有预张力的粘结式锚杆
Cohesive Anchored Bolt with Pretension
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摘要: 在地下工程和边坡工程中,广泛采用有预张力的粘结式锚杆加固岩体。粘结剂固化后,除去加力装置,锚杆回缩。锚杆靠粘结剂向岩体传递剪力,在围岩中形成附加应力场,并引起锚杆自身不均匀变形。 本文根据锚杆和岩休的力学边界条件、几何条件,视锚杆和岩体为弹性体,利用明德林(Mindlin)解,得到了去掉预张力后,锚杆回缩在岩体中产生的应力场和锚杆自身应力分布的规律。 在解题过程中引用了由R.米开(R.Muki)和E.斯特恩白格(E.Sternberg)导出的柱状空间内的明德林积分解。Abstract: The anchored bolt with pretension is extensively used in underground and slope structures. When the coherent material has been solidified and the force device removed, the anehored bolt contraets. Meanwhile, shear stress is transfered from the anchored bolt to the rock mass around it through the coherent material. An additional stress field is produced in the surrounding rock mass and uneven deformation is caused in the anchored bolt.With the anchored bolts and the rock regarded as elastic, their mechanical boundary condition, geometry considered, this paper gives the stress distribution caused by anchored bolt contraction in rock mass and that within the bolt.This paper has used the Mindlin integral solution within the columnar space derived by R. Muki and E. Sternberg in the course of solving the problem.