An in-tunnel grouting protection method for excavating twin tunnels beneath an existing tunnel

Jin, Dalong; Yuan, Dajun; Li, Xinggao; Zheng, Haotian

doi:10.1016/j.tust.2017.08.002

Cited by 111 publications

(35 citation statements)

References 11 publications

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“…The maximum offset of the CWO sewer is pushed in the diagonal axis which is detected when the tunnel face advancement is ahead of the point A by approximately 24 m or 39 m behind the tunnel. The observed trend of the CWO deformation matched with the documented by Jin, Yuan, Li and Zheng (2018).…”

Section: Cwo Sewer Settlementsupporting

confidence: 86%

“…The construction of two closely distant tunnels under an existing tunnel can cause greater deformation for the existing tunnel and the ground due to the dual disturbances caused by the tunneling process (Jin, Yuan, Li & Zheng, 2018). Several studies have estimated the ground movements as well as the deformation has induced in the existing tunnels by the construction of a new tunnel (Fang, Zhang, Li & Wong, 2015;Zhang, Liu, Kang, Zhong & Chen, 2018;Lin, Chen, Wu & Cheng, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Minimizing of tunneling effect on existing infrastructure in Egypt

Asker

Fouad

Bahr

et al. 2021

srees

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A set of parametric studies by using the Abaqus software is conducting to investigate the effective method to seal the CWO sewer from the tunneling process. These methods include: (i) two deep grouted walls, (ii) adjacent slurry piles, (iii) bored reinforced concrete piles assisted with slurry piles, and (iv) grouted block confining the twin tunnel wall. Based on the results of parametric studies. Most of the protective studied technique was effective on reducing the tunneling effect on the ground movements.

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Section: Cwo Sewer Settlementsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Minimizing of tunneling effect on existing infrastructure in Egypt

Asker

Fouad

Bahr

et al. 2021

srees

View full text Add to dashboard Cite

show abstract

“…Employing PLAXS software numerical analysis, Vinod and Khabbaz [8] studied the surface settlements and bending moments of circular and rectangular twin tunnel linings, where the key research parameters included the relative position, critical distance, volume loss, overburden, and size of the twin tunnel.…”

Section: Introductionmentioning

confidence: 99%

Numerical Parametric Study of Countermeasures to Alleviate the Tunnel Excavation Effects on an Existing Tunnel in a Shallow-Buried Environment near a Slope

et al. 2020

Applied Sciences

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This paper studies the influence law of existing tunnels on the construction of intersecting new tunnels in a shallow slope burial context through 3D numerical analysis. The emphasis is on exploring the effect of new tunnels constructed in 54 conditions, including three ratios of overburden to tunnel height (C/H), three ratios of slope distance to tunnel span (D/W), two backfilling conditions of the existing tunnel (“hty” and “htn” conditions), and three magnitudes of surface loads (10 kPa, 20 kPa, and 30 kPa), on the deformation of lateral slopes and the overlying road. As the results show, the rigidly separated area between the existing and newly built tunnels in parallel to the excavation direction was precisely the sensitive area affected by the existing tunnel backfilling condition. The road settlement simulations perpendicular to the excavation direction revealed that various C/H and D/W ratio combinations controlled the shape and size differences of the settlement trough curve. This was because the C/H ratio primarily controlled the effective span and height transition of the newly built tunnel, whereas the D/W ratio mainly controlled the intersection position of the tunnels. Next, model A-A (“hty” condition) was identified as the only feasible construction model among all models in accordance with the engineering safety control criteria. Lastly, comparison of monitoring data with simulations found a slight difference in the distribution pattern between the two. Nevertheless, the final maximum settlement fully satisfied the construction control requirements overall. Aside from proving the correctness of simulation results, the present study also sets an excellent referential example for similar projects.

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“…Jin et al [7] found that in an existing tunnel using double-tunnel grouting protection method, a tunnel grouting method, and combining with shield method, can effectively reduce the double underground tunnel construction influence on existing tunnel and on the settlement and stress of the tunnel monitoring system, but the scope of this method is limited and can be applied only to tunnel grouting. Ping et al [8] proposed a leakage plugging method with low-heat asphalt grouting, whose construction temperature is less than 80°C.…”

Section: Introductionmentioning

confidence: 99%

Development and experimental research of a low-thermal asphalt material for grouting leakage blocking

Huang

Xing

2020

High Temperature Materials and Processes

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Tunnel water burst is among the common severe geological hazards in deep buried tunnel projects in China and throughout the world. Asphalt grouting is an effective method to block seepage channels in macroporous strata under the condition of flowing water, but it has defects such as a high heating temperature, complex high-temperature construction technology, and poor controllability during the grouting process. A type of “water-in-oil” low-thermal asphalt was developed in this study. It can cool and solidify and not be diluted when encountering water, and its construction temperature can be below 80°C. Experimental research on the physical and mechanical properties of the low-thermal asphalt leakage-blocking material was completed, including proportion experiments, fluidity, sensitivity to temperature, one- and two-dimensional indoor diffusion experiments, and impact experiments, which presented its physical and mechanical properties and can provide guidance for the application of the material in site projects.

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An in-tunnel grouting protection method for excavating twin tunnels beneath an existing tunnel

Cited by 111 publications

References 11 publications

Minimizing of tunneling effect on existing infrastructure in Egypt

Minimizing of tunneling effect on existing infrastructure in Egypt

Numerical Parametric Study of Countermeasures to Alleviate the Tunnel Excavation Effects on an Existing Tunnel in a Shallow-Buried Environment near a Slope

Development and experimental research of a low-thermal asphalt material for grouting leakage blocking

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