真空场对非饱和粘性土特性的影响研究
发布时间：2019-03-03 14:06
【摘要】：注浆技术是一种有效的加固地层、止水堵漏的方法。由于其施工工艺简单,适用范围广泛,所以在很多工程中得到了应用。注浆工艺适用的地层一般孔隙度较大或者在岩石裂隙中使用。然而,在实际工程中,常常会碰到孔隙度较小的砂土地层,当用传统的静压注浆工艺进行施工时,不是浆液的扩散半径不能满足要求,就是注浆压力过大造成地面隆起、开裂等现象,给工程施工带来了很大麻烦。近些年,一些学者研究了一种新的注浆工艺—真空注浆在粉细砂土层中的应用,取得了良好的效果,但是在渗透性更差的粘土地层的研究较为缺乏。由于粘土本身的特殊性,它的渗透性不但与孔隙度大小有关,还和粘土颗粒表面的结合水和双电层厚度也有很大关系。基于这种情况,针对非饱和粘土地层进行真空注浆技术试验研究有很重要的意义。本文通过室内模拟试验,分析了真空场对非饱和粘性土体性质的影响,通过试验得到了浆液在非饱和粘性土体中的扩散规律并论证了真空场和粘土渗透率的关系。本文的研究内容主要包括:(1)针对非饱和粘性土的性质及真空注浆试验的特点,自主设计了微型抽真空模型盒。(2)通过室内试验确定了酸性水玻璃浆液的合适配比,分析了温度对酸性水玻璃浆液凝胶时间和粘度的影响规律,以根据实验室温度选择合适的浆液配比。(3)通过微型抽真空模拟装置分析了不同抽真空时间和真空度大小对粘土中结合水和双电层的影响,并通过热重分析仪和Zeta电位仪进行测定并总结了影响规律。(4)进行了真空注浆模拟试验,对土体进行不同抽气时间和不同真空度下的注浆试验,分析注浆量、浆液扩散半径、扩散时间和注浆固结体的形状的变化规律,总结并论证了真空场对非饱和粘性土渗透率的影响。
[Abstract]:Grouting technology is an effective method to reinforce strata and stop leakage. Because of its simple construction technology and wide range of application, it has been applied in many projects. Grouting technology is generally suitable for large porosity in strata or used in rock fissures. However, in practical projects, sand strata with low porosity are often encountered. When the traditional static pressure grouting technology is used for construction, either the diffusion radius of the slurry cannot meet the requirements, or the grouting pressure is too large to cause the ground uplift. Cracking and other phenomena have brought a lot of trouble to the construction of the project. In recent years, some scholars have studied a new grouting technology-vacuum grouting in fine silty sand soil, and achieved good results, but there is a lack of research in clay strata with worse permeability. Due to the particularity of clay itself, the permeability of clay is related not only to the porosity, but also to the bound water and the thickness of electric double layer on the surface of clay particles. Based on this situation, it is of great significance to study the vacuum grouting technology for unsaturated clay strata. In this paper, the influence of vacuum field on the properties of unsaturated cohesive soil is analyzed by laboratory simulation test. The diffusion rule of slurry in unsaturated cohesive soil is obtained through the experiment, and the relationship between vacuum field and clay permeability is demonstrated. The main contents of this paper are as follows: (1) according to the properties of unsaturated cohesive soil and the characteristics of vacuum grouting test, a miniature vacuum pumping model box was designed. (2) the suitable ratio of acid water glass slurry was determined by laboratory test. The effect of temperature on gel time and viscosity of acidic water glass slurry was analyzed. According to the laboratory temperature, the suitable slurry ratio was selected. (3) the effects of different vacuum extraction time and vacuum degree on the binding water and electric double layer in clay were analyzed by means of a miniature vacuum simulation device. The influence law was summarized by thermogravimetric analyzer and Zeta potentiometer. (4) vacuum grouting simulation test was carried out on soil under different pumping time and different vacuum degree, and the grouting quantity was analyzed. The influence of vacuum field on the permeability of unsaturated cohesive soil is summarized and demonstrated by the variation rule of slurry diffusion radius, diffusion time and the shape of grouting consolidation.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU442
本文编号：2433765
[Abstract]:Grouting technology is an effective method to reinforce strata and stop leakage. Because of its simple construction technology and wide range of application, it has been applied in many projects. Grouting technology is generally suitable for large porosity in strata or used in rock fissures. However, in practical projects, sand strata with low porosity are often encountered. When the traditional static pressure grouting technology is used for construction, either the diffusion radius of the slurry cannot meet the requirements, or the grouting pressure is too large to cause the ground uplift. Cracking and other phenomena have brought a lot of trouble to the construction of the project. In recent years, some scholars have studied a new grouting technology-vacuum grouting in fine silty sand soil, and achieved good results, but there is a lack of research in clay strata with worse permeability. Due to the particularity of clay itself, the permeability of clay is related not only to the porosity, but also to the bound water and the thickness of electric double layer on the surface of clay particles. Based on this situation, it is of great significance to study the vacuum grouting technology for unsaturated clay strata. In this paper, the influence of vacuum field on the properties of unsaturated cohesive soil is analyzed by laboratory simulation test. The diffusion rule of slurry in unsaturated cohesive soil is obtained through the experiment, and the relationship between vacuum field and clay permeability is demonstrated. The main contents of this paper are as follows: (1) according to the properties of unsaturated cohesive soil and the characteristics of vacuum grouting test, a miniature vacuum pumping model box was designed. (2) the suitable ratio of acid water glass slurry was determined by laboratory test. The effect of temperature on gel time and viscosity of acidic water glass slurry was analyzed. According to the laboratory temperature, the suitable slurry ratio was selected. (3) the effects of different vacuum extraction time and vacuum degree on the binding water and electric double layer in clay were analyzed by means of a miniature vacuum simulation device. The influence law was summarized by thermogravimetric analyzer and Zeta potentiometer. (4) vacuum grouting simulation test was carried out on soil under different pumping time and different vacuum degree, and the grouting quantity was analyzed. The influence of vacuum field on the permeability of unsaturated cohesive soil is summarized and demonstrated by the variation rule of slurry diffusion radius, diffusion time and the shape of grouting consolidation.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU442
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