青藏直流输电线路冻土长期抗剪强度预测及影响因素分析

黄元生 李鹏 严福章 王彦兵 程东幸

黄元生, 李鹏, 严福章, 王彦兵, 程东幸. 2014: 青藏直流输电线路冻土长期抗剪强度预测及影响因素分析. 工程地质学报, 22(3): 507-514. doi: 10.13544/j.cnki.jeg.2014.03.021
引用本文: 黄元生, 李鹏, 严福章, 王彦兵, 程东幸. 2014: 青藏直流输电线路冻土长期抗剪强度预测及影响因素分析. 工程地质学报, 22(3): 507-514. doi: 10.13544/j.cnki.jeg.2014.03.021
HUANG Yuansheng, LI Peng, YAN Fuzhang, WANG Yanbing, CHENG Dongxing. 2014: ANALYSIS AND PREDICTION ON LONG-TERM SHEAR STRENGTH OF FROZEN SOIL AND ITS INFLUENCE FACTORS ALONG QINGHAI-TIBET DC TRANSMISSION LINE. JOURNAL OF ENGINEERING GEOLOGY, 22(3): 507-514. doi: 10.13544/j.cnki.jeg.2014.03.021
Citation: HUANG Yuansheng, LI Peng, YAN Fuzhang, WANG Yanbing, CHENG Dongxing. 2014: ANALYSIS AND PREDICTION ON LONG-TERM SHEAR STRENGTH OF FROZEN SOIL AND ITS INFLUENCE FACTORS ALONG QINGHAI-TIBET DC TRANSMISSION LINE. JOURNAL OF ENGINEERING GEOLOGY, 22(3): 507-514. doi: 10.13544/j.cnki.jeg.2014.03.021

青藏直流输电线路冻土长期抗剪强度预测及影响因素分析

doi: 10.13544/j.cnki.jeg.2014.03.021
详细信息
    作者简介:

    黄元生,男,博士,教授,研究方向为技术经济及管理、产业经济学.Email:hys2656@aliyun.com

  • 中图分类号: TU457;P642.22

ANALYSIS AND PREDICTION ON LONG-TERM SHEAR STRENGTH OF FROZEN SOIL AND ITS INFLUENCE FACTORS ALONG QINGHAI-TIBET DC TRANSMISSION LINE

  • 摘要: 冻土是指0℃以下,含有冰的各种岩石和土壤,由于其复杂的物理力学特性,给青藏直流联网工程的施工和设计带来了很多难题。工程沿线冻土的长期抗剪强度,更是由于土质、含冰量以及密实度分布的复杂特性,影响了其在使用寿命内的安全运营和稳定性。为解决这一工程难题,室内制备重塑试样并在-2℃的温度下对3种土质类型(粉质黏土、粉砂和细砂)、3种含冰量(饱冰、富冰和多冰)的密实和松散冻土进行直剪快剪的蠕变试验,得到了不同土质、含冰量以及密实度类型的冻土剪切蠕变特性,并分析和预测了长期抗剪强度的变化规律和影响因素,结果表明:(1)短时间内冻土承受荷载的能力随含冰量的增加而增大;随着加载时间的延长,冰的流变特性表现出来,使冻土的蠕变变形加大,冻土的强度降低;(2)密实度越大、含冰量越大的冻土,初期强度越高;随着时间的增加,强度开始衰减,且含冰量越大,密实度越小的冻土衰减速度越快;(3)长期强度的变化规律不受土质的影响,说明在工程施工阶段,若单纯考虑长期强度时,只要不同土质冻土保持冻结状态,可同一对待和处理。以上结论为输电线路冻土基础设计、施工和安全运营提供了一定的理论基础,也为在青藏地区开展的其他工程活动提供了可借鉴的试验数据和资料。
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  • 收稿日期:  2014-01-23
  • 修回日期:  2014-05-06
  • 刊出日期:  2014-06-25

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