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冰川冻土 ›› 2019, Vol. 41 ›› Issue (1): 140-146.doi: 10.7522/j.issn.1000-0240.2019.0053

• 寒区科学与技术 • 上一篇    

离子类土壤固化剂对高温冻土工程性质改良试验研究

张致龙1,2,3, 张建明2, 张虎2, 柴明堂2,3   

  1. 1. 新疆大学 建筑工程学院, 新疆 乌鲁木齐 830046;
    2. 中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室, 甘肃 兰州 730000;
    3. 中国科学院大学, 北京 100049
  • 收稿日期:2017-03-11 修回日期:2018-10-22 发布日期:2019-03-16
  • 通讯作者: 张建明。E-mail:zhangjm@lzb.ac.cn E-mail:zhangjm@lzb.ac.cn
  • 作者简介:张致龙(1978-),男,甘肃兰州人,讲师,2018年在中国科学院西北生态环境资源研究院获博士学位,从事冻土力学与寒区工程研究.E-mail:573289332@qq.com
  • 基金资助:
    国家自然科学基金项目(41471062;41401087);冻土工程国家重点实验室自主研究项目(SKLFSE-ZT-06)资助

Experimental study of the engineering properties of warm frozen soil treated with ionic soil stabilizer (ISS)

ZHANG Zhilong1,2,3, ZHANG Jianming2, ZHANG Hu2, CHAI Mingtang2,3   

  1. 1. College of Civil Engineering and Architecture, Xinjiang University, Urumqi 830046, China;
    2. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-03-11 Revised:2018-10-22 Published:2019-03-16

摘要: 为了研究离子类土壤固化剂对青藏高原高温冻土工程性质的改良效果,分别选用酸性和碱性离子类土壤固化剂对冻结青藏粉质黏土进行了改良测试。塑性指数测试表明,两种固化剂的最优含量为0.20%。固化剂含量小于0.30%时,冻结温度相对原状土样没有明显的下降。对不同含量碱性和酸性固化土力学性质进行了测试,无侧限单轴抗压强度相对原状土样整体增大,碱性和酸性固化土抗压强度最大分别提高了78.7%和46.6%,最优配比(0.20%)的碱性和酸性固化土体积压缩系数随养护龄期增大而减小,两种固化土的体积压缩系数相对原状土样最大分别下降了44.4%和27.8%,固化效果明显。碱性固化土力学性质变化更显著,说明碱性固化剂更适合对青藏黏土进行改良。

关键词: 离子类土壤固化剂, 塑性指数, 高温冻土, 体积压缩系数

Abstract: In this paper, it is focused on how to improve the engineering property of warm frozen soil on the Qinghai-Tibet Plateau by ionic soil stabilizer (ISS). The alkaline ISS and acidic ISS were chosen to improve mechanical properties of frozen silty clay. The optimal proportion of the improved soil specimen was determined by the test of the plasticity index. The maximum compressive strengths of the specimens treated with alkaline ISS and acidic ISS have increased by 78.7% and 46.6%, respectively. The coefficient of volumetric compression of the soil treated with optimal alkaline ISS and acidic ISS have decreased with conservation periods, with the coefficient of volumetric compression decreased by 44.4% and 27.8%, respectively, as compared with the undisturbed soil. One can see that the effect of cementation is obvious. Especially, the mechanics properties of the alkaline solidified soil have improved more significantly, showing that alkaline ISS is more suitable for the Tibetan clay to improve.

Key words: ionic soil stabilizer (ISS), plasticity index, warm frozen soil, coefficient of volumetric compression

中图分类号: 

  • TU472.5