Discontinuous deformation analysis of super section tunnel surrounding rock stability based on joint distribution simulation

He, Peng; Li, Shucai; Li, Liping; Zhang, Qian‐qing; Xu, Fei; Chen, Yun-juan

doi:10.1016/j.compgeo.2017.07.022

Cited by 47 publications

(15 citation statements)

References 12 publications

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“…With regard to the uncertainties existing in rock mass properties, the design of tunnel support in squeezing ground has always been a sophisticated task [20,21]. Many scholars have done research on tunnel support structure where the achievements are mainly carried out from three aspects of empirical method, analytical method, and numerical method [22][23][24]. As for tunnel support design, although analytical and numerical methods are generally considered to be the most effective and scientific way, they also have obvious shortcomings and limitations in use.…”

Section: Introductionmentioning

confidence: 99%

Support System for Tunnelling in Squeezing Ground of Qingling‐Daba Mountainous Area: A Case Study from Soft Rock Tunnels

Wang

Lai

Garnes

et al. 2019

Advances in Civil Engineering

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Tunnelling or undertaking below-ground construction in squeezing ground can always present many engineering surprises, in which this complicated geology bring a series of tunnelling difficulties. Obviously, if the major affecting factors and mechanism of the structure damage in these complicated geological conditions are determined accurately, fewer problems will be faced during the tunnel excavation. For this study, reference is made to four tunnel cases located in the Qingling-Daba mountainous squeezing area that are dominated by a strong tectonic uplift and diversified geological structures. This paper establishes a strong support system suitable for a squeezing tunnel for the purpose of addressing problems exhibited in the extreme deformation of rock mass, structure crack, or even failure during excavation phase. This support system contains a number of temporary support measures used for ensuring the stability of tunnel face during tunnelling. The final support system was constructed, including some key techniques such as the employment of the foot reinforcement bolt (FRB), an overall strong support measure, and more reserved deformation. Results in this case study showed significant effectiveness of the support systems along with a safe and efficient construction process. The tunnel support system proposed in this paper can be helpful to support design and provide sufficient support and arrangement before tunnel construction in squeezing ground.

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Section: Introductionmentioning

confidence: 99%

Support System for Tunnelling in Squeezing Ground of Qingling‐Daba Mountainous Area: A Case Study from Soft Rock Tunnels

Wang

Lai

Garnes

et al. 2019

Advances in Civil Engineering

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“…Lueprasert et al proposed a method for predicting the deformation of soft tunnels on the basis of the horizontal and vertical tunnel contraction and elongation [5]. He et al simulated the deformation and failure process of weak surrounding rocks with an improved discontinuous deformation analysis method and the discontinuous deformation analysis for rock failure (DDARF) joint simulation model, which can simulate the deformation and failure of tunnel surrounding rocks [6]. He et al established a modified formula for calculating the deformation of surrounding rocks with time and space effects of tunnel excavation [7].…”

Section: Introductionmentioning

confidence: 99%

Deformation Characteristics and Influence Factors of a Shallow Tunnel Excavated in Soft Clay with High Plasticity

Lei

Ji-yao

Lin

et al. 2019

Advances in Civil Engineering

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A series of problems, including large deformation of supporting structures, shotcrete peeling, and yielding of the steel frame, occurs constantly during tunnel construction in soft clay layers. These problems considerably raise the risk of tunnel construction. Thus, the deformation characteristics of soft clay around the tunnel during construction must be investigated to guarantee safety. In this research, a field test was conducted on 50 sections of a tunnel, which was built in high-plasticity clay layers. Then, the deformation characteristics of surrounding rocks and influencing laws caused by burial depth, invasion thickness of soft clay, and atmospheric precipitation were discussed. Results indicated that surrounding rocks are most likely to undergo large deformation during tunnel construction when the burial depth of tunnel ranges from 1.5D to 2.5D (D is the tunnel excavation span). Tunnel deformation also increases rapidly when the invasion thickness exceeds 60% of the tunnel height. The ratio between clay thickness and burial depth of the tunnel is another crucial index that could cause a large tunnel deformation as it exceeds 0.25. In addition, a significant correlation was observed between tunnel deformation and rainfall during the construction period. The deformation of surrounding rocks increases rapidly with rainfall and will continually develop for 1-2 weeks when the average daily rainfall is greater than 4 mm.

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“…In these previous geomechanical modelling studies, different types of numerical boundary constraints, e.g. stress boundary constraints [3,16,[21][22][23][24][25], displacement boundary constraints and combined stress-displacement boundary constraints [17,18,[26][27][28], have been assumed for simulating the geological confinement imposed by surrounding rocks onto the problem domain (e.g. Fig.…”

Section: /25 1 Introductionmentioning

confidence: 99%

“…Dramatic stress change observed near a fault. Note that the pairs of orthogonal intersecting lines represent the principal stress orientations and their length denote the principal stress magnitudes at different locations[8] 17/25 (a) Boundary loading acting directly on the rock model[3,16,[21][22][23][24][25] Direct loading and roller boundary on the rock model[17] fault transection  (c) Direct loading and roller boundary on the rock model[18,26] …”

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Influence of boundary constraints on stress heterogeneity modelling

Gao

Lei

2018

Computers and Geotechnics

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Discontinuous deformation analysis of super section tunnel surrounding rock stability based on joint distribution simulation

Cited by 47 publications

References 12 publications

Support System for Tunnelling in Squeezing Ground of Qingling‐Daba Mountainous Area: A Case Study from Soft Rock Tunnels

Support System for Tunnelling in Squeezing Ground of Qingling‐Daba Mountainous Area: A Case Study from Soft Rock Tunnels

Deformation Characteristics and Influence Factors of a Shallow Tunnel Excavated in Soft Clay with High Plasticity

Influence of boundary constraints on stress heterogeneity modelling

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