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以非线性统一强度理论为基础,充分考虑岩体的中间主应力效应和岩体强度的非线性特性,并结合锚索的破裂面形状和极限平衡原理,获得了一个应用于地下硐室的预应力锚索极限承载力的计算公式。该公式能综合考虑岩土体种类、无侧限抗压强度、锚索倾角和注浆压力等各方面因素对锚索极限抗拔力的影响。最后给出了一个计算实例。结果表明,计算得出的锚索极限抗拔力大于传统设计应力,与实际工程更为接近,可充分发挥材料的强度潜能;随着中间主应力影响系数的增大,锚索的破裂面临界高度基本不变,而其极限抗拔力非线性增长;随着注浆压力的增大,锚索的破裂面的临界高度和极限抗拔力都呈线性增长。
Based on the nonlinear unified strength theory, considering the intermediate principal stress effect of rock mass and the nonlinear characteristic of rock mass strength, combined with the fracture surface shape and limit equilibrium principle of anchor cable, Calculation formula of ultimate load carrying capacity of stress. The formula can comprehensively consider the influence of various factors such as rock mass type, unconfined compressive strength, anchor inclination and grouting pressure on the ultimate pull-out force of the anchor cable. Finally, a calculation example is given. The results show that the calculated ultimate tensile strength of anchor is larger than the traditional design stress, which is close to the actual project, which can give full play to the strength potential of the material. With the increase of the influence coefficient of middle principal stress, While the ultimate pullout force increases non-linearly. With the increase of grouting pressure, the critical height and the ultimate pullout force of the rupture face of the anchor rope increase linearly.