为了探究圆明园舍卫城城墙夯土工艺,采用X射线衍射(diffraction of X-rays,XRD)分析、激光粒度分析及密度与孔隙率分析等手段,对圆明园舍卫城城墙的夯土进行理化检测和工艺性能研究。结果表明:舍卫城城墙主要由石灰和土组成,且没有人为...为了探究圆明园舍卫城城墙夯土工艺,采用X射线衍射(diffraction of X-rays,XRD)分析、激光粒度分析及密度与孔隙率分析等手段,对圆明园舍卫城城墙的夯土进行理化检测和工艺性能研究。结果表明:舍卫城城墙主要由石灰和土组成,且没有人为添加细砂,灰土比最接近二八灰土,与《工程做法则例》中的十六把小夯灰土相吻合。同时,通过多种科学数据对比,可进一步推测在夯筑灰土过程中,下层夯土使用了更多的灰土量。多层次的夯土制作工艺,展示了清代宫廷工匠对夯土技术的工艺认识和制作方法。相关结果为研究圆明园的建筑特点,夯土城墙的文物保护和科学修复等内容,提供了重要科学支持和有益借鉴。展开更多
In order to evaluate the seismic stability of reinforced soil walls against bearing capacity failure,the seismic safety factor of reinforced soil walls was determined by using pseudo-dynamic method,and calculated by c...In order to evaluate the seismic stability of reinforced soil walls against bearing capacity failure,the seismic safety factor of reinforced soil walls was determined by using pseudo-dynamic method,and calculated by considering different parameters,such as horizontal and vertical seismic acceleration coefficients,ratio of reinforcement length to wall height,back fill friction angle,foundation soil friction angle,soil reinforcement interface friction angle and surcharge.The parametric study shows that the seismic safety factor increases by 24-fold when the foundation soil friction angle varies from 25°to 45°,and increases by 2-fold when the soil reinforcement interface friction angle varies from 0 to 30°.That is to say,the bigger values the foundation soil and/or soil reinforcement interface friction angles have,the safer the reinforced soil walls become in the seismic design.The results were also compared with those obtained from pseudo-static method.It is found that there is a higher value of the safety factor by the present work.展开更多
文摘为了探究圆明园舍卫城城墙夯土工艺,采用X射线衍射(diffraction of X-rays,XRD)分析、激光粒度分析及密度与孔隙率分析等手段,对圆明园舍卫城城墙的夯土进行理化检测和工艺性能研究。结果表明:舍卫城城墙主要由石灰和土组成,且没有人为添加细砂,灰土比最接近二八灰土,与《工程做法则例》中的十六把小夯灰土相吻合。同时,通过多种科学数据对比,可进一步推测在夯筑灰土过程中,下层夯土使用了更多的灰土量。多层次的夯土制作工艺,展示了清代宫廷工匠对夯土技术的工艺认识和制作方法。相关结果为研究圆明园的建筑特点,夯土城墙的文物保护和科学修复等内容,提供了重要科学支持和有益借鉴。
文摘In order to evaluate the seismic stability of reinforced soil walls against bearing capacity failure,the seismic safety factor of reinforced soil walls was determined by using pseudo-dynamic method,and calculated by considering different parameters,such as horizontal and vertical seismic acceleration coefficients,ratio of reinforcement length to wall height,back fill friction angle,foundation soil friction angle,soil reinforcement interface friction angle and surcharge.The parametric study shows that the seismic safety factor increases by 24-fold when the foundation soil friction angle varies from 25°to 45°,and increases by 2-fold when the soil reinforcement interface friction angle varies from 0 to 30°.That is to say,the bigger values the foundation soil and/or soil reinforcement interface friction angles have,the safer the reinforced soil walls become in the seismic design.The results were also compared with those obtained from pseudo-static method.It is found that there is a higher value of the safety factor by the present work.
