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| Research on the Additional Stress Distribution of Underlying Stratum under Embankment Load |
| LI Jian-guo1，BAI Chao-neng2 |
| (1.Southwest Jiaotong University, Emeishan, Sichuan 614202, China; 2.Xi′an Railway Survey and Design Institute Co. Ltd, Xi′an, Shaanxi 710054, China) |
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Abstract Abstract：Research purposes： Because of no considering the influence of the soil distribution and main design parameters of the composite foundation, the traditional calculation method for additional stress cannot estimate layer under additional stress accurately. Using numerical simulation, the influence rule of pile spacing, pile elastic modulus, 〖JP3〗 elastic modulus ratio of reinforcement area soil to under layer of composite ground and pile length on underlying stratum′s〖JP〗 additional stress are analyzed systematically in this paper. By introducing the load transfer coefficient, the fitting relation between numerical simulation solution and Boussinesq solution of additional stress in underlying stratum is established. Research conclusions： (1) There is an obvious stress concentration phenomenon in underlying stratum of composite ground. (2) With the decrease of pile spacing or increase of pile elastic modulus, the additional stress increases; With the increase of elastic modulus ratio of reinforcement area soil to underlying substratum, the additional stress decreases gradually; With the increase of pile length, the attenuation of additional stress in the substratum becomes slowly, and the upper load is transferred to the deeper strata. (3)The fitting relation between numerical simulation solution and Boussinesq solution of additional stress is established. (4) The research conclusion has a good reference value for engineering staff to estimate the additional stress of underlying stratum.
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Received: 08 May 2017
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2017, Vol. 34 
