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| Study on the pile-soil stress ratio of the composite foundations reinforced#br#
by piles and solidification layer |
| CHEN Long1，2，CHAI Zhewei1，SHEN Zheng3，CHEN Yonghui1，4，XIE Chenlei1，LI Desheng1 |
(1. Key Laboratory of Rock Mechanics and Dam Engineering，Ministry of Education，Hohai University，Nanjing，Jiangsu 210023，China；2. Institute of Ocean and Offshore Engineering Nantong，Hohai University，Nantong，Jiangsu 226334，
China；3. Beijing Liandong Investment(Group) Co.，Ltd.，Beijing 101111，China；4. Suzhou Research
Institute Hohai University，Suzhou，Jiangsu 210019，China)
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Abstract The pile-soil stress ratio of the composite foundation reinforced by piles and solidification layer under embankment load was studied. The friction resistance of pile was supposed to be constant in the solidification layer and linearly increased with depth in the soft layer，considering the impacted of the relative displacement of pile and soil. Based on the load-transfer method，the force on the discretization of the soil and piles were analyzed. The analytical expression of the pile-soil stress ratio of the composite foundations was derived，taking the compatibility equation of deformation into consideration. The influence factors of the pile-soil stress ratio such as the solidification layer，the modulus and thickness influence were studied. The result show that set solidification layer on deep soft soil foundation using the suitable dosage of curing agent can decrease the pile-soil stress ratio，increase the bearing capacity of soil between piles and the composite foundation. The increase amplitude is not obvious while the elasticity modulus of the solidification layer larger than 50 MPa，so the dosage of curing agent should be in the suitable range. The pile-soil stress ratio increase with the increasing thickness of the solidification layer，but the choose of the thickness should in the right range from a economy perspective.
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2023, Vol. 42 
