冻土区输电线路桩基础抗拔承载特性数值模拟研究

袁俊, 赵杰, 唐冲, 甘仁钧

Numerical analyses of uplift behavior of pile foundation for transmission line structure in frozen soil regions

Jun YUAN, Jie ZHAO, Chong TANG, Renjun GAN

表2 季节冻土区粉质黏土、砾砂地基中桩基础抗拔系数

Table 2 Anti-uplift coefficient for pile foundation in silty clay and gravelly sand in seasonally frozen soil regions

地基土 工况 活动层厚度/m 抗拔承载力/kN 抗压承载力/kN 抗拔系数λi 粉质黏土 融化期 — 1 267 1 782 0.71 冻结期 1.5 1 372 1 702 0.81 2.0 1 428 1 599 0.89 2.5 1 486 1 564 0.95 3.0 1 529 1 537 0.99 砾砂 融化期 — 1 369 2 570 0.53 冻结期 1.5 1 677 2 296 0.73 2.0 1 751 2 183 0.80 3.0 1 885 2 093 0.90 4.0 1 958 1 962 1.00