Numerical Modelling of Tunnels Excavated in Squeezing Ground Condition: A Case Study

Majumder, Dipaloke; Viladkar, M.N.; Singh, Mahendra

doi:10.1007/s13369-022-07098-5

Cited by 4 publications

(1 citation statement)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using an anchor rod support is one of the most commonly employed techniques in the field of geotechnical support [1,2]. In tunnel construction, under the conditions of a significant burial depth, high stress, soft rock, and fractured surrounding rocks, [3,4] the requirements of the anchoring force and load-bearing capacity of rock bolts are significant for the stability control of the surrounding rocks in the tunnel. Currently, prestressed anchor bolts are widely used as critical active support systems in tunnel construction involving high stresses and fractured surrounding rocks.…”

Section: Introductionmentioning

confidence: 99%

Performance of the Cement Grouting Material and Optimization of the Mix Proportion for the Free Section of the Prestressed Anchor Bar

Wu,

Chen,

Zhang

et al. 2023

Materials

View full text Add to dashboard Cite

Increasing the water–cement ratio and water-reducer dosage of cement slurry enhances its fluidity. However, a high water–cement ratio diminishes the beneficial effects of water reducers on fluidity. The stone content of the slurry decreases as the water-reducer dosage increases. Additionally, the water–cement ratio significantly affects stone content. However, when the water–cement ratio exceeds a threshold value, stone content decreases. Furthermore, the threshold value of the water–cement ratio decreases with increasing water-reducer dosage. Without the addition of the water reducer, as the water–cement ratio increases the overall integrity of the grout stone decreases. The addition of the water reducer alters the surface pore distribution, wherein “uniform small pores” change to “localized large pores.” Based on the multi-objective optimization of Matlab, the recommended optimal mix composition for a slow-setting cement slurry is a water–cement ratio of 0.25 and water-reducer dosage of 1.5%. With the use of this optimized mix composition, the stone content and compressive strength increase by 7.8% and 145.6%, respectively, compared to those obtained using the recommended mix ratio in the specifications. Additionally, all relevant performance parameters meet the requirements specified by previous standards.

show abstract