Investigation into geohazards during urbanization process of Xi’an, China

Wang, Zhifeng; Cheng, Wen-Chieh; Wang, Yaqiong

doi:10.1007/s11069-018-3280-5

Cited by 68 publications

(28 citation statements)

References 60 publications

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“…Relevant experts and scholars have basically conducted research on this part based on simulation experiments. Currently, most of the relevant experimental ideas are as follows: by simulating the actual hightemperature geothermal environment, changing the temperature and humidity conditions, and conducting field tests under other conditions with constant interference factors [18,29,30]. e test mainly uses the splitting method and the core drawing method to measure and analyse the adhesion strength of shotcrete-to-rock.…”

Section: Effect Of Temperature and Humidity On Adhesion Strength Of Smentioning

confidence: 99%

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

Duan

Zhang

Lai

2019

Advances in Materials Science and Engineering

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Long and deep tunnels are increasingly designed and built worldwide, often in severe geothermal environments characterized by high temperature in the rocks. is issue cannot be ignored because high temperature definitely affects the strength of the adhesion between the concrete and the surrounding rocks, whatever the lining cast in place, segmental or sprayed using shotcrete. e causes of geothermal heat and the effect of the temperature on tunnel linings during and after their construction are recalled and discussed in this paper. Both temperature and humidity are shown to be the most relevant factors affecting adhesion strength, whose loss is related to the microdamage in the shotcrete layers closest to the rock. Possible ways to improve adhesion strength and to minimize the high-temperature detrimental effect are also presented and discussed.

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Section: Effect Of Temperature and Humidity On Adhesion Strength Of Smentioning

confidence: 99%

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

Duan

Zhang

Lai

2019

Advances in Materials Science and Engineering

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“…However, for the case of analyzing the ground settlement caused by single tunnel construction under the e ect of existing two tunnels, this method has not been adopted. In this study, the ground settlement of GMP4-1∼5 was calculated by using Formula (2). In order to facilitate the study, referring to the characteristic of the curve, all values are tted after adding 19.…”

Section: Ground Settlementmentioning

confidence: 99%

“…Meanwhile, there are also a numerous number of tunnels that need to be expanded urgently to meet existing operating demands. Surface deformation during and after construction is a considerable topic, and there will be many factors causing deformation [1][2][3][4][5][6]. Ground settlement induced by tunnel excavation has been studied extensively [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Expanding a Rectangular Tunnel on Adjacent Structures

Wang

Kong

Wang

2018

Advances in Civil Engineering

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e expansion of urban underpass has become the mainstream of development to cope with urban congestion, and the effect on adjacent existing structures during enlarging construction is also an important issue in the construction process. In order to better understand the influence of tunneling on adjacent structures, the pedestrian underpass expanding project above-crossing Xi'an Metro Line 1 was investigated. e aim was to analyze the deformation curves characteristics of adjacent structures by field observation of ground settlement, heave of existing tunnels, and settlement of piles. e results show that the ground settlement curve in the vertical direction of the underpass is similar to the shape of V, and the maximum settlement appearing in the center line of underpass is 18.7 mm. Due to the effect of existing tunnels on the ground deformation, the settlement curve in the parallel direction of the underpass is similar to the shape of M. Above-crossing tunneling would cause the existing tunnels to heave, and the heave mainly occurs in the range of −6 m to 12 m between the pedestrian tunnel face and the center line of each tunnel. e heave curve is similar to the shape of inverted U. e settlement of piles is linear with its axial stress and significantly affected by its location. e settlement curve of piles is similar to the shape of S in two dimensions. On the basis of deformation curves, this paper presents some equations to describe the shape of V, M, inverted U, and S, respectively, by the inverted Gaussian distribution curve, superimposed Gaussian distribution curve, Gaussian distribution curve, and arctangent function.

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“…In China, at present, the construction of mountain tunnels mainly adopts the drilling and blasting method which is a preferred method of rock excavation worldwide due to low initial investment, cheap explosive, and possibility to deal with different complex geologies [8][9][10]. Although the drilling and blasting method have been widely used in underground construction, the stability of mountain body and surrounding environment has been inevitably disturbed, and the groundwater system of the mountain has been greatly affected during blasting excavation, which could increase the risk of construction safety [11][12][13][14][15][16]. For shallow-buried tunnels, surface vibration caused by drilling and blasting is relatively large to reduce the impact of blasting on surrounding buildings, and ground vibration caused by blasting in the process of tunnel construction should be reasonably controlled.…”

Section: Introductionmentioning

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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Investigation into geohazards during urbanization process of Xi’an, China

Cited by 68 publications

References 60 publications

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

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

Effect of Expanding a Rectangular Tunnel on Adjacent Structures

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

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