Experimental Investigation of Flow Control Technology for Grouting and Blocking of Flowing Water in Karst Conduits

Pan, Dongdong; Bu, Zehua; Li, Haiyan; Xu, Zhenhao; Liu, Jie

doi:10.1007/s12205-022-2129-3

Cited by 10 publications

(2 citation statements)

References 42 publications

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“…Secondly, there is a bias in the understanding of the failure mode of a grouting pad. The author has observed in the field that the failure mode of a grouting pad was a punching shear failure, guided by cracking along the peripheral grouting holes, rather than a punching shear failure with overall cracking at the bottom [22]. Thirdly, the treatment of the load on a grouting pad deviates from the actual situation in the field.…”

Section: Introductionmentioning

confidence: 99%

Bearing Capacity of a Concrete Grouting Pad on the Working Surface of a Highway Tunnel Shaft

Fang,

Zhao,

Chen

et al. 2024

Applied Sciences

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A grouting pad is the key structure for the construction of water inrush grouting on the shaft working surface. Previous methods of calculating the bearing capacity have limitations due to a lack of understanding of the failure mode. To investigate the bearing capacity of a concrete grouting pad on the working surface of a shaft, this paper establishes a mechanical model for the punching shear failure of a grouting pad under symmetrical loading conditions. A unified solution for the bearing capacity is derived, and the influence of parameters is discussed. In addition, a new method for designing the plastic limit thickness is proposed based on this research. The results show that the reason for the grouting pads’ punching shear failure resulted from the formation of peripheral grouting holes “weak ring” caused by the reduction of the bearing capacity. When the thickness of B0 remains constant, the bearing capacity qu of the grouting pad is inversely proportional to the ratio of the diameter and the area of the bottom load. Therefore, following the method of “dividing, interval, and jumping holes” during grouting construction is recommended. The greater the thickness of the grouting pad, the greater the bearing capacity qu will be. When the grouting pad diameter is 2r2 and the thickness B0 is constant, the bearing capacity qu increases with the material tensile strength ft. When designing grouting pads, following the principles of “large thickness, uniform strength theory, high strength materials” will improve bearing performance. The findings have been implemented in the design of the grouting pad thickness for the Tianshan Shengli Tunnel shaft project, which can successfully solve the problem of frequent cracking caused by the weak bearing capacity of a grouting pad. The findings can provide a theoretical basis and reference for the design and construction of grouting pads in a highway tunnel shaft.

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Section: Introductionmentioning

confidence: 99%

Bearing Capacity of a Concrete Grouting Pad on the Working Surface of a Highway Tunnel Shaft

Fang,

Zhao,

Chen

et al. 2024

Applied Sciences

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“…Model experiments and data statistics of engineering are the main means to study the fracture grouting process 11, 12. Sui et al.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

Pan

Zhang

et al. 2023

Num Anal Meth Geomechanics

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In order to investigate the slurry flow behavior, our newly proposed numerical method is applied to simulate the fracture grouting with flowing water condition. First, by numerical validation and experiment comparison, the advantages of this method in computation efficiency and accuracy are shown. Second, the initial velocity of water and slurry properties at different levels are selected as the influencing factors, the water reduction effect, grouting pressure, and slurry deposition behavior in different cases are investigated, and the variation characteristics of flow field and slurry outflow are analyzed. The simulation results show that within the range of slurry properties and flow velocity given in this paper, cement slurry cannot seal the water inflow. Instead, quick setting slurry with different material ratios can effectively seal the fracture. The sealing efficiency is more sensitive to the initial flow rate than the slurry property. When the groundwater flow rate is low, the effect of slurry proportion on sealing can be ignored. Meanwhile, slurry properties have more influence on the final grouting pressure. There is an obvious surge in grouting pressure after sealing, which can be used as a criterion for fracture sealing.

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A Novel Grouting Simulation Method Considering Diffusion and Loss of Slurry in Flowing Water: Interphase Miscible-Transport Time-Tracking (IM-3T) Method

Zhang

Pan

et al. 2023

Rock Mech Rock Eng

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Experimental Investigation of Flow Control Technology for Grouting and Blocking of Flowing Water in Karst Conduits

Cited by 10 publications

References 42 publications

Bearing Capacity of a Concrete Grouting Pad on the Working Surface of a Highway Tunnel Shaft

Bearing Capacity of a Concrete Grouting Pad on the Working Surface of a Highway Tunnel Shaft

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

A Novel Grouting Simulation Method Considering Diffusion and Loss of Slurry in Flowing Water: Interphase Miscible-Transport Time-Tracking (IM-3T) Method

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