Real-time detection method for soft and hard combined stratum distribution area of shield excavation face based on hob rock breaking response

Abstract

The invention discloses a real-time detection method for a soft and hard combined stratum distribution area of a shield excavation surface based on hob rock breaking response.Response change characteristics of a selected hob conducting rock breaking along a circular track in the rotating process of a cutterhead is measured by using different types of sensors; according to the rolling rock breakingcharacteristics of the hob on rock bodies with different lithologies, dividing points of the rock bodies with different hardnesses are determined on the circular track; the soft and hard combined stratum distribution area on the excavation face can be determined by connecting the dividing points on the rock breaking tracks of different hobs, and therefore the composite ratio of the excavation face can be further obtained. For any hob, one complete circular track can be formed by rotating the corresponding cutterhead for one circle, and the soft and hard combined stratum distribution area of the shield excavation face can be determined only by rotating the cutterhead for one circle in the normal tunneling process of a shield, the sensors can measure the rock breaking response of the hob inreal time, so that the method can realize sensing of the soft and hard combined stratum distribution area of the shield excavation surface in real time.

Description

technical field [0001] The invention relates to the technical field of shield tunneling construction, in particular to a method for real-time detection of the distribution area of ​​soft-hard combination strata on a shield excavation surface based on the rock-breaking response of a hob. Background technique [0002] The shield method has many advantages such as safety, high efficiency, and high degree of mechanization, and has become one of the preferred methods for tunnel construction. The process of shield tunneling involves complex rock-machine action, and the complex geological conditions greatly limit the improvement of shield construction efficiency. The combination of soft and hard strata often causes phenomena such as eccentric loading of the cutterhead, vibration shock, and irregular stress distribution, resulting in accidents such as reduced strength of the cutterhead cutter, local damage and cracking, and abnormal wear of the cutter, which seriously affects the sa...

AI Technical Summary

Problems solved by technology

The process of shield tunneling involves complex rock-machine action, and the complex geological conditions greatly limit the improvement of shield construction efficiency

The combination of soft and hard strata often causes phenomena such as eccentric loading of the cutterhead, vibration shock, and irregular stress distribution, resulting in accidents such as reduced strength of the cutterhead cutter, local damage and cracking, and abnormal wear of the cutter, which seriously affects the safe, reliable and efficient construction of the shield.

It is difficult to achieve the transparency of the information on the formations traversed by shield tunneling in different stages of engineering survey. It is difficult to grasp the distribution of complex formations on the excavation surface in time by conventional methods. The commonly used advanced forecasting devices are still not widely used due to serious signal interference and immature technology.

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