Countermeasures to treat collapse during the construction of road tunnel in fault zone: a case study from the Yezhuping Tunnel in south Qinling, China

Wang, Yaqiong; Chang, Hongtao; Wang, Jianyu; Xiao-li, Shi; Qiu, Junling

doi:10.1007/s12665-019-8481-z

Cited by 34 publications

(5 citation statements)

References 36 publications

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“…In the course of the test, the lateral friction resistance between two adjacent sections can be considered approximately equal to the variation of the axial force of the pile body between the sections [27,[47][48][49][50]. erefore, the formula for calculating the side friction resistance of the pile is as follows:…”

Section: Pile Side Friction Calculationmentioning

confidence: 99%

Calculation of Pile Side Friction by Multiparameter Statistical Analysis

Zhou

Dong

Jiang

et al. 2019

Advances in Civil Engineering

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In this paper, a static load test and a multiparameter statistical analysis method are used to study the value of pile side friction in different soil layers in a loess region. Currently, static load testing is the most commonly used method to determine the bearing capacity of pile foundation. During the test, a vertical load is applied at the top of the pile, the data under each load level are recorded, and a Q-S curve is drawn to obtain the ultimate bearing capacity of a single pile. Reinforcement stress gauges are installed at different sections of the pile body, and then the axial force and the pile side friction of each section are calculated. Few studies have investigated the calculation of pile side friction in different soil layers using the multiparameter statistical analysis method. Obtaining accurate results using this method will provide an important supplement to the calculation of pile side friction and will also be conducive to the development of theoretical calculation of pile side friction. Therefore, taking Wuding Expressway project in loess region as an example, the lateral friction resistance of six test piles is studied through static load testing and multiparameter statistical analysis. The multiparameter statistical analysis method is compared with the static load test results, and the error is controlled within 20%. The results show that the calculation results of multiparameter statistical analysis essentially fulfill engineering requirements.

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Section: Pile Side Friction Calculationmentioning

confidence: 99%

Calculation of Pile Side Friction by Multiparameter Statistical Analysis

Zhou

Dong

Jiang

et al. 2019

Advances in Civil Engineering

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“…Active faults of different scales are widely distributed in China, especially in Western China, where fault activity is frequent 1 . With the promotion of infrastructure construction projects in the western region, such as the Sichuan–Tibet railway and the central Yunnan water-diversion project, a large number of tunnel projects are undergoing construction, and the number of tunnels crossing active fault zones is increasing.…”

Section: Introductionmentioning

confidence: 99%

Dislocation response of ECC-RC composite supporting structures of tunnels passing through active fault

Wang,

Ding,

Shi

et al. 2024

Sci Rep

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To address the problems of the conventional composite supporting structures (CCSSs) such as insufficient anti-dislocation performance and deformation capacity, this study used Engineered Cementitious Composite (ECC) lining sections instead of the traditional lining sections and optimized support design parameters, resulting in the development of novel ECC-RC composite supporting structures (ECSSs) of tunnels passing through active fault. The dislocation response characteristics and their parameter sensitivity of the ECSS was revealed by way of 1/25-scale fault dislocation model tests and finite element analysis. The test results show that the mechanical response characteristics and the failure modes of the CCSS and the ECSS are similar under reverse fault dislocation. Compared with the CCSS, the anti-dislocation performance of the ECSS is significantly improved by introducing of the ECC lining and optimizing the design parameters. The vertical deformation of the ECSS and the range of influence under the same dislocation are significantly decreased, and the strain are reduced to different degrees. This phenomenon shows that by improving the material properties, shortening the spacing of aseismatic joints and optimising the thickness of the shock absorption layer, the stress conditions and applicability under deformation of the structure are improved. The ECSS benefits from the crack resistance and toughening effect of fibres, the degree and scope of cracking of the ECSS are significantly reduced compared with those of the CCSS, and internal and external through cracks and local spalling are absent. The results of finite element analysis show that the overall damage degree of the ECSS is decreased and the damage range is increased by decreasing the strength of the surrounding rock in the fault zone. The fault dislocation response pattern of the ECSS varies depending on the fault type. The damage degree caused by different fault types follows the order of normal fault, strike-slip fault, and reverse fault from large to small. However, the damage range caused by the strike-slip fault is significantly larger compared to normal fault and reverse fault. In the design of fault resistance, the surrounding rock conditions of the fault zone and the form of fault dislocation should be considered.

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“…Subway tunneling through complex geological structures, such as active faults, has become a regular significant project; and scientific design, safe construction and disaster prevention and mitigation of related tunneling projects have become the increasing focus for tunnel contractors (Zheng, Jiang, & Li, 2013). The permanent deformation caused by relative offset between the two sides (hanging wall and footwall) of the fault plane adversely affects underground lifeline works, especially linear structures such as urban metro systems, tunnels in mountains and underground pipelines, and even results in collapse, dislocation or other destructive disasters (Wang et al, 2019;Zhang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

A model test on an open-cut tunnel structure under the effect of a stick-slip normal fault

Zhang

Zhu

Wei

2022

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PurposeLarge displacement misalignment under the action of active faults can cause complex three-dimensional deformation in subway tunnels, resulting in severe damage, distortion and misalignment. There is no developed system of fortification and related codes to follow. There are scientific problems and technical challenges in this field that have never been encountered in past research and practices.Design/methodology/approachThis paper adopted a self-designed large-scale active fault dislocation simulation loading system to conduct a similar model test of the tunnel under active fault dislocation based on the open-cut tunnel project of the Urumqi Rail Transit Line 2, which passes through the Jiujiawan normal fault. The test simulated the subway tunnel passing through the normal fault, which is inclined at 60°. This research compared and analyzed the differences in mechanical behavior between two types of lining section: the open-cut double-line box tunnel and the modified double-line box arch tunnel. The structural response and failure characteristics of the open-cut segmented lining of the tunnel under the stick-slip part of the normal fault were studied.FindingsThe results indicated that the double-line box arch tunnel improved the shear and longitudinal bending performance. Longitudinal cracks were mainly distributed in the baseplate, wall foot and arch foot, and the crack position was basically consistent with the longitudinal distribution of surrounding rock pressure. This indicated that the longitudinal cracks were due to the large local load of the cross-section of the structure, leading to an excessive local bending moment of the structure, which resulted in large eccentric failure of the lining and formation of longitudinal cracks. Compared with the ordinary box section tunnel, the improved double-line box arch tunnel significantly reduced the destroyed and damage areas of the hanging wall and footwall. The damage area and crack length were reduced by 39 and 59.3%, respectively. This indicates that the improved double-line box arch tunnel had good anti-sliding performance.Originality/valueThis paper adopted a self-designed large-scale active fault dislocation simulation loading system to conduct a similar model test of the tunnel under active fault dislocation. This system increased the similarity ratio of the test model, improved the dislocation loading rate and optimized the simulation scheme of the segmented flexible lining and other key factors affecting the test. It is of great scientific significance and engineering value to investigate the structure of subway tunnels under active fault misalignment, to study its force characteristics and damage modes, and to provide a technical reserve for the design and construction of subway tunnels through active faults.

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Countermeasures to treat collapse during the construction of road tunnel in fault zone: a case study from the Yezhuping Tunnel in south Qinling, China

Cited by 34 publications

References 36 publications

Calculation of Pile Side Friction by Multiparameter Statistical Analysis

Calculation of Pile Side Friction by Multiparameter Statistical Analysis

Dislocation response of ECC-RC composite supporting structures of tunnels passing through active fault

A model test on an open-cut tunnel structure under the effect of a stick-slip normal fault

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