世遗土楼夯土墙身材料强度无损检测方法研究

发布时间：2018-05-31 01:29

本文选题：可靠性评估 + 夯土材料强度　；参考：《华侨大学》2013年硕士论文

【摘要】：福建客家土楼凭借其特别的建筑特色以及文化底蕴而备受全球瞩目。虽然土楼能屹立风雨中几百年不倒，但随着时间的推移，越来越多的土楼发生破坏甚至倒塌，，为了能让这一象征着古代劳动人民智慧的特殊建筑长存下去，必须对土楼进行具有对应性的修缮以及加强维护。采用静三轴试验和轴向抗压破坏试验对从现场采样而得到的夯土试块进行力学性质研究，得到了在不同含水率、不同围压下直径39.1mm、高度80mm的圆柱体夯土试样的三轴试验破坏模式和边长为150mm的立方体夯土试块轴向抗压试验的破坏模式，然后与岩石试样的三轴试验破坏模式和混凝土试块轴向抗压试验的破坏模式进行对比，发现夯土材料在其正常含水率以及受力情况下呈现出与混凝土等普通建筑材料相似的力学性质。根据所得出的材料力学性质选取回弹仪作为土墙强度的无损检测方法，并作出适当改造从而提高了回弹仪的检测精度。参照混凝土专用测强曲线的建立方法，采用边长为150mm的历史为110年、240年夯土立方体试块进行室内回弹以及抗压强度试验，运用MATLAB数学分析软件拟合得到专用于110年、240年土墙强度现场无损检测的测强曲线和曲线方程式。应用回弹仪对一座历史为110年的在役土楼的一片土墙进行检测，并对建筑结构尺寸和所承受荷载进行测量计算，根据标准计算该土墙安全可靠性系数，评定其承载力安全等级后确定对该土墙所需作出的保护计划和加固维修措施。
[Abstract]:Fujian Hakka Tulou has attracted worldwide attention because of its special architectural characteristics and cultural details. Although the earth buildings can stand in the wind and rain for hundreds of years, but with the passage of time, more and more earth buildings have been destroyed or even collapsed, in order to make this special building, which symbolizes the wisdom of the ancient working people, to last for a long time. It is necessary to repair and strengthen the maintenance of earthen buildings. Static triaxial test and axial compression failure test were used to study the mechanical properties of rammed soil samples obtained from field sampling. Under different confining pressures, the failure mode of triaxial test and the axial compression test of cubic rammed soil specimen with 150mm side length of 39.1 mm in diameter and height of 80mm, Then compared with the failure mode of triaxial test of rock specimen and the failure mode of axial compression test of concrete specimen, It is found that the tamped soil material shows similar mechanical properties to the common building materials such as concrete under its normal moisture content and stress. According to the mechanical properties of materials, the resilience instrument is selected as the nondestructive testing method of the strength of the earth wall, and the testing accuracy of the rebound elastic instrument is improved by the appropriate modification. Referring to the method of establishing concrete strength measurement curve, the indoor springback and compressive strength tests of rammed soil cube test blocks with the history of 110 years and 240 years of side length 150mm are carried out. The curve and equation of strength measurement for 110 years and 240 years of soil wall strength field nondestructive testing were obtained by using MATLAB mathematical analysis software. The earth wall of an existing earth building with a history of 110 years has been tested by using an elastic recoil, and the structural size and load of the building have been measured and calculated, and the safety and reliability coefficient of the earth wall has been calculated according to the standard. After assessing the safety grade of bearing capacity, the protection plan and reinforcement and maintenance measures for the earth wall are determined.
【学位授予单位】：华侨大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU521.3;TU502

【参考文献】