【摘要】 为揭示土遗址锚固系统中第二交界面黏结破坏机制,采用自主研制的依托压力试验机的第二交界面力学性能试验装置及试样制作装置,以孔壁粗糙度及注浆体配合比为变化参数,设计了两组共30个土体-浆体(CGN+C)界面试样进行室内推出试验。结果表明:锚固系统土体-浆体的荷载-滑移关系曲线具有明显的峰值强度;研究用各类浆体30 cm锚固长度可提供0.08～0.26 MPa(光滑孔壁)与0.26～0.46 MPa(螺纹孔壁)的抗剪强度,螺纹界面使抗剪强度最大提高了4.21倍;随烧料礓石掺和比的增大,两组试样抗剪强度值呈现的规律基本相同;光滑界面的剪滑曲线特征主要呈应变强化型,螺纹界面曲线特征主要呈应变软化型;界面剪应力-位移关系模型与试验结果拟合度较好。研究结论为土遗址锚固系统内部力学过程研究奠定理论基础。更多还原

【Abstract】 In order to reveal the cohesive failure mechanism of the second interface of anchor system in earthen sites, two groups of30 soil-grout interface samples are designed to carry push-out test in laboratory with different bore wall roughnesses and mixture ratios of grouting materials. The second interface properties are studied relying on the independently-developed pressure testing machine and sample preparation device. The results show that the load-slip relation curve has obvious peak strength. The 30 cm anchorage length can provide shear stresses of 0.08～0.26 MPa on smooth hole wall and 0.26～0.46 MPa on thread hole wall. The shear strength of the thread interface has increased by 4.21 times in maximam. The shear strength of samples in two groups is almost the same by the increase ratio of the calcined ginger nuts(CGN). The character of smooth/thread interface is strain hardening/softening in shear-slide curves. According to bond stress-slip relationship model, the fitting curves present good agreement with the test results. The research lays a theoretical foundation for the internal mechanical process of anchor system in earthen sites.更多还原