注浆抬升的数值模拟及抬升规律研究

发布时间：2018-06-12 22:24

本文选题：劈裂注浆 + 压密注浆　；参考：《北京交通大学》2014年硕士论文

【摘要】：摘要：注浆抬升是采用注浆的方式加固软弱松散地层,通过浆液的注入,借助浆液传递注浆压力,从而使被注土体产生向上位移。本文在前人研究成果的基础上,探讨总结了劈裂注浆、压密注浆、渗透注浆的注浆力学及浆液扩散理论,研究了三种注浆方式之间的区别,并采用数值模拟的方式,深入研究了注浆的力学特性、不同因素对注浆抬升效果的影响、不同因素对注浆最大抬升量和地表位移变化的影响规律。其主要内容如下： (1)在广泛研究中外文献的基础上,总结了注浆工程的理论研究现状,探讨了注浆抬升机理,明确了不同注浆形式下,土体的破坏形式,并说明了压密注浆和渗透注浆极限压力的存在。 (2)采用数值模拟的手段,对劈裂注浆、压密注浆、渗透注浆进行了数值计算,通过对模拟过程进行注浆力学特性分析,确定数值模拟结果的合理性。通过对数值计算结果进行分析,确定了不同注浆方式下土体的破坏模式、土体内孔隙压力和小主应力的变化规律、注浆引起土体内部位移的传递方式以及注浆引起的土体内体积应变变化规律,明确了注浆的力学特性、加固机理以及三种注浆形式之间的联系。 (3)对不同注浆形式的抬升模式进行了大量计算,得出了注浆深度、地层弹性模量、注浆压力等不同因素对注浆抬升量的影响规律以及对注浆引起的地表抬升范围的影响规律。
[Abstract]:Absrtact: grouting uplift is used to strengthen soft loose strata by grouting, through the injection of slurry, the grouting pressure is transferred with the aid of grouting, thus causing upward displacement of injected soil. Based on the previous research results, this paper discusses and summarizes the grouting mechanics and grouting diffusion theory of split grouting, compaction grouting and permeable grouting, studies the differences between the three grouting modes, and adopts the numerical simulation method. The mechanical properties of grouting, the influence of different factors on grouting uplift and the influence of different factors on the maximum uplift and surface displacement of grouting are studied. The main contents are as follows: (1) on the basis of extensive research on Chinese and foreign literature, the present situation of theoretical research on grouting engineering is summarized, the mechanism of grouting uplift is discussed, and the failure forms of soil under different grouting forms are defined. The existence of the limit pressure of compaction grouting and permeable grouting is explained. The numerical simulation method is used to calculate the splitting grouting, the compaction grouting and the permeable grouting, and the mechanical properties of the grouting are analyzed through the simulation process. The rationality of the numerical simulation results is determined. By analyzing the results of numerical calculation, the failure mode of soil, the variation of pore pressure and small principal stress in soil under different grouting modes are determined. The transfer mode of internal displacement caused by grouting and the variation law of volume strain in soil caused by grouting have made clear the mechanical characteristics of grouting. The reinforcement mechanism and the relationship between the three grouting forms. The uplift modes of different grouting forms have been calculated extensively, and the grouting depth and elastic modulus of the stratum have been obtained. The influence of grouting pressure and other factors on grouting uplift and on the range of surface uplift caused by grouting.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU472

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