Study on a Surrounding Rock Pressure Calculation Method for Super-Large Section Highway Tunnels

Gao, Hongjie; He, Ping; Zheng, Chuanchao; Li, Xinyu

doi:10.3390/sym11091133

Cited by 17 publications

(8 citation statements)

References 12 publications

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“…The complex behavior of soft rocks and problems related to their classification, sampling, and testing, lead to the need for better understanding of the soft rock properties and finding adequate solutions for the related problems. Accordingly, many authors have previously dealt with soft rock problems, such as Živec et al [28], Gao et al [29], and Auflič et al [30], and the correlations between their properties [8,31].…”

Section: Discussionmentioning

confidence: 99%

Marly Soft Rocks: Correlation of Physical and Mechanical Properties—Examples from Dalmatia (Croatia) and Budapest (Hungary)

et al. 2022

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Soft rocks in various forms of marly materials have an important role in the geological structure of Dalmatia (Croatia) and Budapest region (Hungary). These materials can cause serious problems in design and construction, due to their complex behavior under atmospheric conditions. For the purpose of better understanding soft rocks behavior and their properties, a database with approximately 600 samples collected throughout Dalmatia was made and collated along with 260 samples from the Budapest area. Based on the collected data, 30 regression analyses were performed among 14 material properties, and eight different types of linear and non-linear correlations with high coefficients of determination were selected, which connect the important mechanical properties (uniaxial compressive strength and Young’s modulus) with physical properties of marls (porosity, dry unit weight, and ultrasonic pulse wave velocity). Most of the determined relations show symmetry between the marls from the Dalmatian region and the Budapest region, and the relation between dry unit weight and uniaxial compressive strength asymmetry can be observed between the marls with different origins. Obtained correlations may be used in cases where little or no information on geotechnical parameters is available, or where results need to be verified due to the problems present in soft rock testing.

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Section: Discussionmentioning

confidence: 99%

Marly Soft Rocks: Correlation of Physical and Mechanical Properties—Examples from Dalmatia (Croatia) and Budapest (Hungary)

et al. 2022

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“…On the other hand, in-situ stress and geomechanical properties of the surrounding rock mass can also be determined based on the information on rock deformation and failure at a borehole [5,6]. In addition, support stress also plays an important role in actual practice [7,8]. Therefore, the elastic-plastic-damage analysis of the surrounding rock has important engineering significance.…”

Section: Introductionmentioning

confidence: 99%

Elastic-Plastic-Damaged Zones around a Deep Circular Wellbore under Non-Uniform Loading

Shang

Zhang

2020

Symmetry

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Wellbores are largely constructed during coal mining, shale gas production, and geothermal exploration. Studying the shape and size of the disturbed zone in surrounding rock is of great significance for wellbore stability control. In this paper, a theoretical model for elastic-plastic-damage analysis around a deep circular wellbore under non-uniform compression is proposed. Based on the elastoplastic softening constitutive model and Mohr-Coulomb strength criterion, the analytical expressions of stresses in the elastic, plastic and damaged zones around a circle wellbore are derived. Further, the boundary line equations among the three zones are obtained according to the conditions of stress continuity. Then, the influence rules of non-uniform in-situ stress and mechanical parameters on the stress distribution and plastic zone size in surrounding rock mass are analyzed. The plastic and the damaged zones are both approximately elliptical in shape. When the lateral stress coefficient of the in-situ stress field takes the value 1, the model degenerates into the Yuan Wenbo’s Solution. If the brittleness coefficient of the surrounding rock is 0, the model degenerates into the Kastner’s Equation. Finally, the results are compared with those under two special cases (in the elastoplastic softening rock under a uniform stress field, in the ideal elastoplastic rock under a non-uniform stress field) and a common approximation method (the perturbation method).

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“…In 2019, Gao et al [17] analyzed numerical simulation results, introduced the span term into the method of calculating surrounding rock pressure based on the Q system, and proposed a method that can quickly estimate the surrounding rock pressure of tunnels. Based on the summary of the calculation methods of tunnel load and surrounding rock pressure, and considering the calculation process, we analyzed the influencing factors, the different surrounding rock conditions, and the applicable conditions of various correlations, and the results are presented in Table 1.…”

Section: Introductionmentioning

confidence: 99%

A Novel Calculation Method of Process Load for Extra-Large Section Tunnels

Gao

Chen

et al. 2019

Symmetry

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The calculation of load and surrounding rock pressure of extra-large-section tunnels serves as an important premise for the design and construction of tunnel projects with extra-large sections. Based on the large-span section of the Shenzhen Liantang Tunnel (China), which is the largest highway tunnel in the world to date, this paper discusses the challenges existing in the calculation method of state load and surrounding rock pressure for extra-large-section tunnels and puts forward a novel calculation method for process load, which is suitable for extra-large-section highway tunnels. In the current work, we derived the related application correlations and improved the specific application steps, methods, and project models of the proposed calculation method. Both the rationality and feasibility of the calculation method were verified from a practical perspective by comparing the on-site data of surrounding rock pressure at the Liantang Tunnel with the calculated load, which provides a fundamental basis for the process design of tunnels.

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Study on a Surrounding Rock Pressure Calculation Method for Super-Large Section Highway Tunnels

Cited by 17 publications

References 12 publications

Marly Soft Rocks: Correlation of Physical and Mechanical Properties—Examples from Dalmatia (Croatia) and Budapest (Hungary)

Marly Soft Rocks: Correlation of Physical and Mechanical Properties—Examples from Dalmatia (Croatia) and Budapest (Hungary)

Elastic-Plastic-Damaged Zones around a Deep Circular Wellbore under Non-Uniform Loading

A Novel Calculation Method of Process Load for Extra-Large Section Tunnels

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