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| Study on impact stress distribution of ground reinforced embankments under rockfall impact |
| LU Liang1，2，3，ZHANG Yuechen1，2，WANG Zongjian4，TANG Tiantian1，2，XIAO Liang1，2，MA Shuwen1，2 |
| (1. Key Laboratory of New Technology for Construction of Cities in Mountain Area，Ministry of Education，Chongqing University，Chongqing 400045，China；2. School of Civil Engineering，Chongqing University，Chongqing 400045，China；3. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas，Chongqing 400045，China；4. College of River and Ocean Engineering，Chongqing Jiaotong University，Chongqing 400074，China) |
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Abstract In order to study the impact stress distribution law of ground reinforced embankments under falling rock impact，the model tests of ground reinforced embankments and pile-plate retaining walls under the impact of a rock block were designed. The comparison tests reveal the change law of the peak impact stress of ground reinforced embankments under the impact of rockfall. The test results show that the impact stress distributions of the ground reinforced embankment and the pile-plate retaining wall change in stages，while the impact force of ground reinforced embankment when cracks appear is about twice that of the pile-plate retaining wall. Compared with the obvious stress concentration near the impact point of the pile-plate retaining wall，the stress distribution of the ground reinforced embankment is uniform，the deformation of the wall is small，and the stress dissipation rate is about 50% smaller. Combined with the modified Hertz contact impact force calculation formula and Boussinesq equation，an internal impact stress calculation method of ground reinforced embankments is obtained. Through experimental and theoretical comparisons，it is found that the stress distribution and the impact resistance of the ground reinforced embankment under rockfall impact are better than those of the pile-plate retaining wall. The research results can provide theoretical basis for the performance research and engineering application of reinforced soil structures under impact loads.
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2021, Vol. 40 
