粉土路基压实控制指标的分析研究
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摘要
针对压实度指标不能充分体现含水量对粉土压实路基的影响,通过对粉土的击实特性和相同压实度下不同含水量压实粉土浸水与不浸水抗剪强度变化规律的分析,指出压实度作为粉土路基压实控制指标的不足,提出含气率作为粉土路基压实质量控制第二指标的科学性然后,结合试样含气率的变化规律以及不同击实能下含气率与干密度的关系,提出在保证压实度的前提下控制含气率不大于6%来确保粉土回填路基的压实质量。
The compaction index can not fully reflect the influence of water content on compaction roadbed of silty soil,based on the analysis of the compaction characteristics of silty soil and the change of the shear strength of compacted silt with different water content under the same compaction degree,the paper points out that the compaction degree is the deficiency of the compaction control index of the silt subgrade and puts forward that the gasbearing rate as the second index of compaction quality control of silty roadbed is scientific then,combined with the variation of the gas content and the relationship between the gas content and the dry density under different compaction energy,the paper puts forward that the control of the gas holdup is not greater than 6 % to ensure the compaction quality of the backfill roadbed.
The compaction index can not fully reflect the influence of water content on compaction roadbed of silty soil,based on the analysis of the compaction characteristics of silty soil and the change of the shear strength of compacted silt with different water content under the same compaction degree,the paper points out that the compaction degree is the deficiency of the compaction control index of the silt subgrade and puts forward that the gasbearing rate as the second index of compaction quality control of silty roadbed is scientific then,combined with the variation of the gas content and the relationship between the gas content and the dry density under different compaction energy,the paper puts forward that the control of the gas holdup is not greater than 6 % to ensure the compaction quality of the backfill roadbed.
引文
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[2]景宏君,张斌.黄土路基强度规律[J].交通运输工程学报,2004,12(2):14-18.
[3]张克恭,刘松玉.土力学[M].北京:中国建筑工业出版社,2010.
[4]余中杰.粉土压实机理研究[D].西安:长安大学,2007.
[5]武科,马国梁,马明月,等.公路路基粉土工程特性试验研究[J].中南大学学报(自然科学版),2009,40(6):1724-1731.
[6] HEAD K H. Manual of soil laboratory testing[M]. London:Pentech Press,1980.
[7]陈仲颐,周景星,王洪瑾.土力学[M].北京:清华大学出版社,1994.
[8] BRAJA M D. Principles of geotechinal engineering[M]. Pacific Grove,CA:Brooks Cole,2002.
[9] COKCA E,EROL E,ARMANGIL F. Effects of compaction moisture content on the shear strength of an unsaturated clay[J]. Geotechnical and Geological Engineering,2004(22):168-208.
[10]文桃.西北黄土状硫酸盐渍土工程性质与改良治理研究[D].兰州:兰州理工大学,2015.
[11]中华人民共和国建设部.土工试验方法标准:GB/T 50123—1999[S].北京:中国计划出版社,2015:37-55.
[12]中华人民共和国建设部.土的工程分类标准:GB/T 50145—2007[S].北京:中国计划出版社,2013:8-13.
[13]中华人民共和国交通运输部.公路路基设计规范:JTG D30-2015[S].北京:人民交通出版社,2013:6-12.
[14]杨晶.黄土状压实填土压缩和强度特性研究[D].太原:太原理工大学,2014.