烧料礓石改良土加固古遗址土城墙研究

以临潭县牛头城古遗址城墙维修与保护工程为依托，采用现场调查和室内试验确定遗址土和含烧料礓石夯筑用土的相关力学参数，并利用强度折减法和有限元分析软件ABAQUS研究烧料礓石加固土遗址后的应力-应变分布及安全系数变化规律。结果表明：采用低掺量烧料礓石改良土夯筑加固后的古遗址土城墙塑性应变区域发展得到明显遏制；对土遗址城墙中部风蚀和底部风蚀加固后遗址土城墙模型的稳定安全系数有明显提高，其加固7天后稳定安全系数分别为1.959和1.820，夯筑14天后的模型稳定安全系数分别为1.966和1.829。研究的结果可为烧料礓石夯筑土的实际工程应用提供理论依据。

Study on Ancient Ruins Earthen City Wall Reinforced by Improved Soil with Calcined Ginger Nuts

Based on the maintenance and protection project of Niutoucheng ancient sites wall in Lintan County, field investigation and laboratory test were used to determine the relevant mechanical parameters of the relics soil and the rammed soil with calcined ginger nuts. The stress-strain distribution and the variation of safety factor were studied by strength reduction method and finite element analysis software ABAQUS. The results show that the development of plastic strain area of the ancient ruins earthen city wall rammed and reinforced by improved soil with low content of calcined ginger nuts is obviously restrained, the stability safety factor of the model is significantly improved after the wind erosion in the middle and bottom of the wall, and the stability safety factors of the model after 7 days of reinforcement are 1.959 and 1.820 respectively, and those of the model after 14 days of ramming are 1.966 and 1.829 respectively. The results of the study can provide a theoretical basis for the practical engineering application of the rammed soil with calcined ginger nuts.