SDG土壤密度仪填土密度检测的标准化研究及可靠度评价

发布时间：2018-07-04 18:09

本文选题：SDG土壤密度仪 + 压实度　；参考：《苏州科技学院》2014年硕士论文

【摘要】：SDG土壤密度仪路基压实度检测属于一种新型无损快速填土密度检测技术,可克服常规检测方法实时性差、检测效率低等缺点,有利于对现场填土质量进行动态控制,但是国内相关研究较少,尚处于探索阶段。为此,本文结合常熟、昆山工程检测中心的检测项目,通过现场测试和室内模拟试验等方法,对SDG土壤密度仪填土密度检测的一系列影响因素进行了详细的分析,并进一步对SDG土壤密度仪在素粘性土、固化土、粉土、砂土等条件下实施快速检测土基压实度的可靠性进行了评价,以及针对施工单位和质量检测单位的不同的检测要求建立了各个土质条件下的SDG土壤密度仪干密度测试误差的修正方法。同时,综合本文的研究成果,针对SDG土壤密度仪填土密度检测的特点,建立了一套标准化测试程序,为SDG土壤密度仪的实际工程运用提供指导。1、通过室内模拟现场土基填土密度检测,对SDG土壤密度仪前置参数进行了系统的研究,分析了前置参数在SDG土壤密度仪测试中的作用；并进一步在室内模拟了现场压实度检测中的环境因素,分析了这些环境因素对SDG土壤密度仪干密度的影响,为建立标准化测试程序提供了理论依据。2、结合常熟、昆山工程检测中心的检测项目,在现场不同土质条件下获得了大量的SDG土壤密度仪与灌砂法测试数据。并在此基础上,对素粘性土、粉土、固化土、砂土等常见土质条件下的SDG土壤密度仪检测结果进行了统计分析,获得了相关的统计指标,从而对不同土质条件下的SDG土壤密度仪的可靠度进行了合理科学的评价。3、通过对SDG土壤密度仪与灌砂法的测试干密度的对比,分析了SDG土壤密度仪的误差来源与表现形式,并在此基础上,提出了两种不同的SDG土壤密度仪干密度修正方法—补偿法和整体修正模型,并进行了修正效果检验。结果表明,经修正后,SDG土壤密度仪的测试精度均有很大的提高,可以较好的反映填土的实际密度。4、结合现场填土密度检测的特点及SDG土壤密度仪的使用要求,提出了一套标准化测试程序,为SDG土壤密度仪在填土密度检测的应用提供指导,以推进SDG土壤密度仪的实际工程应用。
[Abstract]:The measurement of subgrade compaction by SDG soil densitometer is a new kind of nondestructive and rapid filling density detection technology, which can overcome the shortcomings of poor real-time and low detection efficiency of conventional testing methods, and is beneficial to the dynamic control of field filling quality. But the domestic related research is relatively few, is still in the exploration stage. Therefore, combining with the testing items of Changshu and Kunshan Engineering testing Center, through field test and indoor simulation test, a series of influencing factors of soil density detection by SDG soil density meter are analyzed in detail. Furthermore, the reliability of rapid detection of soil compaction by SDG soil densitometer under the conditions of plain clay, solidified soil, silt, sand and so on is evaluated. According to the different testing requirements of construction units and quality inspection units, a correction method of SDG soil density measurement error under various soil quality conditions is established. At the same time, according to the characteristics of SDG soil density meter, a set of standardized test program is established. In order to provide guidance for the practical application of SDG soil densitometer, this paper studies systematically the preposition parameters of SDG soil densitometer by simulating the field soil fill density measurement in laboratory, and analyzes the function of the preposition parameters in the SDG soil density meter test. Furthermore, the paper simulates the environmental factors in the field compactness test, analyzes the influence of these environmental factors on the dry density of SDG soil density meter, and provides a theoretical basis for establishing a standardized test program, which is based on Changshu. A large amount of SDG soil density meter and sand irrigation test data were obtained in the project of Kunshan Engineering testing Center under different soil quality in the field. On the basis of this, the results of SDG soil density measurement under common soil conditions, such as plain clay, silt, solidified soil, sand and so on, were statistically analyzed, and the relevant statistical indexes were obtained. Therefore, the reliability of SDG soil densitometer under different soil quality was evaluated scientifically and reasonably. The error source and expression form of SDG soil densitometer were analyzed by comparing the dry density of SDG soil densitometer with that of sand filling method. On the basis of this, two kinds of SDG soil density correction methods, the compensation method and the whole correction model, are put forward, and the effect of the correction is tested. The results show that the precision of SDG soil density meter has been greatly improved, and it can reflect the actual density of fill. 4. Combined with the characteristics of field soil density detection and the application requirements of SDG soil density meter, A set of standardized test program is proposed to provide guidance for the application of SDG soil density meter in soil filling density measurement, in order to promote the practical engineering application of SDG soil density meter.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

【参考文献】