压力型和拉力型锚杆工作性能对比研究

An analysis of working performance of pressure-type and tensile-type anchor

通过压力型和拉力型锚杆各自的荷载传递模型,对比分析了岩层中压力型和拉力型锚杆的受力机制、摩阻力分布特征,并采用剪切变形系数与锚固体等效变形模量的比值衡量了锚杆的承载力和变形性能。压力型和拉力型锚杆现场试验和理论分析结果表明:岩层中压力型锚杆工作时,锚固体受压后径向体积膨胀,加大了锚固体与岩层间的摩阻力,α值相对较大,压力型锚杆承载能力和变形性能均优于拉力型锚杆,进而说明了采用剪切变形系数与锚固体等效变形模量的比值来衡量锚杆的承载力和变形是可行的,为压力型锚杆的进一步理论研究和工程应用提供了有益的参考。

Being separately establishment the load transfer mechanism of pressure-type anchor and tensile-type anchor, different shear stress of mechanisms and distributing behaviors between pressure-type anchor and tensile-type anchor were compared and analyzed, moreover, the bearing capacity and deformation characteristics of anchor were also measured with applying ratio of slip coefficient and equivalent anchoring body deformation modulus. Experimental and theoretical analysis result indicated that the volume of pressure-type anchor was expanded in radial direction, and the shear stress between the anchor and the rock stratum was amplified in consequence, which collaborative enhanced the bearing capacity and deformation characteristics of pressure-type anchor surrounding the vicinity rock mass. The result also suggested the working performance of pressure-type anchor was prior to tensile-type anchor. This manifested the feasibility of applying ratio of slip coefficient and equivalent anchoring body deformation modulus to evaluate the bearing capacity and deformation characteristics of anchor, which presented a method to study on working performance of pressure-type anchor.