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| Experimental study on load bearing performance of stone columns under different reinforcement methods |
| LI Lihua1，2，CAO Yu1，2，LIU Juqiang1，2，XIAO Henglin1，2，ZHANG Dongfang1,2，LIU Yiming1,2 |
(1. School of Civil Engineering，Architecture and Environment，Hubei University of Technology，Wuhan，Hubei 430068，China；
2. Ecological Road Engineering Research Center，Hubei University of Technology，Wuhan，Hubei 430068，China) |
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Abstract An model test set of gravel pile composite foundation was fabricated，and 11 sets of model tests of reinforced gravel pile composite foundation and 2 sets of unreinforced comparison tests were carried out. The composite foundation bearing capacity，pile-soil stress ratio，bearing capacity improvement rate and pile bulge deformation under different parcel length，reinforcement spacing and reinforcement combination methods are researched. The test results show that compared with the traditional gravel pile，the bearing capacity of the composite foundation is significantly improved by reinforcement，and the vertical reinforcement effect of the full-length wrapped is the most significant；The reinforcement method with larger composite foundation bearing capacity improvement corresponds to larger bearing capacity improvement rate and pile-soil stress ratio. The improvement rate of bearing capacity increases with the increase of reinforcement length and reinforcement spacing；The pile-soil stress ratio of the composite foundation fluctuates with the increase of settlement. And increases with the reduction of reinforcement spacing and the increase of reinforcement length；There are some differences in the deformation law of pile body under different reinforcement methods. The bulging deformation of pile body with full-length wrapped vertical reinforcement method is relatively uniform and the deformation is small，which has better effect on improving the bearing capacity of composite foundation and inhibiting the bulging deformation of pile body.
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