过一系列室内试验,对比分析了不同的水泥和速凝剂掺量对红黏土水泥浆液的稳定性、可灌注性、浆液结石体的渗透性和抗压强度等性能的影响,综合利用红黏土、水泥和速凝剂的优良性能,使红黏土水泥浆液凝结过程以及浆液结石体的力学参数在一定范围内可调,并根据变化规律提高对红黏土水泥浆液在注浆过程中可灌注性的控制,使浆液能够更好地适应不同地质条件,增强注浆效果,减少工程造价。研究结果表明:红黏土水泥浆液析水率随水泥掺量增加而增大,浆液稳定性降低,速凝剂掺量对浆液析水率影响不显著,试验中各组浆液析水率都小于5%,为稳定浆液;浆液的胶凝时间随速凝剂掺量变化从几十分钟至几秒钟可调,速凝剂掺量为3g/100ml原浆时,红黏土水泥浆液的胶凝时间最短仅7s;浆液结石率随速凝剂增加而增大,6g/100ml原浆时出现膨胀现象,水泥掺量越多浆液结石体收缩越明显;红黏土水泥浆液的渗透系数随着水泥掺量的增加而减小,速凝剂掺量对渗透系数影响不显著;对红黏土水泥浆液结石体3天、7天、28天抗压强度进行分析,浆液结石体早期强度发展缓慢,后期增长较快,3天最小强度0.13MPa,28天最大强度3.35MPa,各试验组浆液结石体抗压强度均达到注浆材料要求。结合云南省昆明市石林县某水库除险加固工程,通过室内试验确定红黏土水泥浆液的最优配比为:红黏土水泥浆液粘度控制在25-30s之间,速凝剂掺量6g/100ml原浆,水泥掺量15g/100ml原浆。运用有限差分软件FLAC3D进行数值模型计算,对正常蓄水位条件下,天然工况和治理工况坝体防渗处理部位应力特性及复合坝体位移特性进行模拟分析。研究表明:采用红黏土水泥浆液进行帷幕灌浆后,防渗处理部位的应力应变在材料许可范围内,防渗处理效果良好,达到工程安全要求。
[Abstract]:The karst features of the karst spring, the karst cave, the dissolution and the fissure, etc. of the karst spring, the karst cave, the dissolution fracture and the like exist in the Yunnan area of China, and the water conservancy project and the water resources utilization are seriously affected, and the anti-seepage and leakage-stopping project is of particular importance. In the case of anti-seepage strengthening by using the grouting technology, it is the best to choose the anti-seepage curtain grouting. In the case of grouting, the stability of grouting material and the ability of pouring can affect the safety of the project as the main technical problem, and the construction cost is equally important as the economic problem. In this paper, through a series of laboratory tests, the effects of different cement and accelerator content on the properties of the red clay cement slurry, the filling property, the permeability and the compressive strength of the slurry stone body are analyzed, and the excellent properties of the red clay, the cement and the accelerator are comprehensively utilized, the coagulation process of the red clay cement slurry and the mechanical parameters of the slurry stone body can be adjusted in a certain range, and the controllability of the filling property of the red clay cement slurry in the grouting process can be improved according to the change law, so that the slurry can better adapt to different geological conditions and enhance the grouting effect, And the construction cost is reduced. The results show that the water-out rate of the slurry of red clay is increased with the increase of the content of the cement, the stability of the slurry is reduced, the influence of the admixture amount on the water-removal rate of the slurry is not significant, and the water-separating rate of the slurry in the test is less than 5%, which is a stable slurry; the gelling time of the slurry changes from the dozens of minutes to a few seconds with the change of the admixture amount of the accelerator, the gelling time of the red clay cement slurry is the shortest of only 7 s when the admixture amount of the accelerator is 3 g/100 ml, The permeability coefficient of the red clay cement slurry was reduced with the increase of the content of the cement, the influence of the admixture amount on the permeability coefficient was not significant, and the compressive strength of the cement slurry of the red clay was 3 days,7 days and 28 days. The early strength development of the slurry stone body is slow, the later growth is fast, the minimum strength of 3 days is 0.13 MPa, the maximum strength of 28 days is 3.35 MPa, and the compressive strength of the slurry stone body of each test group reaches the requirements of the grouting material. The optimum proportion of red clay cement slurry is determined as follows: the viscosity of the red clay cement slurry is controlled between 25 and 30 s, the admixture amount of the accelerator is 6 g/100 ml, and the cement content is 15 g/100 ml. The finite difference software FLAC3D is used to calculate the numerical model, and the stress characteristics of the anti-seepage treatment part of the dam body and the displacement characteristic of the composite dam body are simulated and analyzed under the condition of normal storage level. The research shows that after the curtain grouting is carried out with red clay cement slurry, the stress strain of the anti-seepage treatment part is within the material permission range, the anti-seepage treatment effect is good, and the engineering safety requirements are met.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV543.5
本文编号：2484455
[Abstract]:The karst features of the karst spring, the karst cave, the dissolution and the fissure, etc. of the karst spring, the karst cave, the dissolution fracture and the like exist in the Yunnan area of China, and the water conservancy project and the water resources utilization are seriously affected, and the anti-seepage and leakage-stopping project is of particular importance. In the case of anti-seepage strengthening by using the grouting technology, it is the best to choose the anti-seepage curtain grouting. In the case of grouting, the stability of grouting material and the ability of pouring can affect the safety of the project as the main technical problem, and the construction cost is equally important as the economic problem. In this paper, through a series of laboratory tests, the effects of different cement and accelerator content on the properties of the red clay cement slurry, the filling property, the permeability and the compressive strength of the slurry stone body are analyzed, and the excellent properties of the red clay, the cement and the accelerator are comprehensively utilized, the coagulation process of the red clay cement slurry and the mechanical parameters of the slurry stone body can be adjusted in a certain range, and the controllability of the filling property of the red clay cement slurry in the grouting process can be improved according to the change law, so that the slurry can better adapt to different geological conditions and enhance the grouting effect, And the construction cost is reduced. The results show that the water-out rate of the slurry of red clay is increased with the increase of the content of the cement, the stability of the slurry is reduced, the influence of the admixture amount on the water-removal rate of the slurry is not significant, and the water-separating rate of the slurry in the test is less than 5%, which is a stable slurry; the gelling time of the slurry changes from the dozens of minutes to a few seconds with the change of the admixture amount of the accelerator, the gelling time of the red clay cement slurry is the shortest of only 7 s when the admixture amount of the accelerator is 3 g/100 ml, The permeability coefficient of the red clay cement slurry was reduced with the increase of the content of the cement, the influence of the admixture amount on the permeability coefficient was not significant, and the compressive strength of the cement slurry of the red clay was 3 days,7 days and 28 days. The early strength development of the slurry stone body is slow, the later growth is fast, the minimum strength of 3 days is 0.13 MPa, the maximum strength of 28 days is 3.35 MPa, and the compressive strength of the slurry stone body of each test group reaches the requirements of the grouting material. The optimum proportion of red clay cement slurry is determined as follows: the viscosity of the red clay cement slurry is controlled between 25 and 30 s, the admixture amount of the accelerator is 6 g/100 ml, and the cement content is 15 g/100 ml. The finite difference software FLAC3D is used to calculate the numerical model, and the stress characteristics of the anti-seepage treatment part of the dam body and the displacement characteristic of the composite dam body are simulated and analyzed under the condition of normal storage level. The research shows that after the curtain grouting is carried out with red clay cement slurry, the stress strain of the anti-seepage treatment part is within the material permission range, the anti-seepage treatment effect is good, and the engineering safety requirements are met.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV543.5
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