基于改进的Mohr-Coulomb强度准则下岩石锚杆极限抗拔承载力计算

发布时间：2018-03-14 20:56

本文选题：小而非零拉伸截断　切入点：Mohr-Coulomb强度准则　出处：《岩土力学》2016年09期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:As a special foundation type of wind turbine foundation, rock bolt foundation can give full play to the mechanical properties of undisturbed rock mass and has good pull-out performance. The modified Mohr-Coulomb (M-C) strength criterion is more suitable for describing the failure characteristics of rock mass than zero tensile truncation. Based on the upper limit theorem of plastic mechanics limit analysis, the expression of energy loss rate per unit area on failure surface is established. According to the condition that the external power of the external load and the weight of the rock wedge is equal to the energy consumption rate of the cone along the rock wedge, the virtual power equation is established. The formula of ultimate uplift bearing capacity of rock anchor rod is obtained. The result of prototype test shows that the calculated value is in good agreement with the measured value and has certain reliability and can meet the requirements of engineering application.
【作者单位】：水能资源利用关键技术湖南省重点实验室;湖南科技大学岩土工程稳定控制与健康监测省重点实验室;
【基金】：国家自然科学基金资助项目(No.41272324) 水能资源利用关键技术湖南省重点实验室开放基金项目(No.PKLHD201309)~~
【分类号】：TU476

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