含水量与压实度联合修正路基验收弯沉理论及应用研究

发布时间：2018-10-08 09:25

【摘要】：路基是道路的主要承重基础,路基质量好坏直接关系到道路使用性能及寿命,正确评定路基质量是整个道路质量验收中非常关键的环节。目前我国评定路基质量主要指标是压实度和弯沉,路基压实度测试方法目前已成熟,弯沉评定标准取不利季节的弯沉值。实际上大部分工程是在非不利季节修筑完成,如果用非不利季节测定的路基弯沉值来评定路基质量,势必会达不到预期效果,故对路基弯沉进行季节修正很有必要。路基弯沉与路基回弹模量存在较好的相关关系。目前国内外关于路基弯沉季节修正的研究,均先研究路基弯沉与路基回弹模量之间的关系,根据路基回弹模量的变化规律来修正路基弯沉。路基弯沉季节修正方法研究均只是针对含水量(稠度)这一个主要的影响因素,并未考虑压实度对路基回弹模量的影响。这样路基回弹模量的季节修正公式虽然能反映回弹模量的变化规律,但是只考虑单个因素,其修正结果并不是很理想。本文采用湖南常德石门某道路工程路基弯沉与路基回弹模量检测数据,对比分析规范中推荐的路基弯沉与路基回弹模量相互转化的经验公式和理论公式,找出与工程实际相关性高的转化公式;然后针对湖南地区红黏土室内回弹模量试验,研究路基回弹模量的影响因素,采用灰关联法分析比较含水量、压实度对回弹模量的影响程度。分析结果表明,含水量对路基回弹模量的影响程度大于压实度;考虑多个影响因素的影响,采用含水量与压实度联合修正路基回弹模量,推导出含水量与压实度联合修正路基回弹模量公式;结合规范中推荐路基弯沉与路基回弹模量转换的理论计算公式,通过理论推导出含水量与压实度联合修正路基验收弯沉公式。对比分析规范中推荐路基验收弯沉修正方法、含水量(稠度)比路基验收弯沉修正方法、含水量与压实度联合修正路基验收弯沉方法的修正数据,结果表明采用含水量与压实度联合修正路基验收弯沉的效果更好。本文建立的路基验收弯沉季节修正公式能更好的反映路基弯沉变化规律,其路基验收弯沉季节修正结果能更好的指导实际工程施工;最后制定了一套适合路基弯沉季节验收的方法,使本文的研究成果能为实际施工服务。
[Abstract]:The subgrade is the main bearing foundation of the road, and the quality of the roadbed is directly related to the performance and service life of the road. The correct evaluation of the subgrade quality is the key link in the acceptance of the whole road quality. At present, the main index of subgrade quality evaluation in China is compaction degree and deflection. The test method of roadbed compaction degree is mature at present. In fact, most of the projects are completed in the non-unfavorable season. If the subgrade deflection value measured in the non-unfavorable season is used to evaluate the subgrade quality, it will not achieve the expected effect, so it is necessary to carry on the seasonal correction to the subgrade deflection. There is a good correlation between subgrade deflection and subgrade resilience modulus. At present, the relationship between subgrade deflection and subgrade resilience modulus is studied in the domestic and foreign researches on subgrade deflection season correction, and the subgrade deflection is corrected according to the variation law of subgrade resilience modulus. The methods of subgrade deflection season correction are only aimed at the main influencing factor of water content (consistency), and the influence of compaction on subgrade resilience modulus is not considered. In this way, the seasonal correction formula of subgrade resilience modulus can reflect the variation law of resilience modulus, but only considering a single factor, the correction result is not very ideal. Based on the test data of subgrade deflection and subgrade resilience modulus of a road project in Changde Shimen, Hunan Province, the empirical and theoretical formulas for the mutual transformation of subgrade deflection and subgrade resilience modulus recommended in the code are compared and analyzed in this paper. To find out the transformation formula which is highly related to the engineering practice, and then to study the influencing factors of subgrade resilience modulus for the indoor elastic modulus test of red clay in Hunan area, and to analyze and compare the water content by grey correlation method. The influence of compaction on resilience modulus. The results show that the influence of water content on subgrade resilience modulus is greater than that of compaction, considering the influence of many factors, the subgrade resilience modulus is modified by the combination of water content and compaction degree. The formula for correcting the modulus of resilience of subgrade with the combination of water content and compaction degree is deduced, and the theoretical formula for the conversion of subgrade deflection and modulus of resilience of subgrade is recommended in the code. The formula of water content and compaction is derived to modify the roadbed acceptance deflection. The correction method of roadbed acceptance deflection, the correction method of water content (consistency) compared with the method of roadbed acceptance deflection correction, and the correction data of roadbed acceptance deflection method with water content and compaction are recommended in the comparative analysis code. The results show that the combination of water content and compaction is better for correcting the roadbed acceptance deflection. The subgrade acceptance deflection seasonal correction formula established in this paper can better reflect the subgrade deflection change law, and its subgrade acceptance deflection season correction results can better guide the actual engineering construction. Finally, a set of methods suitable for the seasonal acceptance of subgrade deflection are developed, which makes the research results of this paper serve the actual construction.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1

【参考文献】

相关期刊论文 前10条

1 魏海兵;焦永春;高静;;基于灰关联法的边坡稳定影响因子敏感性分析[J];四川水力发电;2016年04期

2 王旭东;;沥青路面弯沉指标的探讨[J];公路交通科技;2015年01期

3 张旭亮;;公路路基含水量预估方法研究[J];公路工程;2014年03期

4 林小平;李兴华;凌建明;周亮;;路基土回弹模量湿度调整系数预估研究[J];同济大学学报(自然科学版);2011年10期

5 高志伟;王选仓;宋学艺;赵尔胜;王理吉;;新疆地区公路路基含水量年变化规律[J];长安大学学报(自然科学版);2011年03期

6 严秋荣;邹维列;邓卫东;;考虑含水量变化的路基回弹模量特性研究[J];公路交通技术;2010年05期

7 甘勇;胡卫东;;边坡稳定性影响因素的灰色关联分析[J];大众科技;2010年07期

8 崔璞;许凤莲;;不同土质回弹模量的试验探讨[J];科技信息;2010年19期

9 王选仓;马玉兰;张磊;;路基顶面回弹弯沉验收标准的修正[J];长安大学学报(自然科学版);2009年06期

10 郑木莲;王选仓;王崇涛;;路基弯沉检测标准[J];长安大学学报(自然科学版);2008年05期

相关硕士学位论文 前10条

1 张亚娟;山西省黄土路基回弹模量研究[D];长安大学;2015年

2 李旭丹;河南省沥青路面弯沉值季节影响系数的确定研究[D];长安大学;2013年

3 阚志涛;振动压路机的压实施工参数与压实工艺研究[D];长安大学;2011年

4 曹姣姣;基于辽宁地区试验路的路表弯沉季节影响系数研究[D];沈阳建筑大学;2012年

5 马玉兰;路基路面弯沉验收标准修正方法研究[D];长安大学;2008年

6 吴梁;路基土压实度检测技术研究[D];重庆交通大学;2008年

7 李聪;基于非饱和土理论的路基回弹模量研究[D];重庆交通大学;2007年

8 马博;路基验收弯沉影响因素及修正方法分析[D];长安大学;2007年

9 张亮梅;路基压实的空隙率控制法研究[D];长安大学;2006年

10 覃绮平;土基回弹模量影响因素及其相关关系研究[D];长安大学;2005年

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