季冻黄土地区框锚边坡预应力锚杆内力计算分析
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作者单位:

1.青海大学;2.青海省建筑节能材料与工程安全重点实验室

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青海省科技厅项目(2020-ZJ-718)


Calculation and analysis of internal forces of prestressed anchor on frame anchors supporting slope in the seasonal freeze-thaw loess area
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Affiliation:

1.Qinghai University;2.Qinghai Key Laboratory of building energy saving materials and engineering safety

Fund Project:

QingHai Depaetment of Science and Technology Project (No. 2020-ZJ-718)

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    摘要:

    因冻融土体与锚杆之间相互作用机理研究不足,导致工程实践中未能充分考虑土体冻融对锚杆内力的影响。针对该问题,基于西宁市季冻湿陷性黄土冻融循环三轴剪切试验,建立了考虑冻融次数影响的湿陷性黄土黏聚力经验关系式;根据锚固体与周围土层的变形协调关系,推导了冻融条件下框架预应力锚杆锚固段轴力和剪应力的解析式,将理论计算结果与现场试验结果进行对比验证,并分析了冻融次数对锚固段轴力和剪应力的影响。结果表明:随冻融次数的增加,土体黏聚力呈指数型下降,锚固段轴力和剪应力在前3次冻融循环中急剧增大,冻融次数达到7次后趋于稳定;锚固段始端轴力较锚固段末端轴力受冻融次数的影响更大,但锚固段始端至末端的剪应力随冻融次数的变化规律基本相同;现场试验结果验证了本文计算方法的合理性,可为此类地区框锚支护结构的设计与计算提供参考。

    Abstract:

    Due to insufficient research on the interaction mechanism between freeze-thaw soil and anchor, the influence of freeze-thaw of soil on the internal force of anchor cannot be fully considered in engineering practice. Therefore, building an empirical relationship of collapsible loess cohesion considering the influence of freeze-thaw cycles based on the triaxial shear test of freeze-thaw cycles of seasonal freeze-thaw collapsible loess in Xining City. Based on the deformation coordination relationship between the anchor body and the surrounding soil layer, the analytical formula of the axial force and shear stress of the anchorage section of the frame prestressed anchor under freeze-thaw conditions is deduced, and the results of the theoretical calculation are compared with the results of the field tests, and the influence of freeze-thaw cycles on the axial force and shear stress of the anchorage section is analyzed. The results show that the cohesion of the soil decreases exponentially with the increase of freeze-thaw cycles, and the axial force and shear stress of the anchorage section increase sharply in the first 3 freeze-thaw cycles, and then tend towards stable after 7 freeze-thaw cycles. The axial force at the beginning of the anchorage section is more influenced by freeze-thaw cycles than the axial force at the end of the anchorage section, however, the variation law of shear stress from the beginning to the end of the anchorage section with freeze-thaw cycles is same. Results of the field tests proved the rationality of the calculation method, which can provide a reference for the design and calculation of frame supporting structure in such areas.

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  • 收稿日期:2021-12-30
  • 最后修改日期:2022-03-03
  • 录用日期:2022-03-26
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