Device and method for advanced detection of adverse geological and mechanical properties of rock mass in deep and long tunnels

Abstract

The invention discloses an advanced detection device and method for unfavorable geology and rock mass mechanical properties of deep and long tunnels. The device comprises a drilling machine, a sensing system, a data conversion system and a data analysis system. The sensing system is installed on the drilling machine; the sensing system, the data conversion system and the data analysis system are connected successively; and the sensing system comprises a drill bit displacement acquisition unit, a rotation speed acquisition unit and a pressure acquisition unit. According to the advanced detection device and method, boreholes and borehole radars are combined, and a sensor technology is used for acquiring parameters of rotation speeds, drill bit displacement, torque, propulsion, impact energy, pumping pressure and the like in real time, and accordingly, rock mass physical and mechanical parameters and joint fissure distribution and occurrences in the geologic body within 30 meters ahead are forecast accurately, whether water body situations exist in a 10m range around a borehole is detected accurately, the cost is low, and the occupied construction time is short.

Description

Technical field [0001] The invention relates to the technical field of advanced geological prediction, in particular to a device and method for advanced detection of poor geological and rock mechanical properties of a deep and long tunnel. Background technique [0002] Tunnel engineering is a kind of geological engineering, and the engineering geological survey before tunnel design and construction. Although the geological condition of the tunnel is predicted and forecasted to a certain extent, due to the complexity of the rock mass, the survey data and the results after the tunnel excavation The actual situation may be quite different. There are a large number of tunnel projects in the fields of water conservancy, hydropower and transportation in China. Geological disasters are the key factor restricting the construction of tunnels. Often due to the unclear geological conditions in front of the tunnel and the inability of survey data to fully accurately reflect the geological co...

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Problems solved by technology

[0003] 1. The indoor test period is long and expensive, and the mechanical parameters of the rock mass measured in the laboratory environment may differ from the actual field values, because the laboratory is separated from the original environmental field, and there are no constraints such as stress and temperature, so , it is difficult to obtain the physical and mechanical parameters under undisturbed

[0004] 2. The previous advanced geological prediction methods, such as TSP (abbreviation for tunnelseismic prediction) and geological radar, etc. cannot obtain the water body within 30 range in front of the tunnel, and the drilling often has the limitation of "one-hole view" or "three-hole view". That is to say, one borehole cannot drill the water body in the geological area in front, and sometimes three boreholes cannot drill the water body in front of the drill face, so it is impossible to fully and accurately obtain the existence of the water body in front of the tunnel face

[0005] 3. The mechanical parameters of conventional tunnel rock mass are obtained by drilling cores in advance, and then measured in the laboratory. Part of the rock core cannot represent the geological conditions of the entire tunnel. The real-time drilling monitoring of the tunnel can obtain the rock mass mechanical parameters and lithological changes in various parts of the tunnel.

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