拉力型锚索锚固段周边岩体的应力分布

采用弹性空间体内部一点受集中力的Kelvin解，推导了拉力型锚索锚固段的附加应力和位移分布的理论公式，并依此推出了锚固段周边的剪应力分布公式。在此基础上，讨论了锚固体、岩土体的力学参数对附加应力、位移和剪应力的影响。结果表明，锚固段周边岩体中的正应力场和位移为锥形，在锚固段的起始点上部形成了压应力场，下部为拉应力场，并以力的作用点为中心快速衰减。锚固段周边剪应力形成了一个锥面，并随远离作用点快速衰减。

Stress distribution in rock mass around pull-type cable anchorage segment

Based on the Kelvin formula of elastic space solid bearing the concentrating force interiority, the theoretical solutions of the extra-stresses and displacement distribution of the pull-type cable anchorage segment are derived. Subsequently, the distributing formula of shearing stress around the anchorage segment is obtained. Therefore, the influences of mechanical characteristics of the anchorage segment and the rock mass on the extra-stresses, displacements and shearing stresses are discussed. The results show that the field of the normal stresses and displacements around the anchorage segment are tapered. The stresses up the origin of the anchorage segment are compression ones, and those below the origin are tension ones. They are decrease very fast from the origin. The shearing stresses around the anchorage segment form a taper surface and decrease very fast.