3 results about "Tunnel engineering" patented technology

The invention belongs to the technical field of tunnel engineering, and discloses a dynamic risk acquisition method for tunnel large deformation disasters, which comprises the following steps: S1, identifying risk disaster-causing factors according to historical data of the tunnel large deformation disasters; S2, selecting a prediction index according to the risk disaster-causing factor, and establishing a probability prediction model according to the prediction index; S3, dynamically updating surrounding rock parameters by using a Bayesian method and a Markov random process method according to the prediction index and the exposed surrounding rock information of tunnel face excavation; S4, according to the surrounding rock parameters, the prediction indexes and the probability prediction model, carrying out posterior risk updating and acquiring a dynamic risk prediction result of the tunnel large deformation disaster. The method solves the problems that in the prior art, a set of quantitative risk evaluation model capable of reflecting a large deformation action mechanism cannot be established, effective feedback of surrounding rock and support information in the construction period cannot be effectively utilized, and a dynamic and informationized risk evaluation theory cannot be formed.

The invention discloses a bored tunnel mechanized construction method in combination with a drilling injection method, and belongs to the technical field of tunnel engineering.Advanced reinforcement is carried out on a tunnel face with the drilling injection method, and then mechanized construction of a subway tunnel is carried out in combination with subway soft soil excavation equipment.The specific construction method includes the following steps that firstly, a left drilling part and a right drilling part are constructed at the same time, and advanced small pipes are driven into the tunnel face; 2, mechanized soil excavation is achieved through an excavation main arm, and real-time collection is carried out through a spading plate; 3, grids are erected and lifted through the excavation main arm, the top grid is fixed, and then the grids on the two sides are positioned and connected; fourthly, the operation of grid connecting bolt fastening, connecting steel bar welding, mesh sheet combining, guniting, construction, correction and the like is carried out through a manual operation platform carried on the subway soft soil excavation equipment.By means of the construction method, the construction efficiency of the bored tunnel section in subway construction can be improved, labor input can be reduced, and the construction period can be shortened.

The invention discloses a diamond drill bit for comprehensive drilling, and belongs to the technical equipment fields of petroleum and natural gas drilling engineering, mine engineering, geological drilling, geothermal drilling, hydrological drilling, tunnel engineering, shielding, non-excavation and the like. The drill bit comprises a drill bit body, a water hole formed in the bit body, and a plurality of cutter wings extending from the drill bit body or fixed to the drill bit body, and fixed cutting elements are arranged on the cutter wings. The drill bit is characterized in that the drill bit further comprises at least one nozzle, and the nozzle comprises a flow mixing body; a flow mixing cavity, an exit port, a central hole communicating with the flow mixing cavity and at least one cut-in groove communicating with the flow mixing cavity are formed in the flow mixing body; and the central hole is used for forming a liquid straight flow in the flow mixing cavity, the cut-in groove isused for forming a liquid swirling flow in the flow mixing cavity, and the exit port is used for forming a channel for liquid ejection in the flow mixing cavity. The invention aims to provide the diamond drill bit suitable for comprehensive drilling, and the problems that in the rock breaking process of an existing drill bit, the working life of the drill bit is shortened and the drilling capacity is reduced due to the unreasonable hydraulic structure are effectively solved.