Model test study on vibration blasting of large cross-section tunnel with small clearance in horizontal stratified surrounding rock

Song, Shuguang; Li, Shucai; Li, Liping; Shi, Shaoshuai; Zhou, Zongqing; Liu, Zhenhua; Shang, Chengshun; Sun, Haozheng

doi:10.1016/j.tust.2019.103013

Cited by 74 publications

(22 citation statements)

References 3 publications

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“…e failure glide planes were also found to extend from the arch foot to the surface at an inclination of approximately 70°, which is consistent with a previous report [22]. Additionally, by means of physical detection and pit exploration, the failure glide planes in the surrounding rock were found to extend from the arch waist to the surface at an inclination of 64.3° [23].…”

Section: Project Overviewsupporting

confidence: 90%

Load Characteristics of Tunnel Lining in Flooded Loess Strata considering Loess Structure

Liu

Lai

2019

Advances in Civil Engineering

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Loess has a unique structure and water sensitivity, and the immersion of loess leads to many tunnel lining problems in shallowly buried tunnels. Based on a tunnel in Gansu Province in China, two failure glide planes of a shallowly buried loess tunnel and their immersion modes are summarized. Finite element calculation of the structural Duncan-Chang constitutive model is realized via the secondary development of finite element software, by which the loads on the secondary lining are calculated and verified in comparison with measured results. The load characteristics of the secondary lining are studied. The load evolution is closely related to the immersion position and scope of the load. After the loess near the failure glide plane of the arch foot is flooded, the load on the arch foot sharply increases. As the immersion expands, the maximum load moves from the arch end up to the hance. After the loess near the failure glide plane of the hance is flooded, the load on the hance decreases slightly. The stability of the overlying loess decreases gradually, which causes the loads on the vault and arch shoulder to rapidly increase. Additionally, the load distribution characteristics on the secondary lining are summarized.

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Section: Project Overviewsupporting

confidence: 90%

Load Characteristics of Tunnel Lining in Flooded Loess Strata considering Loess Structure

Liu

Lai

2019

Advances in Civil Engineering

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“…At present, the main construction methods for largespan loess tunnel are the bench method [17,18], the central diaphragm method (CD) [19], the cross diaphragm method (CRD) [20][21][22], and the two-side pilot hole method [23,24]. However, the engineering practice of large-span loess tunnel shows that the above four construction methods cannot meet the requirements of deformation control and construction efficiency at the same time.…”

Section: Introductionmentioning

confidence: 99%

Study of Deformation Behaviors and Mechanical Properties of Central Diaphragm in a Large‐Span Loess Tunnel by the Upper Bench CD Method

Luo

Shi

Chen

et al. 2020

Advances in Civil Engineering

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The central diaphragm is often used to reduce the span to maintain the stability and safety of structure in the construction of large-span loess tunnel due to the structure complexities. In this paper, relying on the field monitoring and measurement for Wangcun tunnel in Huangling-Yan’an expressway expansion project, the crown settlement and horizontal convergence of primary support steel rib and central diaphragm steel rib during the construction are analyzed by the upper bench CD method. According to the internal force transfer, deformation coordination, and arch foot displacement between the two structures, the support system is regarded as the arch-beam fixed structure with three times of statically indeterminate and movable abutment under the loads, and the mechanical calculation model of sidewall steel rib and the central diaphragm structure bearing loads and deformation together is established. Finally, through the mechanical model mentioned above, the deformation characteristics of central diaphragm structure and the horizontal convergence in the upper bench of tunnel are calculated and analyzed. The research shows the following: (1) the accumulated settlement of sidewall steel rib in Part I is greater than that of the sidewall steel rib in Part II, and the accumulated settlement of each part at the support structure during the tunnel excavation is less than the reserved deformation of 150 mm specified in the tunnel excavation; (2) the settlement located at the waist and maximum excavation line position of central diaphragm is mainly affected by the excavation of Parts I and II in upper bench; (3) during the whole excavation process, the excavation of Part I and Part II has the greatest influence on the convergence at arch waist and the maximum excavation line position in Part I, and the convergence at the above two positions all experienced four stages of “convergence-expansion-convergence-gradual stability”; and (4) the errors between the horizontal convergence and the deformation of central diaphragm obtained by the mechanical model and the field monitoring data are between 12.7% and 27.5%. The calculated results are in good agreement with the actual situation. The research can provide a theoretical basis for the study of deformation and mechanical properties for support structure in the construction of large-span loess tunnel by the upper bench CD method.

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“…In the process of underground excavation, the combined support system consists of steel arch and shotcrete is the primary support structure to close the fracture of rock mass, to maintain its stability, and to mobilize its self-bearing strength (Figure 1) (Bjureland et al, 2019; Carranza-Torres and Diederichs, 2009; Oreste et al, 2018; Song et al, 2019; Vojtasik et al, 2017). However, the steel-concrete bond-slip behavior is generally considered to be one of the decisive factors affecting the failure mechanism of composite structures (Kabir et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Study on support characteristic curve of primary support structures in underground excavation considering bond-slip behavior

Lü

Sun

2020

Advances in Structural Engineering

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Steel reinforced shotcrete lining (SRSL) support is the primary structure to maintain the stability and mobilize the self-bearing capacity of surrounding rock. However, the structural design of SRSL in underground excavation still relies on experience-based method and lack of quantitative mechanical analysis. This paper aims to propose a modified analytical model of support characteristic curve (SCC) that represents the mechanical behavior of SRSL structures in underground construction, through which the interface bond-slip behavior between steel arch and shotcrete layer is taken into consideration. Four-point bending test of SRSL composite beam was carried out to study the bearing mechanism and failure performance. Test results show that the shotcrete-steel interface is prone to slip failure which significantly reduces the overall strength of SRSL. The laboratory test is complemented by non-liner finite element parametric studies considering the bond-slip properties to clarify the design principles and to obtain the flexural stiffness of tunnel primary lining structures. Based on above studies, the simplified formulas for the SCC of SRSL is constructed. The research results provide a theoretical basis for the design and application of SRSL structure in related projects.

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Model test study on vibration blasting of large cross-section tunnel with small clearance in horizontal stratified surrounding rock

Cited by 74 publications

References 3 publications

Load Characteristics of Tunnel Lining in Flooded Loess Strata considering Loess Structure

Load Characteristics of Tunnel Lining in Flooded Loess Strata considering Loess Structure

Study of Deformation Behaviors and Mechanical Properties of Central Diaphragm in a Large‐Span Loess Tunnel by the Upper Bench CD Method

Study on support characteristic curve of primary support structures in underground excavation considering bond-slip behavior

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