土工基础

›› 2012, Vol. 26 ›› Issue (1): 25-29.

• 工程实录 • 上一篇    下一篇

边坡开挖条件下锚索应力与变形特征分析

余子华，莫志柏，廖爱平，周 政   

  1. （湖南省电力勘测设计院，长沙 410007）
  • 收稿日期:2011-09-26 出版日期:2012-02-20 发布日期:2012-03-23
  • 作者简介:余子华，男，工程师。从事岩土工程勘测与设计工作。

Stress and Strain Characteristics of Ground Anchors on Cut Slopes

YU Zihua, MO Zhibai, LIAO Aiping, ZHOU Zheng   

  1. (Hunan Electric Power Design Institute, Changsha 410007)
  • Received:2011-09-26 Online:2012-02-20 Published:2012-03-23

摘要： 以某工程边坡为例，通过现场试验及岩土工程勘察方法，得到了各类地质参数和地质力学模型，然后结合现场锚索张拉试验成果对锚索及边坡边界条件进行数值模拟反算，讨论锚索应力及变形演化规律。结果表明：注浆体与岩体接触面的剪切应力在锚固段近端顶部附近达到最大值，然后向远端逐渐变小，在1.5 m附近变为零，其变化具有窄闭型抛物线特征，数值试验结果比理论弹性解要小。

关键词: 锚索, 边坡, 数值模拟, 应力和变形

Abstract: The case history of a cut slope in presented in this paper. The geologic and geotechnical parameters were obtained through test borings and insitu tests. The pullout tests on the ground anchors were performed and the stressstrain characteristics of the ground anchors were backanalyzed by the numerical analysis. The backanalysis results indicated that the maximum shear stress at the interface between the rock and the cement grout is at the top of the bond zone. It gradually reduced to zero at a distance of 1.5 m to the top of bond zone. The shape of the stress distribution is similar to a narrow parabola. A lower stress magnitude was found in the numerical analysis compared with the stress obtained from elastic closedform solution.

Key words: ground slope, cut slope, numerical simulations, stress strain characteristics