Bridging the gap between engineering properties and grouting reinforcement mechanisms for loess in eastern China: taking Jinan loess as an example

An, Qiyi; Zhang, Qingsong; Xiao, Zhenggang; Zhang, Jiaqi

doi:10.1007/s10064-021-02201-w

Cited by 11 publications

(3 citation statements)

References 40 publications

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“…Cases of collapse in tunnels usually occur due to unstable conditions of the surrounding environment, either due to groundwater seepage [1], geological conditions [2][3], or due to excavation methods and inappropriate support systems [4][5]. The collapse during excavation generally begins with the deformations around the rock excavated and still has no support system.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Tunnel Face Failure during the Excavation and Evaluation of Excavation Method and Sequential on Ciuyah Tunnel, Lebak Regency, Banten Province

Bismoseno,

Indrawan,

Junica

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The difference in geological and geotechnical conditions during design and implementation are frequent due to the lack of data collection and diverse rock variations. An important step in designing the excavation method, stages, and support system are determining the rock mass’s actual condition. Inaccuracy in evaluating rock mass quality can cause a collapse during tunnel excavation. This study used an example of a collapse case on the inlet side of the Ciuyah tunnel. The classification system used in the design was the JSCE 1975, but collapses occurred at several locations during excavations. An additional assessment of the tunnel stability was carried out by doing surface surveys and evaluations in STA 0+123 using the RMR89, GSI, and JSCE 2016 classification systems. The rock mass in this location consists of tuffaceous claystone and tuffaceous sandstone with very poor quality. The empirical evaluation showed that Daraei’s multigraph could be used to determine the collapse pattern for very poor rock. For the excavation method, stages, and support systems, it is preferable to apply the RMR classification system with consideration for the maximum stand-up time. This research aims to provide information that may be used for other projects with similar geological circumstances.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Tunnel Face Failure during the Excavation and Evaluation of Excavation Method and Sequential on Ciuyah Tunnel, Lebak Regency, Banten Province

Bismoseno,

Indrawan,

Junica

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Therefore, the stability of the tunnel needs to be considered in the design [1]. Mishandling of geological conditions [2][3], errors in monitoring groundwater conditions [4], or improper excavation methods and support systems [5][6] can cause tunnel collapse. Consequently, ensuring that the tunnel design is compatible with engineering geology conditions is vital.…”

Section: Introductionmentioning

confidence: 99%

Empirical analyses of the excavating method and support system based on engineering geology of the Rukoh Dam Suppletion Tunnel, Pidie Regency, Aceh Province, Indonesia

Bangkit Harwinda,

Wilopo,

Indrawan

2023

E3S Web Conf.

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In the design of the Rukoh Dam Suppletion Tunnel, the rock mass quality had not yet been evaluated. Whereas the evaluation empirically affects the stability and support system of the tunnel. This research aimed to provide recommendations for excavation methods and support systems in tunnel construction based on the RMR and Q-System methodologies. The research investigation was conducted by surface geological mapping and assessing the rock mass quality from drill points. The results showed that the tunnel area consists of calcareous siltstone. Meanwhile, the tunnel axis consisted of poor-quality calcareous siltstone based on the RMR value. Following the Q-value, the quality of the calcareous siltstone ranges from very poor to extremely poor. Based on empirical analysis, the tunnel's excavation methods were the top heading and bench methods with 0.6 to 10.0 hours of stand-up time. The proposed support systems analyzed from RMR and Q-value were rock bolt, wire mesh, shotcrete, and steel sets. This analysis had implications for minimizing the risk of failure at the tunnel site due to poor rock mass quality. Even though an empirical method aids in the design, numerical studies are required to bolster the recommendations.

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“…Loess-reinforcing techniques to create better pavements based on conventional stabilizers, such as cement and lime, have become more mature due to long-term progress and practices [8][9][10]. However, the productions of these materials are energy-intensive, result in high CO 2 emissions, and are becoming increasingly expensive.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cyclic Freezing–Thawing on Dynamic Properties of Loess Reinforced with Polypropylene Fiber and Fly Ash

Chen

Luo

et al. 2022

Water

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Periodic freezing–thawing is recognized as a real threat to the mechanical properties of reinforced loess, which has been used in the recent construction of high-speed railways in northwest China; however, the performance of these materials under periodic freezing–thawing and dynamic loading has rarely been investigated. In this work, dynamic triaxial tests were conducted on fly ash- and polypropylene fiber-reinforced loess with different blend ratios and freeze–thaw cycles. The dynamic shear modulus and damping ratio were investigated. The results revealed that cyclic freezing–thawing had a remarkable effect on the dynamic shear modulus and damping ratio, which demonstrated considerable reductions and increases, respectively, after cyclic freezing–thawing. Additionally, the dynamic shear modulus increased notably with the fly ash content and confining pressure and decreased with the water content. Meanwhile, the damping ratio increased with the fiber content and water content and decreased with the fly ash content and confining pressure. Comparatively, the effects of polypropylene fiber on dynamic behavior were found to be not significant. Furthermore, novel models were established to predict the dynamic shear modulus and damping ratio for reinforced loess. The results provide more information towards infrastructure design in seasonal frozen regions.

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Bridging the gap between engineering properties and grouting reinforcement mechanisms for loess in eastern China: taking Jinan loess as an example

Cited by 11 publications

References 40 publications

Analysis of the Tunnel Face Failure during the Excavation and Evaluation of Excavation Method and Sequential on Ciuyah Tunnel, Lebak Regency, Banten Province

Analysis of the Tunnel Face Failure during the Excavation and Evaluation of Excavation Method and Sequential on Ciuyah Tunnel, Lebak Regency, Banten Province

Empirical analyses of the excavating method and support system based on engineering geology of the Rukoh Dam Suppletion Tunnel, Pidie Regency, Aceh Province, Indonesia

Effects of Cyclic Freezing–Thawing on Dynamic Properties of Loess Reinforced with Polypropylene Fiber and Fly Ash

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