铁道标准设计2024，Vol.68Issue(3)：49-55,7.DOI:10.13238/j.issn.1004-2954.202208060002
拉林铁路沿线风积沙自由场及其加固地基动力特性分析
Dynamic Characteristics Analysis on Free Field and its Reinforced Foundation of Aeolian Sand along Lhasa-Nyingchi Railway
摘要
Abstract
Liquefaction foundation of aeolian sand is one of the primary problems along Lhasa-Nyingchi Railway,and a series of problems are found such as large local settlement where vibroflotation gravel pile method is used for foundation treatment.To solve the above problems,the dynamic response characteristics on free field and cement mixing pile reinforced foundation in aeolian sand in the study area are analyzed using shaking table test.The results show that the ground motion in the free field of aeolian sand has an obvious increasing trend from bottom to top as the earthquake intensity is relatively small(0.1g),and it increases first and then decreases in the soil layer from bottom to top as the earthquake intensity is relatively large(0.3g).The liquefaction phenomenon in the free field of aeolian sand does not occur simultaneously,but has obvious time difference,i.e.,it develops gradually from top to bottom.When the input ground motion intensity is constant,the surface subsidence and pore pressure ratio on free field of aeolian sand are significantly greater than that of cement mixing pile reinforcing foundation,and surface macroscopic response of the former is much stronger than the latter,implying that the cement mixing pile has a good inhibition effect on the liquefaction of aeolian sand foundation.The inhibition effect is negatively correlated with the ground motion intensity,but positively correlated with the buried depth of soil layer.The research results can provide reference for the liquefaction treatment of aeolian sand foundation.关键词
拉林铁路/风积沙/地基液化/水泥搅拌桩/振动台试验Key words
Lhasa-Nyingchi Railway/wind-blown sand/foundation liquefaction/cement mixing pile/shaking table test分类
交通工程引用本文复制引用
薛春晓..拉林铁路沿线风积沙自由场及其加固地基动力特性分析[J].铁道标准设计,2024,68(3):49-55,7.基金项目
中国中铁股份有限公司重点科研项目(2018-重点-45) （2018-重点-45）
中铁科学研究院有限公司科研项目(中铁科研院(科研)字2018-KJ008-Z008-XB) （中铁科研院(科研）
