抄録
In order to grasp the relationship between bearing capacity and deformation of mud walls, full-scale tests that require considerable economical and time investments are needed. Therefore, we have studied on the estimation formula for the relationship between bearing capacity and deformation of mud walls without openings based on soil mechanics. The objective of this study is to estimate the relationship between bearing capacity and deformation of mud walls with opening by the mechanical characteristics of wall clay obtained from the results of material tests.
In order to grasp the fracture mode of mud walls with opening, full-scale lateral loading tests for specimens with hanging walls and siding walls are conducted. As shown in Figure 1, the length and height of specimens are 3640mm and 2767.5mm, respectively. Total 4 specimens are selected to examine the effect of reinforcement at the connection of column-to-lintel. The maximum load of specimen with reinforcement is almost same as that of specimen without reinforcement. However, the deformation angle at maximum load of specimen with reinforcement is smaller than that of specimen without reinforcement owing to the effect of reinforcement at the connection of column-to-lintel. Regarding the fracture mode, the hanging walls and siding walls are collapsed with initial failure in compression or pull-out of lintel and compression.
The mechanical model to estimate the relationship between bearing capacity and deformation of mud walls with opening is proposed based on soil mechanics. The material characteristics of wall clay is determined from the results of unconfined compression tests as shown in Figure 4. The relationship between bearing capacity and deformation of the hanging and siding wall is estimated considering two types of fracture mode with initial failure in compression and pull-out of lintel and compression. As a result, the relationship between bearing capacity and deformation of mud walls with opening is estimated considering the deformation of columns, hanging walls and siding walls as shown in Figure 10.
The estimation results are compared with the experiment results to evaluate the accuracy of the proposed method. The estimation results are almost the same as the experiment results. However, there are some variations between estimation and experiment results owing to the simple mechanical model. The average value of the ratio of the experiment value Peu to the estimation value Pcu is 1.08, and the variation coefficient is 0.08 as shown in Figure 18. Therefore, it is found that the proposed method is available for mud walls with opening.
