夯土介质中基于PS浆液的楠竹锚杆锚固特性

ANCHOR PERFORMANCE OF BAMBOO BOLT GROUTED BY PS SOLUTION- BASED SLURRY AMONG RAMMED EARTH MEDIUM

基于PS溶液的楠竹锚杆锚固系统在夯筑土遗址加固中得到了成功的应用，然而其锚固机理研究还未开展。运用室内物理模型试验，针对该锚固系统开展了拉拔测试与杆体-浆体界面应变监测，研究了该锚固系统的锚固性能与破坏模式、杆体-浆体界面剪应变分布与传递特征。试验结果表明基于PS-F浆液锚固系统和基于PS-（C＋F）浆液锚固系统均为杆体-浆体界面失效模式，极限锚固力分别为10～15kN和8～16kN；锚固系统均具有较强的延性；在荷载进程中杆体-浆体界面的应变分布具有单峰值及双峰值特点，荷载增加时界面应力向锚固末端传递、压应力出现在锚固段末端及峰值局部出现在末端等特征。研究结论表明，锚固系统的力学性能适用于夯筑土遗址加固，但在杆材耐久性和完整性保证方面还需要进一步探究。

Anchor system of bamboo bolt fully grouted by PS solution-based slurry is successfully applied in the conservation of rammed earth sites. However, the research on its anchoring mechanism has not been conducted so far. By means of the laboratory physical model experiment, anchor capacity, failure mode, strain distribution and load transfer along bolt-grout interface are tested. Experiments reveal that both PS-F and PS-（C＋F）anchor system fail at the bolt-grout interface with ultimate pullout force of 10-15kN and 8-16kN respectively. Both of them have strong ductility. During load increment, single-peak and double-peak distributions emerge along bolt-grout interface. Meanwhile, load gradually transfers toward anchor end along with emergence of compressive strain and local peak value near anchor end. All these performance depicts the complicated mechanism. In conclusion, the researched anchor systems are suitable to the conservation of rammed earth sites in terms of anchor capacity. However, durability and structural integrity guarantee of bamboo bolt should be further studied.