Method for monitoring and determining position of internal fracture surface of rock and soil body based on multi-point displacement meter

Abstract

The invention relates to a method for monitoring and determining the position of an internal fracture surface of a rock and soil body based on a multi-point displacement meter. The method comprises through the analysis of the data of multiple horizontal multi-displacement meters, screening out two adjacent measurement points with a maximum cumulative absolute displacement per unit length between two measurement points of each displacement meter, and preliminarily determining that the fracture surface is between the adjacent measurement points; by using the fracture surface of an area where three displacement meters are located as a reference plane and by supposing that a reference fracture surface is planar and the displacement variation values at both ends are the same, establishing an equation that includes the coordinates of the intersection point between the fracture surface and the displacement meter, solving the coordinates of the intersection point; by using the coordinates ofthe two ends of the reference fracture surface as a reference, successively positioning the intersection points of the rest fracture surfaces and the displacement meters; solving the coordinates of the intersection points of all the displacement meters and the fracture surface; and obtaining the specific location of the entire fracture surface by connecting the intersection points. The method canquickly determine the specific location of the fracture surface, and has great significance in the stability evaluation and reinforcement design of slopes.

Description

technical field [0001] The invention relates to a method suitable for determining the position of an internal fracture surface of a rock and soil mass, in particular to a method for determining the position of the internal fracture surface of a rock and soil mass based on multi-point displacement meter monitoring. Background technique [0002] As a commonly used deformation monitoring instrument, multi-point displacement meter has been widely used in geotechnical engineering monitoring. In particular, it is widely used in deformation monitoring of slopes, landslides, underground and surrounding rock of tunnel engineering. [0003] There is still no good analysis method for how to accurately determine the location of the fracture surface in engineering rock and soil mass. For landslides and slope projects, most of them are roughly determined by analyzing the monitoring data of the inclinometer. However, most of the surrounding rock of underground caverns and tunnels can onl...

AI Technical Summary

Problems solved by technology

Most of the surrounding rocks in underground caverns and tunnels can only roughly determine the loosening and cracking conditions or partitions of the surrounding rocks through wave velocity tests, and it is impossible to specifically determine the location of the cracking surface.

[0004] The multi-point displacement meter is mainly used to monitor the deformation inside the rock and soil mass. In the previous research, only the monitoring results of the multi-point displacement meter can be used to analyze the general range of the fracture surface, that is, the fracture surface may be located at two measuring points. The position, shape and extension direction of the rupture surface cannot be accurately determined

Therefore, there is still no method to accurately determine the position of rock and soil mass through the monitoring of multi-point displacement meters. Further positioning must be combined with further exploration, which greatly prolongs the time required for project construction and stability evaluation. and increased economic input

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