Case Study of Modified H–B Strength Criterion in Discrimination of Surrounding Rock Loose Circle

Wang, Rui; Deng, Xianghui; Meng, Yaoyao; Yuan, Dongyang; Xia, Daohong

doi:10.1007/s12205-019-1055-5

Cited by 16 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the ongoing progress of highway construction in China, particularly in the western regions, more and more technical problems have emerged. These problems are prevalent in relation to the design and complex geological conditions in long tunnels, which the majority of tunnel builders have to face [1][2][3]. A significant concern for tunnel builders is the tendency of soft surrounding rock to cause issues such as twisting and deformation of steel arches, primary supports exceeding the clearance limit, and tunnel face sliding.…”

Section: Introductionmentioning

confidence: 99%

Research on Double-Layer Support Control for Large Deformation of Weak Surrounding Rock in Xiejiapo Tunnel

Sun,

Li,

et al. 2024

Buildings

Self Cite

View full text Add to dashboard Cite

Double-layer primary support is proposed to control the deformation of surrounding rock in tunnels within weak geological conditions, where engineering challenges such as large deformations, tunnel faces, and arch collapse are encountered. This approach is based on the principle of combined resistance and release. A combined approach of numerical modeling and on-site surveillance was utilized to analyze the displacement and stress state of the tunnel support structure at different construction stages of primary support for the second layer, using Xiejiapo Tunnel as an engineering case. The findings indicate that the implementation of two-layer primary support can mitigate the progression of large deformations effectively in weak surrounding rock; the sooner the primary support for the second layer is applied, the better the deformation control, and the later the application takes place, the more effectively the tension in the surrounding rock is diminished, whereby the self-supporting capacity of surrounding rock comes into its own. The force of the shotcrete is reduced. Considering the structural deformation and stress state, as well as combination of resistance and release, it is best to implement the primary support for the second layer 10 feet behind the primary support for the first layer.

show abstract

Section: Introductionmentioning

confidence: 99%

Research on Double-Layer Support Control for Large Deformation of Weak Surrounding Rock in Xiejiapo Tunnel

Sun,

Li,

et al. 2024

Buildings

Self Cite

View full text Add to dashboard Cite

show abstract

“…Zou et al studied the theoretical solutions of stress, displacement and the plastic radius of a circular tunnel based on the H-B strength criterion and the non-associated flow law of elastic-brittle-plastic rock [19]. Wang et al believed that the intermediate principal stress was an important factor to determine the plastic zone; thus, the H-B strength criterion was modified by considering the intermediate principal stress, and the theoretical formula of the plastic zone radius of a rock tunnel was proposed [20]. Ranjbarnia et al developed a new analytical-numerical procedure based on the H-B strength criterion to provide the stresses and strains around a circular tunnel in rock masses exhibiting different stress-strain behaviours; a simple relationship was also presented to determine the closure of a circular tunnel in terms of the rock mass strength and tunnel depth [21].…”

Section: Introductionmentioning

confidence: 99%

Study on Stress and Displacement of Axisymmetric Circular Loess Tunnel Surrounding Rock Based on Joint Strength

Bai

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The development of an effective evaluation method suitable for loess-tunnel excavation is necessary to avoid the collapse accidents caused by tunnel excavation and any secondary disasters. Although the Fenner formulas and the modified Fenner formulas are widely used in tunnel engineering, a defect still exists in these formulas because the Mohr–Coulomb (M–C) criterion exaggerates the tensile strength of the surrounding rock of the loess tunnel. A newly modified Fenner formula was derived based on joint strength to overcome this deficiency. First, the expressions of stress and the radius of the plastic zone of the surrounding rock of the loess tunnel and the expressions of radial displacement were derived based on the stress-equilibrium equation of the axisymmetric plane and the joint strength. Then, the difference in the modified Fenner formulas based on the two kinds of strength criteria for the loess tunnel were compared. The results showed that the radius of the plastic zone and the radial displacement of the loess tunnel determined by the modified Fenner formula based on joint strength were larger than those determined by the modified Fenner formula based on M–C strength. However, the plastic stress of the plastic zone determined by the modified Fenner formula based on joint strength was smaller. The comparative analysis reveals that the modified Fenner formula based on joint strength can evaluate the stress and plastic-displacement field of the surrounding rock of a loess tunnel more reasonably.

show abstract

“…A surrounding rock loose zone refers to the stress redistribution of surrounding rock after excavation and the stress variation in surrounding rock, which leads to stress concentration. When the stress value exceeds the strength limit or yield limit, the roadway surrounding rock mass breaks up and forms a certain range of rupture area [1]. For many years, rock bolts are commonly used to enhance the stability of surrounding rock [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Predicting the Loose Zone of Roadway Surrounding Rock Using Wavelet Relevance Vector Machine

Yang

Wang

et al. 2019

Applied Sciences

View full text Add to dashboard Cite

By applying the Wavelet Relevance Vector Machine (WRVM) method, this research proposes the loose zone of roadway surrounding rock prediction. Based on the theory of relevance vector machine (RVM), the wavelet function is introduced to replace the original Gauss function as the model kernel function to form the WRVM. Five factors affecting the loose zone of roadway surrounding rock are selected as the model input, and the prediction model of the loose zone of roadway surrounding rock based on WRVM is established. By using cross-validation method, the kernel parameters of three kinds of wavelet relevance vector machines (RVMs) are calculated. By comparing and analyzing the root mean square (RMS) error of the test results of each predictive model, the advantages and accuracy of the model are verified. In practical engineering applications, the average relative prediction errors of the Mexican relevance vector machine, the Morlet relevance vector machine and the difference of Gaussian (DOG) relevance vector machine models are accordingly 4.581%, 4.586% and 4.575%. The square correlation coefficient of the predicted samples is 0.95 > 0.9, which further verifies the accuracy and reliability of the proposed method.

show abstract

Case Study of Modified H–B Strength Criterion in Discrimination of Surrounding Rock Loose Circle

Cited by 16 publications

References 10 publications

Research on Double-Layer Support Control for Large Deformation of Weak Surrounding Rock in Xiejiapo Tunnel

Research on Double-Layer Support Control for Large Deformation of Weak Surrounding Rock in Xiejiapo Tunnel

Study on Stress and Displacement of Axisymmetric Circular Loess Tunnel Surrounding Rock Based on Joint Strength

Predicting the Loose Zone of Roadway Surrounding Rock Using Wavelet Relevance Vector Machine

Contact Info

Product

Resources

About