锚固体应力分布规律的数值模拟分析

Numerical simulation on stress distribution in anchorage body

采用非线性有限元法,分析了全长粘结式锚杆在荷载作用下剪应力的分布规律,同时研究了被加固岩土体的性质对锚固体剪应力分布规律的影响。并将数值模拟的结果与理论计算以及试验结果进行了对比分析。分析表明,锚固体剪应力的分布非常不均匀;当荷载不大时,锚杆所受的剪应力分布范围较小,而最大剪应力数值较大;随着荷载的加大,剪应力的分布范围有向下扩展的趋势,但扩展的速度比较慢;锚固体所受的剪应力的大小和分布与岩体性质有密切的关系,岩石越坚硬,剪应力分布越集中,最大剪应力的数值越大;而岩体越松软,剪应力分布就越均匀,最大剪应力的数值就越小。

The shear stress distribution of the wholly grouted bolt is analyzed by using a nonlinear finite element method;also the strengthened rock-soil body's properties are researched,which influence the anchorage body's shear stress distribution.Afterwards,a contrastive analysis is done among numerical simulation result,theoretical calculation and experimental result;it indicates that the shear stress distribution in the anchorage body is uneven.Under the small load,the bolt's shear stress distribution range is small but the maximum shear stress is large;with the increase of load,its distribution range tends to expand downwards with a slow speed.The shear stress and its distribution have a close relationship to reek-soil body's properties:the stiffer the rock,the more concentrated the shear stress and the larger the maximum shear stress;on the contrary,the evener the distribution and the smaller the maximum shear stress.