Numerical Simulation of Small Unconnected Karst Caves Grouting and Crack Quantity Impact Based on Fluent Software
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 7
Abstract
Objective Grouting treatment of karst caves is a challenge in metro tunnel engineering, as improper handling of karst caves during construction can easily lead to accidents. Therefore, it is necessary to study the relationship between the quantity of cracks and grouting pressure in small karst caves. Method To address the uncertainty regarding the quantity of cracks in urban small unconnected karst caves (with a volume not exceeding 8 m3) that requires grouting filling, numerical simulations of cave grouting with different crack quantities are conducted using multiphase flow Mixture model in Fluent numerical simulation software. The variation of grouting pressure in the test area during simulated grouting is calculated over time and compared with karst caves grouting pressure data from practical engineering. Result & Conclusion For small unconnected karst caves with a volume not exceeding 8 m3, the grouting pressure in the simulated test area shows an inverse square relationship with the quantity of cracks, and decreasing as the crack quantity increases. When the crack area reaches 0.048 m2, the grouting pressure no longer decreases. The grouting pressure decreases with the increase in the elevation of crack locations. In practical engineering, comparing grouting pressure data among the same type of small unconnected karst caves with volumes not exceeding 8 m3 can serve as a basis for judging the relative quantity of cracks in karst caves, thereby adjusting and optimizing subsequent grouting schemes.
Authors and Affiliations
Ximing YU, Junsheng CHEN, Xingyu LIU, Shuzhuo LIU
Keywords
Related Articles
- EP ID EP742632
- DOI 10.16037/j.1007-869x.2024.07.048
- Views 57
- Downloads 0
Fault Diagnosis Method for Control Circuit of ZDJ9 Double-machine Traction Speed-up Turnout Electric Switch Machine
［Objective］ In the ZDJ9 double-machine traction speed-up turnout electric switch control circuit, 1DQJ is an instantaneous suction relay. When the outdoor switch circuit does not form a loop, that is, in the event of a...
Real-Time Passenger Flow Monitoring System for Urban Rail Transit Based on Cloud Platform Architecture
［Objective］ In view of the shortcomings that the existing urban rail transit system unable meeting the requirements for passenger flow data real-time transmission, solutions for real-time passenger flow data transmissi...
Empirical Analysis on Concentration Degree of Inbound and Outbound Passenger Volume of Guangzhou Urban Rail Transit
Objective Problems in some urban rail transit lines, such as unreasonable directions, station distribution, and transfer station layouts lead to the phenomenon of some high passenger flow stations and extremely low passe...
Impact of Small Clearance Bored Pile Construction under Rail Transit Bridges in Soft Soil Area
Objective The impact of small clearance construction between bored piles and piers of operational rail transit bridges in China′s coastal soft soil areas is becoming a bottleneck factor restricting urban rail transit pla...
Manufacturing Process of Straddle Monorail Beam-switching Turnout
[Objective] Due to the diverse components, complex internal structures, and significant deformation risks of straddle monorail beam-switching turnout, issues such as improper component installation, welding-induced therm...