弹性状态下锚杆位移变形分析

将锚杆拉拔位移分解成自由段的弹性变形、锚固段的拉伸变形和锚固段与土体之间的相对剪切位移。分析锚杆自由段长度、锚固段长度、锚杆体截面积、浆体强度、锚杆孔径及土层剪切模量与锚杆弹性模量的比值等因素对锚杆位移的影响。在此基础上,假定锚固段与其周围土体之间的剪应力与剪切位移呈线性递增关系、锚固段所受的轴力呈抛物线分布,建立锚杆荷载与位移之间的关系式。

Analysis of Displacement and Deformation of Anchor Bolt under Elastic State

The pulling displacement of the anchor bolt is broken down into the elastic deformation of the free segment, the tensile deformation of the anchored segment and the relative shear displacement between the bolt and soil. Factors affecting the displacement of anchor bolt are analyzed, such as free segment length of the anchor bolt, the length of the anchored segment, the section area of the anchor bolt, strength of concrete, bore diameter of anchor bolt, shear modulus of soil and elastic modulus of the anchor bolt, etc. On this basis, on the supposition that the shear stress increases by degrees with shear displacement linearly between the bolt and surrounding soil, the axis force acting on the bolt distributes in the form of a parabola, relational expression between the load and the displacement of the anchor bolt is established.