台背回填中气泡混合轻质土性能的试验研究
发布时间：2018-07-28 18:46
【摘要】：桥头跳车成为世界性公路工程的通病病害,长期以来一直困扰着公路工程的建设和使用。气泡混合轻质土是由水泥、原料土、发泡剂以及水混合搅拌而成,其主要的特性是密度小、具有一定强度、流动性好、固化后可直立等,用于台背的回填可预防及减小产生桥头跳车危害的产生。通过对国内外有关气泡混合轻质土研究的系统调研,明确了目前气泡混合轻质土的发展现状,总结了目前气泡混合轻质土的发展中存在的不足,通过对其不足进行分析研究,确立了研究内容和研究方法等。通过对两种工程废弃土(湿陷性黄土和粉质粘土)的密度试验、颗粒级配试验、液塑限试验等进行研究,明确两种土的基本物理性能,首次使用这两种土做为原料土进行气泡混合轻质土的研究;通过对国内外有关发泡剂的资料收集和研究,明确了各类发泡剂的优缺点,筛选出目前国内外常用于工程施工的发泡剂种类,通过其发泡倍率试验、气泡群密度试验、沉降距试验和经济因素等进行对比选择出发泡剂种类进行气泡混合轻质土的制备。报告了气泡混合轻质土用途的现状并进行简单的论述,明确了气泡混合轻质土在台背回填中应用的优势性;通过对气泡混合轻质土拌合的研究、拌合好气泡混合轻质土浆体后进行湿容重试验,流动度试验以及适应性试验,得出气泡混合轻质土具有较小的密度,且具有良好的流动性能,满足实际工程的需要;通过对标准养护后的气泡混合轻质土试件的密度、吸水率等试验研究,确定出试件具有较轻的密度,气泡的闭合性能较好的配合比。对气泡混合轻质土标准养护试件进行了无侧限抗压强度试验,并进行分析研究,确定原料土及气泡掺量对抗压强度的影响,确定了合理的原料土及气泡的掺量;对抗压强度试验、干湿循环试验和冻融循环试验后的试件,对其内部的结构进行分析研究;通过气泡混合轻质土标准养护试件的耐久性(干湿循环试验以及冻融循环试验)进行试验研究,得出干湿循环和冻融循环对抗压强度的影响,以及原料土和气泡掺量对耐久性能的影响。结合数值模拟气泡混合轻质土回填的工后沉降量,综合以上试验结果,确定出原料土和气泡的含量范围。
[Abstract]:Bridgehead jumping has become a common disease of highway engineering all over the world, which has been puzzling the construction and use of highway engineering for a long time. Bubble mixing lightweight soil is made of cement, raw material soil, foaming agent and water mixing. Its main characteristics are small density, certain strength, good fluidity, upright after curing, etc. Backfilling for abutment backfilling can prevent and reduce the harm of bridge-head jumping. Based on the systematic investigation of bubble mixed lightweight soil at home and abroad, the present development situation of bubble mixed lightweight soil is clarified, and the shortcomings in the development of bubble mixed lightweight soil are summarized, and the shortcomings are analyzed and studied. The research contents and methods are established. The basic physical properties of two kinds of waste engineering soil (collapsible loess and silty clay) were studied by means of density test, particle gradation test and liquid-plastic limit test. It is the first time to use these two kinds of soil as raw material to study the bubble mixed light soil, and through collecting and studying the information about foaming agent at home and abroad, the advantages and disadvantages of all kinds of foaming agents are clarified. The types of foaming agents which are commonly used in engineering construction at home and abroad are selected. Through the comparison of foaming ratio test, bubble group density test, settlement distance test and economic factors, the types of foaming agents are selected to prepare bubble mixed lightweight soil. This paper reports the present situation of the application of bubble mixed lightweight soil and discusses briefly the superiority of bubble mixed light soil in backfill of platform, and through the research on mixing of bubble mixed light soil, The wet bulk density test, fluidity test and adaptability test are carried out after mixing the light soil slurry with bubbles. It is concluded that the mixed light soil with bubble has small density and good fluidity, which can meet the needs of practical engineering. Through the experimental study on density and water absorption rate of the light soil samples after standard curing, it is determined that the sample has a lighter density and a better mixture ratio of the bubble closure performance. The unconfined compressive strength test was carried out on the standard curing specimen of light soil mixed with bubble, and the influence of the content of raw soil and bubble on the compressive strength was determined, and the reasonable content of raw soil and bubble was determined. The internal structure of the specimens after compressive strength test, dry and wet cycle test and freeze-thaw cycle test were analyzed and studied. The durability (dry and wet cycle test and freeze-thaw cycle test) of standard curing specimen of light soil with bubble mixing was studied, and the influence of wet and dry cycle and freeze-thaw cycle on compressive strength was obtained. And the influence of the content of raw soil and bubble on the durability. Combined with the numerical simulation of the settlement of the backfilled light soil mixed with bubble, the content range of the raw material soil and the bubble is determined by synthesizing the above experimental results.
【学位授予单位】：河北建筑工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1
本文编号：2151260
[Abstract]:Bridgehead jumping has become a common disease of highway engineering all over the world, which has been puzzling the construction and use of highway engineering for a long time. Bubble mixing lightweight soil is made of cement, raw material soil, foaming agent and water mixing. Its main characteristics are small density, certain strength, good fluidity, upright after curing, etc. Backfilling for abutment backfilling can prevent and reduce the harm of bridge-head jumping. Based on the systematic investigation of bubble mixed lightweight soil at home and abroad, the present development situation of bubble mixed lightweight soil is clarified, and the shortcomings in the development of bubble mixed lightweight soil are summarized, and the shortcomings are analyzed and studied. The research contents and methods are established. The basic physical properties of two kinds of waste engineering soil (collapsible loess and silty clay) were studied by means of density test, particle gradation test and liquid-plastic limit test. It is the first time to use these two kinds of soil as raw material to study the bubble mixed light soil, and through collecting and studying the information about foaming agent at home and abroad, the advantages and disadvantages of all kinds of foaming agents are clarified. The types of foaming agents which are commonly used in engineering construction at home and abroad are selected. Through the comparison of foaming ratio test, bubble group density test, settlement distance test and economic factors, the types of foaming agents are selected to prepare bubble mixed lightweight soil. This paper reports the present situation of the application of bubble mixed lightweight soil and discusses briefly the superiority of bubble mixed light soil in backfill of platform, and through the research on mixing of bubble mixed light soil, The wet bulk density test, fluidity test and adaptability test are carried out after mixing the light soil slurry with bubbles. It is concluded that the mixed light soil with bubble has small density and good fluidity, which can meet the needs of practical engineering. Through the experimental study on density and water absorption rate of the light soil samples after standard curing, it is determined that the sample has a lighter density and a better mixture ratio of the bubble closure performance. The unconfined compressive strength test was carried out on the standard curing specimen of light soil mixed with bubble, and the influence of the content of raw soil and bubble on the compressive strength was determined, and the reasonable content of raw soil and bubble was determined. The internal structure of the specimens after compressive strength test, dry and wet cycle test and freeze-thaw cycle test were analyzed and studied. The durability (dry and wet cycle test and freeze-thaw cycle test) of standard curing specimen of light soil with bubble mixing was studied, and the influence of wet and dry cycle and freeze-thaw cycle on compressive strength was obtained. And the influence of the content of raw soil and bubble on the durability. Combined with the numerical simulation of the settlement of the backfilled light soil mixed with bubble, the content range of the raw material soil and the bubble is determined by synthesizing the above experimental results.
【学位授予单位】：河北建筑工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1
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