Experimental Study on Bearing Characteristics of Underreamed Rock Bolts in Aeolian Sand

DONG Jie; QIAN Ren; ZHANG Shuai; LI Ran

doi:10.13204/j.gyjzG21070808

Volume 52 Issue 8

Aug. 2022

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DONG Jie, QIAN Ren, ZHANG Shuai, LI Ran. Experimental Study on Bearing Characteristics of Underreamed Rock Bolts in Aeolian Sand[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(8): 180-186. doi: 10.13204/j.gyjzG21070808

Citation:

DONG Jie, QIAN Ren, ZHANG Shuai, LI Ran. Experimental Study on Bearing Characteristics of Underreamed Rock Bolts in Aeolian Sand[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(8): 180-186. doi: 10.13204/j.gyjzG21070808

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Experimental Study on Bearing Characteristics of Underreamed Rock Bolts in Aeolian Sand

doi: 10.13204/j.gyjzG21070808

Heibei University of Architecture; Hebei Key Laboratory of Diagnosis, Reconstruction and Anti-Disaster of Civil Engineering; Heibei Innovation Center of Transportation Infrastructure in Cold Region, Zhangjiakou 075000, China

Received Date: 2021-07-08
Available Online: 2022-12-01

Abstract

Abstract

In view of the phenomenon that the bearing capacity of anchor bolts in soil declines due to the large temperature differences between day and night and the geology of soft sand layer in Northwest China, the bearing characteristics of underreamed anchor bolts in aeolian sand and the influence of freeze-thaw cycles were studied. Based on 12 model test groups, the ultimate bearing capacity, load-displacement relations, stress in soil layers and the change of failure modes for anchor bolts with 6 types of anchor ends in different freeze-thaw cycles were obtained. The results showed that the ultimate bearing capacity of the underreamed anchor bolts had larger growth protential in the condition of high confining pressure (deep buried in aeolian sand). The increase of anchored end volumes could effectively improve the ultimate bearing capacity of underreamed bolts in aeolian sand, and existed an optimal design ratio of anchorage ends. With the increase of freeze-thaw cycles, the appearance of inflection points in load-displacement curves and the ultimate bearing capacity were advanced. The stress in the soil layer changed abruptly and the attenuation accelerated rapidly, then the deformation increased at the time of failure
- aeolian sand,
- underreamed anchor bolt,
- freeze-thaw cycle,
- pull-out feature

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References(16)

References

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