Article(id=1222925287684297447, tenantId=1146029695717560320, journalId=1205116964453384197, issueId=1222925278838513745, articleNumber=null, orderNo=null, doi=10.20040/j.cnki.1000-7709.2023.20220292, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1645200000000, receivedDateStr=2022-02-19, revisedDate=1648396800000, revisedDateStr=2022-03-28, acceptedDate=null, acceptedDateStr=null, onlineDate=1769497709437, onlineDateStr=2026-01-27, pubDate=1677254400000, pubDateStr=2023-02-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1769497709437, onlineIssueDateStr=2026-01-27, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1769497709437, creator=13701087609, updateTime=1769497709437, updator=13701087609, issue=Issue{id=1222925278838513745, tenantId=1146029695717560320, journalId=1205116964453384197, year='2023', volume='41', issue='2', pageStart='1', pageEnd='220', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1769497707328, creator=13701087609, updateTime=1769497707328, updator=13701087609, preIssue=null, nextIssue=null, ext=null, issueFiles=null}, startPage=177, endPage=181, ext={EN=ArticleExt(id=1222925288397329178, articleId=1222925287684297447, tenantId=1146029695717560320, journalId=1205116964453384197, language=EN, title=Influence of Delay Effect on Engineering Characteristics of Cement Improved Silty Fine Sand, columnId=1222925283779400191, journalTitle=Water Resources and Power, columnName=WATER CONSERVANCY AND HYDROPOWER ENGINEERING, runingTitle=null, highlight=null, articleAbstract=

In view of the problem that the compaction coefficient of cement improved silty fine sand road in Gobi area is difficult to meet the standard after the completion of rolling inspection as an engineering material, after comprehensive analysis, it is found that the timeliness of cement improved silty fine sand is not considered in on-site construction and inspection. Through the design of compaction test and unconfined compression test of cement improved silty fine sand under different delay time, the influence of delay time on the compaction characteristics and strength characteristics of cement modified silty fine sand was analyzed. Considering the strength change of Subgrade in seasonally frozen area after freeze-thaw cycle, the freeze-thaw cycle test of cement modified silty fine sand under the influence of delay time was designed. The results show that with the increase of delay time, the maximum dry density of cement modified silty fine sand first increases and then decreases, and the optimal water content first increases, then tends to be flat and then increases; The saturated 7 d unconfined compressive strength and the strength after freeze-thaw cycle decreased gradually with the increase of delay time; The structure formed by cement hydration inside admixture has been destroyed after being rolled and formed, reducing the cement effectiveness.

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针对戈壁地区水泥改良粉细砂作为工程材料碾压结束检测后压实系数难以达标的问题,综合分析后发现现场施工及检测未考虑水泥改良粉细砂的时效性,通过设计不同延迟时间下水泥改良粉细砂的击实试验及无侧限抗压试验,分析延迟时间对水泥改良粉细砂击实特性及强度特性的影响。同时考虑季冻区路基经受冻融循环后强度变化,设计在延迟时间影响下水泥改良粉细砂的冻融循环试验。结果表明,随着延迟时间的增大,水泥改良粉细砂的最大干密度先增大后减小,最优含水率先增大后趋于平缓再增大;饱和7 d无侧限抗压强度和冻融循环后强度均随延迟时间的增大逐渐减小;掺和料内部水泥水化形成的结构在经历碾压成型后已受到破坏,降低了水泥效力。

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黄志军(1971-),男,博士、副教授,研究方向为岩土工程,E-mail:
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陈伟(1997-),男,硕士研究生,研究方向为岩土工程,E-mail:

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陈伟(1997-),男,硕士研究生,研究方向为岩土工程,E-mail:

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陈伟(1997-),男,硕士研究生,研究方向为岩土工程,E-mail:

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延迟效应对水泥改良粉细砂工程特性的影响分析
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陈伟 1 , 黄志军 1 , 赵尔升 2
水电能源科学 | 水利水电工程 2023,41(2): 177-181
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水电能源科学 | 水利水电工程 2023, 41(2): 177-181
延迟效应对水泥改良粉细砂工程特性的影响分析
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陈伟1 , 黄志军1 , 赵尔升2
作者信息
  • 1.兰州交通大学土木工程学院,甘肃 兰州 730000
  • 2.兰州铁道设计院有限公司,甘肃 兰州 730000
  • 陈伟(1997-),男,硕士研究生,研究方向为岩土工程,E-mail:

