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Nonlinear Analysis of Single Laterally Loaded Piles in Clays Using Modified Strain Wedge Model

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Abstract

This paper proposes a modified strain wedge (MSW) model for nonlinear analysis of laterally loaded single piles in clays. The MSW model is used to calculate the soil resistance under increasing pile deflection. The stress–strain behavior of clays in the MSW, which is needed to calculate the soil resistance, is described in terms of both hyperbolic and bilinear stress–strain relationships. The subgrade reaction modulus of soil below the MSW is assumed to equal the conventional subgrade reaction modulus and to remain constant under the lateral loading of the pile. The applicability of the proposed model was verified by eight case histories. The results indicate that (1) the predicted results are consistent with the measurements for all eight full-scale tested piles; (2) the bilinear stress–strain relationship is not recommended for clays because the clays usually have a large ε 50 and, thus, they exhibit a linear behavior in the MSW during loading; (3) the predicted pile response is less sensitive to the effective friction angle than to the undrained shear strength; and (4) the proposed MSW model applies to normally consolidated clays and to overconsolidated clays until they reach their peak strength.

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Acknowledgments

This research was supported by the Natural Science Foundation of Jiangsu Province of China (Grant No. BK20150958), the National Natural Science Foundation of China (Grant Nos. 51508271, 51121005), and Postdoctoral Science Foundation of both Jiangsu Province, China (Grant No. 1501067B) and China (Grant No. 2015M581782), which are gratefully acknowledged.

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Authors and Affiliations

  1. College of Transportation Science and Engineering, Nanjing Tech University, No. 200, Zhongshan North Rd, Nanjing, 210009, China

    Ling-Yu Xu & Guo-Xing Chen

  2. Department of Environmental Engineering Science, Gunma University, 1-5-1 Tenjincho, Kiryu, 376-8515, Japan

    Fei Cai

  3. Faculty of Infrastructure Engineering, Dalian University of Technology, No. 2, Linggong Rd, Dalian, 116024, China

    Guo-Xin Wang

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  1. Ling-Yu Xu
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Correspondence to Fei Cai.

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Xu, LY., Cai, F., Wang, GX. et al. Nonlinear Analysis of Single Laterally Loaded Piles in Clays Using Modified Strain Wedge Model. Int J Civ Eng 15, 895–906 (2017). https://doi.org/10.1007/s40999-016-0072-8

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  • DOI: https://doi.org/10.1007/s40999-016-0072-8

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