紅黏土水泥漿液在巖溶壩區(qū)防滲帷幕中的應(yīng)用研究
發(fā)布時(shí)間：2019-05-24 02:10
【摘要】：我國(guó)云南地區(qū)喀斯特地貌分布廣泛,由于可溶巖中存在巖溶泉、溶溝溶洞、溶蝕裂隙等巖溶形態(tài),水利工程及水資源利用受到嚴(yán)重影響,防滲堵漏工程尤為重要。在運(yùn)用注漿技術(shù)進(jìn)行防滲加固時(shí),通常選用防滲帷幕灌漿進(jìn)行處理效果最好。對(duì)于灌漿工程而言,灌漿材料的穩(wěn)定性、可灌注性作為主要技術(shù)問題影響著工程的安全,而工程造價(jià)作為經(jīng)濟(jì)問題也同等重要。本文通過一系列室內(nèi)試驗(yàn),對(duì)比分析了不同的水泥和速凝劑摻量對(duì)紅黏土水泥漿液的穩(wěn)定性、可灌注性、漿液結(jié)石體的滲透性和抗壓強(qiáng)度等性能的影響,綜合利用紅黏土、水泥和速凝劑的優(yōu)良性能,使紅黏土水泥漿液凝結(jié)過程以及漿液結(jié)石體的力學(xué)參數(shù)在一定范圍內(nèi)可調(diào),并根據(jù)變化規(guī)律提高對(duì)紅黏土水泥漿液在注漿過程中可灌注性的控制,使?jié){液能夠更好地適應(yīng)不同地質(zhì)條件,增強(qiáng)注漿效果,減少工程造價(jià)。研究結(jié)果表明:紅黏土水泥漿液析水率隨水泥摻量增加而增大,漿液穩(wěn)定性降低,速凝劑摻量對(duì)漿液析水率影響不顯著,試驗(yàn)中各組漿液析水率都小于5%,為穩(wěn)定漿液;漿液的膠凝時(shí)間隨速凝劑摻量變化從幾十分鐘至幾秒鐘可調(diào),速凝劑摻量為3g/100ml原漿時(shí),紅黏土水泥漿液的膠凝時(shí)間最短僅7s;漿液結(jié)石率隨速凝劑增加而增大,6g/100ml原漿時(shí)出現(xiàn)膨脹現(xiàn)象,水泥摻量越多漿液結(jié)石體收縮越明顯;紅黏土水泥漿液的滲透系數(shù)隨著水泥摻量的增加而減小,速凝劑摻量對(duì)滲透系數(shù)影響不顯著;對(duì)紅黏土水泥漿液結(jié)石體3天、7天、28天抗壓強(qiáng)度進(jìn)行分析,漿液結(jié)石體早期強(qiáng)度發(fā)展緩慢,后期增長(zhǎng)較快,3天最小強(qiáng)度0.13MPa,28天最大強(qiáng)度3.35MPa,各試驗(yàn)組漿液結(jié)石體抗壓強(qiáng)度均達(dá)到注漿材料要求。結(jié)合云南省昆明市石林縣某水庫(kù)除險(xiǎn)加固工程,通過室內(nèi)試驗(yàn)確定紅黏土水泥漿液的最優(yōu)配比為:紅黏土水泥漿液粘度控制在25-30s之間,速凝劑摻量6g/100ml原漿,水泥摻量15g/100ml原漿。運(yùn)用有限差分軟件FLAC3D進(jìn)行數(shù)值模型計(jì)算,對(duì)正常蓄水位條件下,天然工況和治理工況壩體防滲處理部位應(yīng)力特性及復(fù)合壩體位移特性進(jìn)行模擬分析。研究表明:采用紅黏土水泥漿液進(jìn)行帷幕灌漿后,防滲處理部位的應(yīng)力應(yīng)變?cè)诓牧显S可范圍內(nèi),防滲處理效果良好,達(dá)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.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV543.5
本文編號(hào)：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.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV543.5
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