穿越粉煤灰沉淀池场区高速公路路基处理方法
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摘要
为研究穿越粉煤灰沉淀池场区的某高速公路路基处理效果,通过室内试验和现场试验研究了粉煤灰场区的工程性状和承载特性,并对粉煤灰用于路床填筑材料时的施工配合比进行了研究。结果表明,粉煤灰孔隙比大,黏聚力低,渗水性较好,适宜采用强夯法加固处理。强夯法加固处理后粉煤灰沉淀池场区最大压实度可达93%,其承载力特征值约为加固前场区承载力特征值的1. 9倍。粉煤灰填筑路床区时,采用粉煤灰∶黏性土为7∶3,外掺水泥为5%的配合比作为施工配合比,可满足粉煤灰路堤压实度96%以上的要求。
In order to analyze the treatment method of a highway roadbed crossing fly ash settling basin,engineering properties and bearing capacity of fly ash used as highway roadbed were analyzed using laboratory and field testing,and mix ratio of fly ash used as embankment filling was also researched. The analyses showed that fly ash had big void ratio,low cohesion and high permeability,and could be consolidated with dynamic compaction method. The maximum degree of compaction of fly ash treated with dynamic compaction method was about 93%,and the characteristic value of bearing capacity of fly ash treated with dynamic compaction method was about 1. 9 times that of fly ash without any treatment. As to the fly ash used as embankment filling,the ratio of fly ash to clay was adopted as 7∶ 3,and the cement content was designed as 5%,which was satisfy the requirements of over 96% degree of compaction of embankment.
In order to analyze the treatment method of a highway roadbed crossing fly ash settling basin,engineering properties and bearing capacity of fly ash used as highway roadbed were analyzed using laboratory and field testing,and mix ratio of fly ash used as embankment filling was also researched. The analyses showed that fly ash had big void ratio,low cohesion and high permeability,and could be consolidated with dynamic compaction method. The maximum degree of compaction of fly ash treated with dynamic compaction method was about 93%,and the characteristic value of bearing capacity of fly ash treated with dynamic compaction method was about 1. 9 times that of fly ash without any treatment. As to the fly ash used as embankment filling,the ratio of fly ash to clay was adopted as 7∶ 3,and the cement content was designed as 5%,which was satisfy the requirements of over 96% degree of compaction of embankment.
引文
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10 张留俊,王福胜,李刚.公路地基处理设计施工实用技术[M].北京:人民交通出版社,2008Zhang Liujun,Wang Fusheng,Li Gang. Practical technique for design and construction of highway foundation treatment[M]. Beijing:China Communications Press,2008
11 《工程地质手册》编委会.工程地质手册[M].北京:中国建筑工业出版社,2007Editor Committee of Handbook of Engineering Geology. Handbook of engineering geology[M]. Beijing:China Architecture and Building Press,2007
2 崔伟,郑晓.高速公路粉煤灰沉淀池场区地基加固技术研究[J].科学技术与工程,2017,17(5):302-306Cui Wei,Zheng Xiao. Study on reinforcement technique of embankment of highway crossing area of fly ash settling basin[J]. Science Technology and Engineering,2017,17(5):302-306
3 庄心善,彭伟珂,吴镜泊.粉煤灰改良膨胀土脱湿过程裂隙发展规律与影响因素研究[J].科学技术与工程,2017,17(6):252-258Zhuang Xinshan,Peng Weike,Wu Jingbo. Study of cracking characteristics and influencing factors for flyash-treated expansive soil in dehydration process[J]. Science Technology and Engineering,2017,17(6):252-258
4 隋淑梅,海龙,曾瑞萍.粉煤灰的路用土工性质试验分析[J].材料科学与工程学报,2017,35(2):278-283Sui Shumei,Hai Long,Zeng Ruiping. Test analysis of the fly ash's geotechnical properties for road use[J]. Journal of Materials Science and Engineering,2017,35(2):278-283
5 交通部公路科学研究院.公路土工试验规程:JTG E40—2007[S].北京:人民交通出版社,2007Research Institute of Highway Ministry of Transport. Test methods of soils for highway engineering:JTG E40—2007[S]. Beijing:China Communications Press,2007
6 张乾青,张忠苗,王华强.浙江某工业园区强夯法处理地基的事故分析[J].岩石力学与工程学报,2011,30(增刊1):3217-3223Zhang Qianqing,Zhang Zhongmiao,Wang Huaqiang. Accident analysis of dynamic compaction in ground improvement of an industrial park in Zhejiang Province[J]. Chinese Journal of Rock Mechanics and Engineering,2011,30(S1):3217-3223
7 李向群,李宗效,周彬.强夯法在加固公路路基中的应用探讨[J].吉林建筑大学学报,2015,32(2):31-35Li Xiangqun,Li Zongxiao,Zhou Bin. Dynamic compaction of the reinforcement mechanism and its application in a highway[J]. Journal of Jilin Jianzhu University,2015,32(2):31-35
8 张宏博,厉超,吴建清.地下水位对地基强夯加固效果影响现场试验[J].公路,2015(3):14-19Zhang Hongbo,Li Chao,Wu Jianqing. Field tests of effects of underground water level on dynamic consolidation[J]. Highway,2015(3):14-19
9 侯宏伟,钱志华,唐绍明.水位降深对真空降水联合强夯处理公路地基的影响研究[J].土工基础,2017,31(1):20-24Hou Hongwei,Qian Zhihua,Tang Shaoming. Drawdown effect in the dynamic compaction combined with the vacuum dewatering in the ground improvements for a highway project[J]. Soil Engineering and Foundation,2017,31(1):20-24
10 张留俊,王福胜,李刚.公路地基处理设计施工实用技术[M].北京:人民交通出版社,2008Zhang Liujun,Wang Fusheng,Li Gang. Practical technique for design and construction of highway foundation treatment[M]. Beijing:China Communications Press,2008
11 《工程地质手册》编委会.工程地质手册[M].北京:中国建筑工业出版社,2007Editor Committee of Handbook of Engineering Geology. Handbook of engineering geology[M]. Beijing:China Architecture and Building Press,2007