Experimental study on the progressive failure and its anchoring effect of weak-broken rock vertical slope

doi:10.1007/s11709-011-0111-0

Front Arch Civil Eng Chin

2011, Vol. 5

Issue (2) : 208-224 https://doi.org/10.1007/s11709-011-0111-0

RESEARCH ARTICLE

Experimental study on the progressive failure and its anchoring effect of weak-broken rock vertical slope

Hehua ZHU¹(

), Qianwei XU^1,2, Wenqi DING¹, Feng HUANG¹

1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Urban Rail Transit and Railway Engineering Department, Tongji University, Shanghai 200092, China

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Abstract

To improve the understanding on the failure behavior and its anchoring effect of weak-broken rock slope, the rock of grade IV according to China is taken as reference prototype, and a series of model tests were carried out in laboratory. These tests can be divided into two categories, that is, with bolt reinforcement and without bolt reinforcement. In which, the stability of slope reinforced with different bolt diameter, different anchor length and different space are studied. The test results show that the collapse of slope is the combination of tension failure at the top and the compression-shearing failure at the bottom of the slope, and its failure process presents progressive characteristics. The contributions of bolt reinforcement are mainly reflected by the aspects of shear resistance, crack resistance and anti-extension. The reinforcement of blot not only can improve the vertical bearing capacity before failure, but also can reduce the vertical settlement and allow greater lateral rock wall deformation; what is more, the stress concentration degree in rock mass can be dispersed, which do help to improve the stability of slope rock mass.

Keywords progressive failure weak-broken rock slope model test bolt

Corresponding Author(s): ZHU Hehua,Email:zhuhehua@tongji.edu.cn

Issue Date: 05 June 2011

Cite this article:

Hehua ZHU,Qianwei XU,Wenqi DING, et al. Experimental study on the progressive failure and its anchoring effect of weak-broken rock vertical slope[J]. Front Arch Civil Eng Chin, 2011, 5(2): 208-224.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-011-0111-0
https://academic.hep.com.cn/fsce/EN/Y2011/V5/I2/208

Fig.1 Sketch map of loading in model test (unit: mm)

Tab.1 Prototype and model rock mechanical properties

Fig.2 Measure layout of displacement and stress (unit: mm)

Fig.3 Elevation view of displacement measurement (unit: mm)

Fig.4 Elevation view of stress measurement (unit: mm)

Fig.5 Arrangement of bolt. (a) Elevation view of bolt arrangement; (b) profile of bolt arrangement (case 2, unit: mm)

Fig.6 Arrangement of bolt. (a) Elevation view of bolt arrangement; (b) profile of bolt arrangement (case 3, unit: mm).

Fig.7 Arrangement of bolt. (a) Elevation view of bolt arrangement; (b) profile of bolt arrangement (case 4, unit: mm)

Fig.8 Arrangement of bolt. (a) Elevation view of bolt arrangement; (b) profile of bolt arrangement (case 5, unit: mm)

Fig.9 Arrangement of bolt. (a) Elevation view of bolt arrangement; (b) profile of bolt arrangement (case 6, unit: mm)

Fig.10 Arrangement of bolt. (a) Elevation view of bolt arrangement; (b) profile of bolt arrangement (case 7, unit: mm)

Fig.11 Progressive failure process of the vertical slope without bolt reinforcement in case 1

Fig.12 Final failure face shape of A-A cross-section without bolt reinforcement in case 1 (unit: mm)

Fig.13 Progressive failure process of the vertical slope with bolt reinforcement in case 2

Fig.14 Final failure face shape of A-A cross-section with bolt reinforcement in case 2 (unit: mm)

Fig.15 Progressive failure process of the vertical slope with bolt reinforcement in case 3

Fig.16 Final failure shape of A-A cross-section with bolt reinforcement in case 3 (unit: mm)

Fig.17 Progressive failure process of the vertical slope with bolt reinforcement in case 4

Fig.18 Final failure shape of A-A cross-section with bolt reinforcement in case 4 (unit: mm)

Fig.19 Progressive failure process of the vertical slope with bolt reinforcement in case 5

Fig.20 Final failure shape of A-A cross-section with bolt reinforcement in case 5 (unit: mm)

Fig.21 Progressive failure process of the vertical slope with bolt reinforcement in case 6

Fig.22 Final failure shape of A-A cross-section with bolt reinforcement in case 6 (unit: mm)

Fig.23 Progressive failure process of the vertical slope with bolt reinforcement in case 7

Fig.24 Final failure shape of A-A cross-section with bolt reinforcement in case 7 (unit: mm)

Fig.25 Variation of displacement curve in case 1

Fig.26 Variation of displacement curve in case 2

Fig.27 Variation of displacement curve in case 3

Fig.28 Variation of displacement curve in case 4

Fig.29 Variation of displacement curve in case 5

Fig.30 Variation of displacement curve in case 6

Fig.31 Variation of displacement curve in case 7

Fig.32 Variation of horizontal stress during the loading process without bolt reinforcement in case 1

Fig.33 Variation of horizontal stress at different depth without bolt reinforcement in case 1

Fig.34 Variation of vertical stress during the loading process without bolt reinforcement in case 1

Fig.35 Variation of vertical stress at different depth without bolt reinforcement in case 1

Fig.36 Variation of horizontal stress during the loading process with bolt reinforcement in case 2

Fig.37 Variation of horizontal stress at different depth with bolt reinforcement in case 2

Fig.38 Variation of vertical stress during the loading process with bolt reinforcement in case 2

Fig.39 Variation of vertical stress at different depth with bolt reinforcement in case 2

Fig.40 Variation of horizontal stress during the loading process with bolt reinforcement in case 3

Fig.41 Variation of horizontal stress at different depth with bolt reinforcement in case 3

Fig.42 Variation of vertical stress during the loading process with bolt reinforcement in case 3

Fig.43 Variation of vertical stress at different depth with bolt reinforcement in case 3

Fig.44 Variation of horizontal stress during the loading process with bolt reinforcement in case 4

Fig.45 Variation of horizontal stress at different depth with bolt reinforcement in case 4

Fig.46 Variation of vertical stress during the loading process with bolt reinforcement in case 4

Fig.47 Variation of vertical stress at different depth with bolt reinforcement in case 4

Fig.48 Variation of horizontal stress during the loading process with bolt reinforcement in case 5

Fig.49 Variation of horizontal stress at different depth with bolt reinforcement in case 5

Fig.50 Variation of vertical stress during the loading process with bolt reinforcement in case 5

Fig.51 Variation of vertical stress at different depth with bolt reinforcement in case 5

Fig.52 Variation of horizontal stress during the loading process with bolt reinforcement in case 6

Fig.53 Variation of horizontal stress at different depth with bolt reinforcement in case 6

Fig.54 Variation of vertical stress during the loading process with bolt reinforcement in case 6

Fig.55 Variation of vertical stress at different depth with bolt reinforcement in case 6

Fig.56 Variation of horizontal stress during the loading process with bolt reinforcement in case 7

Fig.57 Variation of horizontal stress at different depth with bolt reinforcement in case 7

Fig.58 Variation of vertical stress during the loading process with bolt reinforcement in case 7

Fig.59 Variation of vertical stress at different depth with bolt reinforcement in case 7

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