A method and system for in-situ monitoring and analysis of soft rock creep

Abstract

The invention discloses a method and system for in-situ monitoring and analysis of soft rock creep. The method includes: acquiring the instantaneous data and creep data of deformation, strain and stress of each measuring point on the formation at different depths under different pore pressure and temperature conditions. According to the instantaneous data of pressure obtained from on-site monitoring, the instantaneous deformation, strain and stress of any point on the formation at each depth can be calculated; according to the creep data of deformation or strain of each measuring point obtained from on-site monitoring, the corresponding The creep characteristic parameters of the rock at the measurement point in the in-situ state; according to the data obtained from on-site monitoring and calculation, the creep parameters of the formation in the measurement section and their variation with depth, as well as the overall soft rock roadway surrounding rock over time amount of deformation. Therefore, by adopting the scheme provided by the present invention, it is possible to timely and effectively study the overall deformation characteristics and laws during the support process of the tunnel boring machine in soft rock, realize the targeted design of roadway support parameters, and effectively grasp the best support timing.

Description

technical field [0001] The invention relates to the field of tunnel engineering technology and mine safety mining technology, in particular to an in-situ monitoring and analysis method and system for soft rock creep. Background technique [0002] At present, most of the creep parameter tests for formations are carried out by indoor experiments. Most of the samples used in the experiment are processed cores retrieved from the site. Since the core is not subjected to pressure preservation and heat preservation measures during collection and transportation, pressure relief and cooling will occur. The pressure relief and cooling of the core has little effect on the test results of the shallow formation, but for the deep formation, because the properties of the core during the experiment and the actual formation are quite different, it has a greater impact on the test results. [0003] In order to reduce the difference in test results caused by the difference between the retrie...

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Problems solved by technology

However, this method has the following problems: on the one hand, the excavation space is large, the time is long, the unloading effect is obvious, and the actual ground stress cannot be provided; Soft rock has a large amount of deformation and a long period of time effect, so this type of method cannot achieve real-time monitoring of the whole process, and the deformation laws of different positions of the roadway are different, so it is difficult to grasp the creep deformation law of the full-section soft rock roadway, and it is impossible to analyze Reasonable guidance on site support methods and support parameters will affect the long-term stable use of tunnels (roadways)

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