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Study on the deformation and failure modes of filling slope in loess filling engineering: a case study at a loess mountain airport

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Abstract

Lvliang airport is a typical loess filling engineering located in 20.5 km north of Lvliang City in Shanxi Province, China. By the end of March 2012, 14 fissures extending more than 7.5 m were observed in a loess-filled slope, of which the longest fissure is up to 82 m. Field monitoring and laboratory tests have been performed to investigate the slope failure modes. The test program includes wetting tests on unsaturated compacted samples and stress path tests on saturated samples. Field monitoring and observations show that differential settlement caused by non-homogeneity in compacted loess density might lead to the formation of fissures in the loess-filled slope. It was founded that the wetting deformation contributed to the development of differential settlement. Fissures are the essential factor for the loess-filled slope failure. Four deformation stages exhibit in the loess-filled slope prior final failure including development of the fissures, softening of the compacted loess, creeping of the slope leading edge and fissuring of the trailing edge and formation of the through-sliding surface. Development of the sliding surface mainly includes upward and downward expansion of the fissures. Upward expansion is a wetting failure process in loading condition, while downward expansion is a load-off wetting process. In addition, development of the sliding surface is accelerated by softening of the compacted soils as a result of water infiltration. Therefore, the key for taking countermeasures against filling landslides is to monitor and control the development of differential settlement and fissures in the slope shoulders. Digging out and extra-filling the fissures are an effective way for preventing these landslides.

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Acknowledgments

We sincerely appreciate the constructive comments of the anonymous reviewers.

Funding

The research presented in this paper was funded by the State Key Program of National Natural Science Foundation of China (Grant No. 41630639, 41372329).

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Authors and Affiliations

  1. State Key Laboratory of Continental Dynamics, Northwest University, Xi’an, 710069, China

    Jiading Wang, Yuanjun Xu, Yan Ma, Shaonan Qiao & Kaiqiang Feng

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  1. Jiading Wang
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  2. Yuanjun Xu
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  3. Yan Ma
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  4. Shaonan Qiao
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  5. Kaiqiang Feng
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Correspondence to Yuanjun Xu.

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Wang, J., Xu, Y., Ma, Y. et al. Study on the deformation and failure modes of filling slope in loess filling engineering: a case study at a loess mountain airport. Landslides 15, 2423–2435 (2018). https://doi.org/10.1007/s10346-018-1046-5

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  • DOI: https://doi.org/10.1007/s10346-018-1046-5

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