南京六朝建康都城城墙夯土遗址锚杆加固技术研究

Research on the reinforcement of the Six Dynasties earthen city wall site of Jian-Kang using anchor rods

为了对南京六朝建康都城城墙夯土遗址进行科学保护,确保遗址展示面的结构安全,首先通过ANSYS有限元模拟对城墙夯土遗址的现状及锚杆加固后的结构性能进行研究,分析包括锚杆长度、锚杆角度、锚杆弹模、锚杆直径、边坡坡度、锚杆间距、土体含水率等参数对遗址安全性的影响,得出不同参数变化下的夯土遗址结构的安全系数,给出了适合夯土遗址锚杆加固的优选技术参数。为了验证理论计算的准确性以及锚杆和灌浆材料施工的可行性,进行了锚杆和灌浆材料的拉拔试验。最后,结合理论分析和试验研究结果,提出了采用不锈钢锚杆和改性泥浆灌浆的方法进行遗址锚杆加固的设计方案。该城墙夯土遗址锚杆加固技术研究的成功,可为类似文物保护设计分析提供参考。

To scientifically preserve the earthen city wall site of Jian - Kang from the Six Dynasties in Nanjing, the structural performance of the earthen wall sites strengthened with anchor rods was analyzed with ANSYS. The relationship between the structural safety of the earthen wall site and important parameters including the length, angle diameter and spacing of anchors, thegrade of the side slopeand water content were then investigated. The structural safety factors and the optimal technical parameters for the anchor reinforcement of the earthen wall site were determined. In order to verily the accuracy of theoretieal analysis amt construction feasihility, pull - out tests of anchor rods and tests of grouting materials. Finally, based on theoretical analysis and test studies, an adaptive design for strengtheningthe earthen wall site with stainless anchor rods and modified mud grouting was proposed.