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岩石锚杆基础作为风电机组基础的一种特殊基础型式,可以充分发挥原状岩体的力学性能,具有良好的抗拔性能。已有研究表明,小而非零拉伸截断改进的Mohr-Coulomb(简称M-C)强度准则更适用于描述岩体的破坏特性。基于小而非零拉伸截断改进的M-C强度准则,建立破坏面上单位面积的能量耗损率表达式。从塑性力学极限分析上限定理出发,构建岩楔体平移破坏机构。根据外部作用荷载和岩楔体自重所做的外功率与沿岩楔体圆破坏锥面的能量耗损率相等的条件,建立虚功率方程,并由此得到了岩石锚杆极限抗拔承载力的计算公式。经原型试验验证,推导公式所得计算值与实测值一致性较好,具有一定的可靠性,且能满足工程实际应用要求。
As a special foundation of wind turbine foundation, rock bolt foundation can give full play to mechanical properties of intact rock mass and has good anti-pull performance. It has been shown that the improved Mohr-Coulomb (M-C) strength criterion for small but not zero stretch truncation is more suitable for describing the failure characteristics of rock mass. Based on the improved M-C strength criterion of small but not zero-stretch truncation, an expression of energy loss rate per unit area of destructive plane was established. Based on the upper bound theorem of plastic mechanics limit analysis, a rock wedge translational failure mechanism is constructed. The virtual power equation is established according to the external power and the wedging wedge body’s external energy equal to the energy loss rate along the wedge body’s circular rupturing cone. The ultimate pull-out bearing capacity of the rock bolt is obtained Calculation formula. The prototype test shows that the calculated value derived from the formula is in good agreement with the measured value, has certain reliability and can meet the practical application requirements of the project.