A Method for Stability Evaluation of Interbedded Rock Partition Wall in Highway Tunnel

Abstract

The invention relates to a highway tunnel middle sandwich rock partition wall stability evaluating method. According to the method, sensors distributed at two sides of a tunnel middle sandwich rock partition wall in a matrix form are used for performing micro-seismic monitoring; seismic wave information of a rock breaking seismic source and an auxiliary seismic source is separated out from the micro-seismic monitoring result; the crack position is primarily positioned according to the micro-seismic wave information on the basis of the position of micro-seismic waves generated in the rock breaking seismic source; the crack position is further and precisely positioned according to a wave velocity model after the optimization of seismic wave information of the auxiliary seismic source by a double-difference imaging positioning method; a micro-seismic event group generated by the crack in the set space at the set time is selected for performing clustering analysis to obtain the spatial and temporal distribution characteristics and the destructive evolution characteristics of the micro-seismic event; the quantitative description on the rock body rupture degree is performed on the basis of the characteristics; the evolution process of the rock body rupture degree is deduced; further, the stability of the middle sandwich rock partition wall is evaluated. The method has the advantages that the stability of the middle sandwich rock partition wall can be fast evaluated; the tunnel construction safety and the later-period normal operation are ensured.

Description

technical field [0001] The invention relates to the technical field of civil engineering construction, in particular to a method for evaluating the stability of interbedded rock partition walls in highway tunnels. Background technique [0002] With the rapid development of expressways in mountainous areas of our country, tunnels have become an important element of expressways. Small clear distance tunnel is a common type of tunnel, but there are certain safety risks during construction, due to factors such as construction sequence, stress distribution and internal structure, the displacement, deformation and cracking of interlayer rock partition walls. For the interlayer rock partition wall of the highway tunnel with small clear distance, it bears changing loads during the construction of the tunnel, and in the later operation of the tunnel, some damage and deterioration will occur inside the interlayer rock partition wall as time goes by. Therefore, monitoring the interlay...

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Problems solved by technology

[0003] The traditional rock partition wall monitoring methods in the tunnel, such as borehole TV detection and ultrasonic damage detection in the tunnel, the built-in sensor arrangement, based on the information obtained by these sensors when evaluating the structure of the rock partition wall , will inevitably affect the integrity of the interlayer rock partition wall structure to a certain extent

[0004] Moreover, the traditional evaluation method of the interlayer rock partition is mainly formulated for the bias and deformation of the interlayer rock partition, and it is difficult to quantitatively and accurately describe the stress state of the interlayer rock partition under uneven compression

[0005] In addition, traditional monitoring and evaluation methods require a large amount of historical experience data and monitoring data for long-term analysis, and the theoretical model for analysis is insufficient, which cannot meet the needs of rapid evaluation of the stability of interlayer rock partition walls

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