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Experimental study on slurry-induced fracturing during shield tunneling

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Abstract

Facial support in slurry shield tunneling is provided by slurry pressure to balance the external earth and water pressure. Hydraulic fracturing may occur and cause a significant decrease in the support pressure if the slurry pressure exceeds the threshold of the soil or rock material, resulting in a serious face collapse accident. Preventing the occurrence of hydraulic fracturing in a slurry shield requires investigating the effects of related influencing factors on the hydraulic fracturing pressure and fracture pattern. In this study, a hydraulic fracturing apparatus was developed to test the slurry-induced fracturing of cohesive soil. The effects of different sample parameters and loading conditions, including types of holes, unconfined compressive strength, slurry viscosity, and axial and circumferential loads, on the fracturing pressure and fracture dip were examined. The results indicate that the fracture dip is mainly affected by the deviator stress. The fracturing pressure increases linearly with the increase in the circumferential pressure, but it is almost independent of the axial pressure. The unconfined compressive strength of soil can reflect its ability to resist fracturing failure. The fracturing pressure increases with an increase in the unconfined compressive strength as well as the slurry viscosity. Based on the test results, an empirical approach was proposed to estimate the fracturing pressure of the soil.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Grant Nos. KCA313017533 and C16A300190).

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Authors and Affiliations

  1. Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing, 100044, China

    Teng Wang, Dajun Yuan, Dalong Jin & Xinggao Li

Authors
  1. Teng Wang
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  2. Dajun Yuan
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  3. Dalong Jin
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  4. Xinggao Li
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Correspondence to Dalong Jin.

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Wang, T., Yuan, D., Jin, D. et al. Experimental study on slurry-induced fracturing during shield tunneling. Front. Struct. Civ. Eng. 15, 333–345 (2021). https://doi.org/10.1007/s11709-021-0718-8

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  • DOI: https://doi.org/10.1007/s11709-021-0718-8

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