Abstract：At present，there are few studies of applicable conditions of models and evolution laws of soil arching effect. To solve this issue，a new plane strain model test apparatus is developed to discover macroscopic soil arch shape under different pile spacings and the evolution process of soil arching during the settlement of soil between the piles. Soil and piles are simplified into removable plates and rigid plates，and the pile-soil interaction is simplified into relative settlement on the pile top，which could be simulated by moving the removable plates in a precise way. Photographic survey is applied to the model test. Every 0.02 mm when the plates settle，a photo is taken. Then whole field displacements of the embankment can be measured by tracing the particles. Nine groups of piled embankment model tests with 3 different filling heights and 3 different pile spacings are carried out with the new apparatus. A couple of symmetrical triangular sliding surfaces appear initially in all the 9 tests，which is called initial triangular arch model. Following two different evolution modes for the initial triangular arch model will be revealed with further moving the removable plates：in the case of H/(s?a)＜1.8，the initial triangular arch model will turn to be triangular multi-arch model with the increased settlement of soil between piles；in the other case of H/(s?a)≥1.8，the initial triangular arch model will evolve into pagoda-shaped multi-arch model with the increased settlement of soil between piles. Key parameters of different stages of the models are summarized，which will provide reference for the next mechanical analysis in soil arching development condition.
陆坤权，刘寄星. 颗粒物质(上)[J]. 物理，2004，(9)：629-635.(LU Kunquan，LIU Jixing. Static and dynamic properties of granular matter(I)[J]. Physics，2004，(9)：629-635.(in Chinese))
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2014, Vol. 33 
