A New Close-Form Solution for Elastoplastic Seepage-Induced Stresses to Circular Tunnel with Considering Intermediate Principal Stress

Zhao, Yu; Tao, Wei; Wang, Chaolin; Bi, Jing

doi:10.1007/s00603-023-03399-9

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…When the normal stress value was 50 kPa, the effect of the relative density on the shear strength of sand–concrete interfaces was not obvious; however, as the normal stress was augmented, the impact of the relative density was significant [ 21 ]. It can thus be seen from Figure 8 that the shear strength curves (the fitting curves) could be represented by straight lines, thereby establishing that the shear failure value of the sand–concrete interfaces conformed to the Mohr Coulomb strength criterion [ 22 , 23 ]. As it is generally well known that sand comprises very low cohesion values [ 17 ], the cohesion values of the five types of sand–concrete interfaces were all taken in such a manner as to fit with the cohesion value of the sand–smooth concrete interface.…”

Section: Resultsmentioning

confidence: 78%

Effects of Interface Morphology on the Shear Mechanical Properties of Sand–Concrete Interfaces

Li,

Meng,

Shen

2023

Materials

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The morphology of the contact surface between cast-in-place engineering structures and soil is generally random. Previous research focusing on the shear mechanical properties of soil–concrete interfaces has predominantly concentrated on the role of interface roughness by constructing regular concrete surface types, largely neglecting the potential impact of the roughness morphology (i.e., the morphology of the concrete surface). In this study, concrete blocks with the same interface roughness and different roughness morphologies were constructed based on the sand-cone method, including random rough surface, triangular groove surface, rectangular groove surface, trapezoid groove surface, and semicircular groove surface. A series of direct shear tests were conducted on the rough and smooth sand–concrete interfaces, as well as on natural sand. Through these tests, we examined the shear mechanical behavior and strength of the sand–concrete interfaces, and analyzed the underlying shear mechanisms. The results showed that: (i) the interface morphology had little effect on the variation in the shear stress–displacement curve of sand–concrete interfaces, and it had a significant influence on the shear strength of the interfaces; (ii) under the same normal stress, the shear strength of the sand–concrete interfaces with a random rough surface was the greatest, followed by the triangular groove surface, while the shear strength of the rectangular groove surface proved the lowest; (iii) the shear strength of the sand–concrete interfaces with the same roughness was affected by the size of the contact area between the concrete plane and the sand, that is, a larger contact area correlated with a decrease in shear strength. It can be concluded that the shear strength value of a sand–concrete surface with the triangular groove is the closest to the shear strength of a random rough interface. By gaining a deep understanding of the effects of different contact surface morphologies on shear strength and shear behavior, significant insights can be provided for optimizing engineering design and enhancing engineering performance.

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Section: Resultsmentioning

confidence: 78%

Effects of Interface Morphology on the Shear Mechanical Properties of Sand–Concrete Interfaces

Li,

Meng,

Shen

2023

Materials

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“…By using Eq (11), the optimal expected values of e L , e A , and X can be obtained. If Q L and Q A satisfy Eq (10), it means that this is an equal-weighted TLS; as such, the weights can be disregarded.…”

Section: Plos Onementioning

confidence: 99%

“…Lin and Zhou [10] studied the permeability of coal sample gas by simulating the in-situ stress environment, and obtained the relationship between coal gas permeability and in-situ stress. Zhao et al [11] conducted a coal sample permeability test under three-dimensional stress and revealed the influence of three-dimensional stress and coal adsorption on the coal gas seepage law. Tang et al [12] obtained the relationship between permeability and effective stress by studying the desorption and migration laws of coal seam gas during the simulated gas drainage process.…”

Section: Introductionmentioning

confidence: 99%

Calculation and program realization of coal pillar setting parameters in Huainan mining area

Yang

2024

PLoS ONE

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Coal pillar retention plays a crucial role in ensuring safety and minimizing ground deformation in coal mining operations. However, accurately and efficiently determining the optimal size of protective pillars, reducing coal pillar pressure, and addressing challenges such as limited access to retention parameters, lengthy observation times, and high labor costs are challenges that must be addressed. In this paper, we presented a methodology using Huainan mine as a case study to address these challenges. The solution involves deriving the formula for coal pillar retention parameters based on the Three Regulations definition and requirements. The total least squares algorithm was integrated with surface observation station data and the MATLAB software platform to automate the coal pillar retention solution. Furthermore, a linear regression model of coal pillar retention-related parameters was established using the geological mining condition data. The proposed ELM neural network model was optimized using a genetic algorithm and combined with the linear regression model to establish a predictive model. The results demonstrated that the proposed machine learning algorithm attains the requisite level of accuracy for industrial production.

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“…There are few studies on the equivalent M-C parameters of the threedimensional strength criterion. Since the strength of the rock mass is significantly affected by the intermediate principal stresses and is interzonal, [9][10][11][12][13][14] it is essential to find an equivalent method based on a three-dimensional state. Based on a method proposed by the author 15 for calculating the instantaneous equivalent M-C parameters of the three-dimensional H-B strength criterion from the meridian plane, the influence rule of intermediate principal stress on the strength parameters of rock mass is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Study of slope stability analysis method based on equivalent Mohr‐Coulomb strength parameters of three‐dimensional stress state

Wu,

Xia,

Han

et al. 2024

Num Anal Meth Geomechanics

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Most rock slope stability analysis methods are based on the Hoke–Brown criterion under a two‐dimensional state of stress, which somewhat ignores the effect of intermediate principal stress. In this paper, by introducing the improved three‐dimensional H‐B criterion into the Meridian plane, the tangent line of a point on the H‐B strength envelope is regarded as its instantaneous equivalent M‐C parameter. Based on this, a formula for solving the equivalent M‐C strength parameters under a three‐dimensional stress state is established to describe the shear strength parameters of rock mass, considering different stress states. Taking three kinds of rocks as examples, the influence of the intermediate principal stress on their strength parameters is analyzed. On this basis, the realization scheme of the nonlinear strength reduction method is established, the stability of the slope is studied, and an example verifies the feasibility of this method. This method fully considers the nonlinear characteristics of rock slope strength parameters under a three‐dimensional stress state and provides a solid basis for slope stability analysis.

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A New Close-Form Solution for Elastoplastic Seepage-Induced Stresses to Circular Tunnel with Considering Intermediate Principal Stress

Cited by 4 publications

References 28 publications

Effects of Interface Morphology on the Shear Mechanical Properties of Sand–Concrete Interfaces

Effects of Interface Morphology on the Shear Mechanical Properties of Sand–Concrete Interfaces

Calculation and program realization of coal pillar setting parameters in Huainan mining area

Study of slope stability analysis method based on equivalent Mohr‐Coulomb strength parameters of three‐dimensional stress state

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