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隧道建设(中英文) ›› 2017, Vol. 37 ›› Issue (2): 174-178.DOI: 10.3973/j.issn.1672-741X.2017.02.008

• 研究与探索 • 上一篇    下一篇

盾构管片在不同pH值水养下质量研究

曾锋1, 宋天田1, 2, 苏华友1,*   

  1. (1. 西南科技大学, 四川 绵阳 621000; 2. 深圳市地铁集团有限公司, 广东 深圳 518000)
  • 收稿日期:2016-09-18 修回日期:2016-11-14 出版日期:2017-02-20 发布日期:2017-03-04
  • 作者简介:曾锋(1989—),男,河南信阳人,西南科技大学安全工程专业在读硕士,主要研究方向为盾构隧道建设。Email: 946910815@qq.com。*通讯作者: 苏华友,Email: suhy@swust.edu.cn。

Study of Curing Quality of Shield Segment in Water with  Different pH Values

ZENG Feng1, SONG Tiantian1, 2, SU Huayou1,*   

  1. (1. Southwest University of Science and Technology, Mianyang 621000, Sichuan, China;  2. Shenzhen Metro Group Co., Ltd., Shenzhen 518000, Guangdong, China)
  • Received:2016-09-18 Revised:2016-11-14 Online:2017-02-20 Published:2017-03-04

摘要:

原材料控制、混凝土配合比、模具结构以及人工操作的熟练程度是影响盾构管片质量的主要因素,实践表明水养池中水的pH值对其也有一定的影响。为了得到养护水最佳pH值,取一定数量同期生产的管片和试块,均分为6组,分别在pH值为7、8、9、10、11、12的水中养护7 d,达到龄期28 d后,观察各组管片和试块的外观颜色,并对其做抗压和抗渗实验。结果表明: 1)随着养护水的pH值变大,管片的外观颜色由灰白色变成浅黑色,抗压和抗渗强度逐渐变小; 2)当pH值在7~10时,管片颜色正常,抗压和抗渗强度变化较小; 3)当pH>10时,管片颜色变为浅黑色,抗压和抗渗强度急剧变小。因此,养护水的pH值合理范围可设为 7~10。

关键词: 武汉地铁, 盾构管片, 管片外观颜色, 抗压强度, 抗渗强度, 养护水, pH值

Abstract:

The raw material control, concrete mixing proportions and skilled level of manual operation are the main factors for quality of shield segment manufacturing. The practice shows that the pH value of curing water also has some influence on it. In order to obtain the optimal pH value of segment curing water, segments and test pieces produced at a same time are divided into 6 groups and cured for 7 days in water with pH values of 7, 8, 9, 10, 11 and 12. After 28 days, the colour of the appearance of segments and test pieces are observed; and then the compressive test and antipermeability test are carried out. The results show that: 1) The colour of segment appearance darkened (from gray to dark) and the compressive strength and antipermeability strength of segment decrease as pH value of segment curing water increases. 2) The colour of segment appearance remains original and the compressive strength and antipermeability strength of segment vary little under the pH value of 7-10 of the segment curing water. 3) The colour of segment appearance darkened and the compressive strength and antipermeability strength of segment decrease rapidly under the pH value of segment curing water larger than 10. Thereby, the rational pH value range of segment curing water is 7-10. 

Key words: Wuhan Metro, shield segment, colour of segment appearance, compressive strength, antipermeability strength, curing water, pH value

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