Influence of Ground Temperature on Shotcrete-to-Rock Adhesion in Tunnels

Duan, Limin; Zhang, Yuanzhang; Lai, Jinxing

doi:10.1155/2019/8709087

Cited by 47 publications

(26 citation statements)

References 91 publications

(93 reference statements)

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“…To fully understand the dynamic response of the high tower during the blasting excavation and to better test the validity of the field test results, the velocity values of the measured point D under a different distance of the detonation center are obtained by using the finite element model [60][61][62]. e layout of model points is shown in Figure 5.…”

Section: Analysis Of Tower Foundationmentioning

confidence: 99%

Vibration Characteristic of High-Voltage Tower Influenced by Adjacent Tunnel Blasting Construction

Duan

Lin

Lai

et al. 2019

Shock and Vibration

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e effects of tunnel blast excavation on the adjacent existing high-voltage tower are comprehensively studied for the Chashan highway tunnel project as a case study. To investigate the effect of blast-induced vibration from the tunnel on the adjacent existing tower, field tests and numerical simulations method were adopted to study the vibration velocity and vibration frequency of the existing tower. Moreover, the relationship between the transverse distance from the detonation center and the peak velocity is discussed in detail. e results showed that the peak velocity of the measuring point in tower foundation increases with the distance between the detonation center and tower foundation approaches, and the maximum velocity is appearing when detonation center is 0 m. Furthermore, the corresponding energy spectrum distributions of the existing tower under the effect of blast induced by vibration is also analyzed, and the main frequency of vertical vibration is generally higher than that of transverse vibration. On combining the peak velocity with the main frequency and the natural frequency of the tower, the safety evaluation of the blasting area is proposed, and the corresponding control measures of blasting vibration are put forward. A guideline for the blast safety zone is proposed based on vibration velocity, main frequency, and the quantity of explosive.

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Section: Analysis Of Tower Foundationmentioning

confidence: 99%

Vibration Characteristic of High-Voltage Tower Influenced by Adjacent Tunnel Blasting Construction

Duan

Lin

Lai

et al. 2019

Shock and Vibration

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“…en, the specimens began to show clear radial dilatancy. erefore, this point was defined as the near point of creep failure for tuffaceous sandstone, and its corresponding strength represents the long-term strength of rock [50][51][52][53]. In this paper, the stable creep intersection [50] was used to calculate and determine the long-term strength of rock considering axial and radial creep rates.…”

Section: Long-term Strengthmentioning

confidence: 99%

Characteristics of Unloading Creep of Tuffaceous Sandstone in East Tianshan Tunnel under Freeze-Thaw Cycles

Zhou

Zhan

et al. 2019

Advances in Materials Science and Engineering

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e physicomechanical properties of tunnel surrounding rock are influenced by many factors such as the external environment and freeze-thaw cycles, especially in engineering in high cold regions. To understand the characteristics of freeze-thaw cycles on the creep properties of rocks in high cold regions, a freeze-thaw test, SEM test, triaxial compression test, and triaxial unloading creep test were carried out for tuffaceous sandstone in the G575 East Tianshan Tunnel in Hami, Xinjiang. e results show the following: (1) the freeze-thaw cycle reduces the degree of cementation of mineral particles in a microcosm, manifested on a macro scale by the scaling mode and crack propagation mode; (2) the effect of freeze-thaw cycles reduces the compressive strength and shear strength of rock samples (i.e., ductility enhancement); (3) for tuffaceous sandstone, the unloading process and freeze-thaw cycle each lead to improved creep deformation in rock samples, and radial deformation is more sensitive to rock deformation and failure; and (4) the creep rate of surrounding rock can be reduced by confining pressure. e peak creep rate increased with freezethaw time, as did the overall creep rate. Attention should be paid to deformation within a short period, and necessary supporting and protection measures should be taken to reduce creep.

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“…In reality, determining the viable support system is a key factor affecting the cost and safety of underground works. When a tunnel is excavated, a support system is installed to ensure the stability of the excavated underground caverns by controlling the displacement of the rock mass, so as to address the safety issues that may arise [5][6][7][8]. In recent times, an increasing number of the complex geological conditions have been confirmed in underground space development [9][10][11][12], this is especially so in the squeezing ground areas which have resulted in a series of tunnel construction problems such as extreme deformation, support structure failure or even collapse, and examples can be easily found in the Zhegushan and Laodongshan tunnels in China [13,14], tunnel 35 of the Ankara-Istanbul high-speed railway project in Turkey [15], and Kaligandaki tunnel in Nepal [16].…”

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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Influence of Ground Temperature on Shotcrete-to-Rock Adhesion in Tunnels

Cited by 47 publications

References 91 publications

Vibration Characteristic of High-Voltage Tower Influenced by Adjacent Tunnel Blasting Construction

Vibration Characteristic of High-Voltage Tower Influenced by Adjacent Tunnel Blasting Construction

Characteristics of Unloading Creep of Tuffaceous Sandstone in East Tianshan Tunnel under Freeze-Thaw Cycles

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

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