An underground engineering initial stress field dynamic inversion method based on multi-source actual measurement information

Abstract

The invention discloses an underground engineering initial stress field dynamic inversion method based on multi-source actual measurement information. The underground engineering initial stress fielddynamic inversion method specifically comprises an underground hard rock engineering initial stress field dynamic inversion method based on the multi-source actual measurement information and an underground soft rock engineering initial stress field dynamic inversion method based on the multi-source actual measurement information. According to the method, for tunnels with different lithology characters, different on-site measured data are adopted as main control indexes to invert the initial stress field, and a stress field inversion result which is more accurate than that of a conventional inversion method can be obtained. The advantages of the method can be well exerted when the calculation area is large and the number of drilled holes for measuring the in-situ crustal stress is small oreven no in-situ crustal stress test exists.

Description

technical field [0001] The invention relates to the technical field of underground engineering, in particular to a method for dynamic inversion of initial stress field of underground engineering based on multi-source measured information. Background technique [0002] At present, tunnels are mainly designed and constructed based on the concept of NATM. In order to carry out safe and efficient construction, it is necessary to carry out necessary monitoring and measurement of the tunnel, such as the displacement information of the section. In large buried deep hard rock tunnels, the secondary stress of the tunnel wall is often taken as the main test item, and there is a large amount of on-site measured information during construction. Large buried depth tunnels are limited by topography, so it is usually impossible to measure the initial in-situ stress field, and the initial stress field is the main controlling factor affecting long and large tunnels. Therefore, how to effect...

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Problems solved by technology

The initial in-situ stress can be obtained more accurately through in-situ in-situ stress field tests, but most of the tests cannot be carried out due to factors such as site and funding, and it is difficult for the test results to reflect the distribution of the initial in-situ stress field in the entire tunnel site area. The initial in-situ stress field obtained by inversion often has certain errors due to factors such as the lack of in-situ in-situ stress data and the large inversion area and the actual situation on the site. Therefore, in order to obtain a more accurate distribution of the initial in-situ stress field, It is necessary to carry out the inversion analysis of the secondary in-situ stress field by using a certain calculation model or mathematical theory based on the relevant information such as displacement and stress in the process of engineering construction, based on the initial in-situ stress field obtained from the first inversion. In addition to the secondary inversion method, when there are fewer boreholes for measuring the in-situ stress and the calculation area is larger, there will be a certain error between the inverted stress field and the actual situation on the spot.

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