Failure analysis of soil anchors induced by loose interface under pullout load
Failure analysis of soil anchors induced by loose interface under pullout load
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发表时间：
2012
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通讯作者：
Ren Zhi-hua
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作者：
Ren Zhi-hua
根据界面粘滑本构模型的假设和剪切位移法的基本原理，推导了土层锚杆临界松动拉拔荷载的理论计算公式和锚杆拉拔荷载与松动长度的内在关系式。锚杆剪应力的重新分布是由于界面的粘滑性质引起的，荷载传递到锚固系统的远端，加剧了内部锚杆的劣化。基于界面抗剪强度与残余强度的大小关系，提出了一种基于界面抗剪强度与残余强度之间的关系的锚杆抗剪强度计算方法。将土层锚杆的破坏类型分为渐进型和突破型，提出了锚杆拔出破坏的极限荷载判别准则和理论解。最后，根据锚杆拔出试验数据，通过计算和对比分析，验证了该方法的可行性。
According to the presumption of the interface stick-slip constitutive model and the fundamental principles of the shear displacement method,a theoretical formula for the critical loose pullout load of soil anchors and an inherent relationship formula between anchor pullout load and loose length are derived.The redistribution of anchor shear stress is caused by stick-slip properties of the interface,and the loading is transmitted to the remote end of anchorage system,which aggravates the deterioration of interior anchor.Based on the size relationship between interface shear strength and residual strength,the failure types of soil anchors can be divided into progressive and bursting ones.The discriminant criterion and the theoretical solution to the ultimate load in accordance with the failure of anchor pullout are proposed.Finally,based on the data of anchor pullout tests,the feasibility of the proposed method is verified through calculation and comparative analysis.