img

官方微信

img

群号:冰川冻土交流群

QQ群:218834310

高级检索

冰川冻土

• 冰冻圈变化 •    下一篇

钻孔埋管注盐法整治季节性冻土区路基冻害现场试验研究

王彦虎,王旭,张延杰   

  1. 兰州交通大学
  • 收稿日期:2017-04-24 修回日期:2017-08-09 出版日期:2018-03-09
  • 基金资助:
     

Field Test Study on remedying Frost Damage of Subgrade in the Seasonal Frozen Soil Area by Drilling and Injecting salt

    

  1.  
  • Received:2017-04-24 Revised:2017-08-09 Online:2018-03-09
  • Supported by:
     

摘要: 以季节性冻土区青藏铁路环青海湖段路基冻害为背景,通过选取典型冻害断面,从水分、温度和土体三个方面分析了环湖段路基冻害成因。根据路基病害处理中成熟应用的注浆和注盐法,提出采用钻孔埋管注盐法整治路基病害技术,通过现场冻胀观测,检验注盐法整治路基的有效性。结果表明:环湖段路基冻害主要是由于路基土体内存在一层低液限低渗透性的粉质粘土,粘粒含量高,含水率大,冻深最大为1.5米,粉质黏土层冻结,引起路基冻胀。结合现场试验段,对用盐量、盐的成分、施工工艺与参数提出合理的施工建议。现场冻胀监测表明,钻孔埋管注盐段路基的冻胀量明显降低,可用于季节性冻土区路基冻害的整治治理。

Abstract: Based on the frost damage of Qinghai Lake section of the Qinghai - Tibet Railway, this paper analyzes the causes of frost damage of the subgrade from three aspects, namely, water, temperature and soil by selecting the typical frost damage section in the seasonal frozen soil area. According to the grouting and salt injection method applied maturely in the treatment of subgrade disease, the method of remedying subgrade disease by drilling and injecting salt has been put forward in this paper. Furthermore, the effectiveness of this method can be tested by observing field frost heave. The results show that the damage of the subgrade of the lake section is mainly due to the existence of a layer of low-liquid and low-permeability silty clay in the subgrade soil, the clay content and water content of which is high with the maximum depth of 1.5 meters, the freezing of silty clay causes the subgrade to freeze. Combined with the site test, reasonable construction suggestions on the amount of salt and its composition, construction technology and parameters have been proposed. On-site frost heave monitoring shows that the amount of frost heave of the road section which has been drilled and injected salt is significantly reduced. Thus, it can be used for remediation of the frost damage of subgrade in the seasonal frozen soil area.

中图分类号: 

  • TU43