通讯作者:

黄志军(1971-),男,博士、副教授,研究方向为岩土工程,E-mail:
Influence of Delay Effect on Engineering Characteristics of Cement Improved Silty Fine Sand
Wei CHEN1 , Zhi-jun HUANG1 , Er-sheng ZHAO2
Affiliations
  • 1.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730000, China
  • 2.Lanzhou Railway Design Institute Co., Ltd., Lanzhou 730000, China
出版时间: 2023-02-25 doi: 10.20040/j.cnki.1000-7709.2023.20220292
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针对戈壁地区水泥改良粉细砂作为工程材料碾压结束检测后压实系数难以达标的问题,综合分析后发现现场施工及检测未考虑水泥改良粉细砂的时效性,通过设计不同延迟时间下水泥改良粉细砂的击实试验及无侧限抗压试验,分析延迟时间对水泥改良粉细砂击实特性及强度特性的影响。同时考虑季冻区路基经受冻融循环后强度变化,设计在延迟时间影响下水泥改良粉细砂的冻融循环试验。结果表明,随着延迟时间的增大,水泥改良粉细砂的最大干密度先增大后减小,最优含水率先增大后趋于平缓再增大;饱和7 d无侧限抗压强度和冻融循环后强度均随延迟时间的增大逐渐减小;掺和料内部水泥水化形成的结构在经历碾压成型后已受到破坏,降低了水泥效力。

粉细砂  /  强度  /  延迟时间  /  冻融循环  /  试验研究

In view of the problem that the compaction coefficient of cement improved silty fine sand road in Gobi area is difficult to meet the standard after the completion of rolling inspection as an engineering material, after comprehensive analysis, it is found that the timeliness of cement improved silty fine sand is not considered in on-site construction and inspection. Through the design of compaction test and unconfined compression test of cement improved silty fine sand under different delay time, the influence of delay time on the compaction characteristics and strength characteristics of cement modified silty fine sand was analyzed. Considering the strength change of Subgrade in seasonally frozen area after freeze-thaw cycle, the freeze-thaw cycle test of cement modified silty fine sand under the influence of delay time was designed. The results show that with the increase of delay time, the maximum dry density of cement modified silty fine sand first increases and then decreases, and the optimal water content first increases, then tends to be flat and then increases; The saturated 7 d unconfined compressive strength and the strength after freeze-thaw cycle decreased gradually with the increase of delay time; The structure formed by cement hydration inside admixture has been destroyed after being rolled and formed, reducing the cement effectiveness.

silty fine sand  /  strength  /  delay time  /  freeze thaw cycle  /  experimental study
陈伟, 黄志军, 赵尔升. 延迟效应对水泥改良粉细砂工程特性的影响分析. 水电能源科学, 2023 , 41 (2) : 177 -181 . DOI: 10.20040/j.cnki.1000-7709.2023.20220292
Wei CHEN, Zhi-jun HUANG, Er-sheng ZHAO. Influence of Delay Effect on Engineering Characteristics of Cement Improved Silty Fine Sand[J]. Water Resources and Power, 2023 , 41 (2) : 177 -181 . DOI: 10.20040/j.cnki.1000-7709.2023.20220292
  • 甘肃省自然基金项目(148RJZA042)
2023年第41卷第2期
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doi: 10.20040/j.cnki.1000-7709.2023.20220292
  • 接收时间:2022-02-19
  • 首发时间:2026-01-27
  • 出版时间:2023-02-25
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  • 收稿日期:2022-02-19
  • 修回日期:2022-03-28
基金
甘肃省自然基金项目(148RJZA042)
作者信息
    1.兰州交通大学土木工程学院,甘肃 兰州 730000
    2.兰州铁道设计院有限公司,甘肃 兰州 730000

通讯作者:

黄志军(1971-),男,博士、副教授,研究方向为岩土工程,E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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