Prediction Model for Performance Evaluation of Tunnel Excavation in Blocky Rock Mass

Roy, Nishant; Sarkar, Rajib; Bharti, Shiv Dayal

doi:10.1061/(asce)gm.1943-5622.0001023

Cited by 10 publications

(2 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is often a "tunnel-slope" interaction at the entrance and exit of the tunnel when the tunnel is under construction [1]. Tunnel excavation destroys the stress balance and reduces the stability greatly [2]; in case of rainfall, it is easy to induce the creep deformation of the slope and even the overall slide [3][4][5]. Moreover, after the slope instability, the tunnel will have cracks, deformation, and even vault collapses [6,7], which will seri-ously affect the construction safety and the progress of engineering.…”

Section: Introductionmentioning

confidence: 99%

The Progressive Failure Mechanism of the Tunnel-Slope System under Rainfall: An Experimental Investigation

2022

View full text Add to dashboard Cite

Tunnel excavation has always been an important reason for the stability failure of the tunnel-slope system at the portal section. In case of rainfall, it is likely to cause serious disasters such as tunnel vault collapse, water inrush from the tunnel face, and slope slip. In this study, the Sunjiaya tunnel of the Daping slope group was taken as the engineering background, and the tunnel model experiment system under the condition of rainfall and groundwater seepage was designed independently to explore the failure laws of slope instability induced by tunnel excavation under the condition of rainfall. Meanwhile, a fiber grating monitoring system was also used to measure the displacement, water content, earth pressure, and seepage pressure at different positions of the tunnel-slope system in the process of tunnel excavation under the condition of rainfall. The results show that the slope instability caused by rainfall infiltration is gradual. At the beginning of rainfall, the rainfall infiltration has little effect on the stability of the tunnel-slope system and then gradually increases with the continuous rainfall. Finally, the slope surface is uneven, and the phenomenon of gully and surface flow is serious. The foot of slope moves back continuously, resulting in overall collapse. Moreover, during the process of tunnel excavation, the cracks on the tunnel vault of the unburied tunnel lining develop in quadratic along the tunnel excavation direction, and the closer to the excavation section, the larger the collapse range. Finally, there is an integral collapse of the vault of tunnel excavation section. In addition, variation laws of parameters in the tunnel-slope system also provide an important explanation for the hysteresis of the stability failure of the tunnel-slope system. The results have important guiding significance for the stability of the tunnel-slope system during construction.

show abstract

Section: Introductionmentioning

confidence: 99%

The Progressive Failure Mechanism of the Tunnel-Slope System under Rainfall: An Experimental Investigation

2022

View full text Add to dashboard Cite

show abstract

“…Based on the concept of representative elementary volume (REV) and synthetic rock mass (SRM) modeling technology, Wang and Cai [4] proposed a discrete fracture network-discrete element method (DFN-DEM) multiscale modeling approach for determining the response of jointed rock masses to excavation. Roy et al [5] used the Voronoi subdivision scheme in a framework based on discrete elements to simulate massive rock masses. The prediction model of the convergent strain of a tunnel is constructed by considering the uncertainty in the joint parameters and field stress ratio.…”

Section: Introductionmentioning

confidence: 99%

Research on the Deformation Law of Jointed Surrounding Rock during Tunnel Excavation Based on Hydromechanical Coupling

Wang

2021

Geofluids

View full text Add to dashboard Cite

The coupling of the joint network and groundwater in rock under bias conditions has a significant impact on the deformation and failure of the surrounding rock due to tunnel excavation. This paper studies the deformation and failure of surrounding rock after tunnel excavation under different joint network and groundwater conditions. A finite element-based composite joint network modeling method is proposed in this paper, and the typical parameters of the surrounding rock, such as the plastic zone size, vertical displacement, and lateral displacement, are analyzed and compared through numerical calculations. According to the different stratum and hydraulic conditions considered, four numerical models under four different working conditions are established and studied. The deformation and failure laws of the surrounding rock during tunnel excavation are obtained. The results show that with a single joint network, when there is no influence of groundwater, the surrounding rock mainly undergoes shear failure at the arch crown after tunnel excavation. When the influence of groundwater is considered, there are differences in the mode of damage between the left and right sides of the tunnel. The stratum approximately 1 m from the invert breaks, and the right sidewall fails approximately 1 m from the measuring point. In rock with a composite joint network, when groundwater is not considered, two kinds of failures occur in the surrounding rock near the tunnel; however, the surrounding rock far from the tunnel is dominated by shear failure. The stratum approximately 3.5 m from the arch crown fractures and the surrounding rock within approximately 5.5 m from the measurement point on the right sidewall undergoes separation failure. Under the dual effects of joints and groundwater, soft rock deforms considerably. The total hydraulic gradient decreases from left to right before and after tunnel excavation. The total hydraulic gradient of the composite joint network strata is generally smaller than that of the single joint network. In the composite joint network strata, the total hydraulic gradient near the tunnel changes dramatically. This research can provide a reference for tunnel engineering under similar conditions.

show abstract

A Novel Mixed-Mode Power Exponent Cohesive Zone Model for FDEM and Its Application to Tunnel Excavation in the Layered Rock Mass

Liu,

Deng

et al. 2023

Rock Mech Rock Eng

View full text Add to dashboard Cite

Prediction Model for Performance Evaluation of Tunnel Excavation in Blocky Rock Mass

Cited by 10 publications

References 45 publications

The Progressive Failure Mechanism of the Tunnel-Slope System under Rainfall: An Experimental Investigation

The Progressive Failure Mechanism of the Tunnel-Slope System under Rainfall: An Experimental Investigation

Research on the Deformation Law of Jointed Surrounding Rock during Tunnel Excavation Based on Hydromechanical Coupling

A Novel Mixed-Mode Power Exponent Cohesive Zone Model for FDEM and Its Application to Tunnel Excavation in the Layered Rock Mass

Contact Info

Product

Resources

About