Method for monitoring stability and predicting destabilization of side slope based on change of state of strain of soil-rock mass

Abstract

The invention discloses a method for monitoring the stability and predicting the destabilization of a side slope based on the change of the state of strain of soil-rock mass, which is used for monitoring strain sensitivity and strain acceleration condition along a sensor distribution direction in the side slope to fulfill the aims of pre-warning and prediction under the condition that buried monitoring sensors do not change the stable state of the side slope by arranging a plurality of parallel or slightly inclined multi-point strain gauges or distributed strain gauges in a slope body of the side slope, judging the plastic zone and potential destabilization range of the side slope according to the strain sensitivity change of the multi-point strain gauges or the distributed strain gauges and evaluating the stability of the side slope. Specifically for the slope bodies which are not obviously deformed before the side slopes are destabilized, a conventional displacement monitoring method cannot monitor and pre-warn the destabilization. Compared with the conventional method, the method has inimitable advantages, and compared with the conventional method for monitoring the stability of the side slope and a landslide disaster, is more direct and more rational monitoring means.

Description

technical field [0001] The present invention relates to the research field of engineering geological hazards such as slope stability monitoring and landslide prediction, and in particular to a slope stability monitoring and instability prediction method based on sudden changes in the strain state of rock and soil, which can meet the requirements of slope engineering monitoring and the need for instability prediction. Background technique [0002] There are many factors that affect slope stability. Generally, natural slopes are in a stable state, but the initial stress field distribution is broken due to changes in the surrounding environment and human activities in the later period, thus changing the stable state of the slope. Usually, the generation of landslides will be accompanied by obvious displacement. It is more reasonable to use surface displacement monitoring to judge the stability of slopes and predict landslides during the instability and sliding process of such s...

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Problems solved by technology

[0004] (1) Structure status monitoring: including the monitoring of the stress and displacement status of reinforced structures such as piles and anchors. The monitored structures belong to the structures of the reinforced slope. Slope stability cannot establish a definite link;

[0005] (2) Slope surface displacement: Slope surface displacement monitoring is more effective for slopes with large deformation before the instability. The sliding trend of the slope can be judged according to the change law of the monitored displacement, but for the slope with small deformation before the instability At the same time, the slope displacement monitoring points are easily affected by various external factors (such as falling rocks, etc.), resulting in large monitoring errors or invalid monitoring;

[0006] (3) Displacement in the slope: Generally, multi-point displacement meters are used for monitoring, and the monitoring results are the same as the displacement of the slope surface. It is impossible to effectively monitor the slope body with small deformation before the instability. At the same time, the monitoring results may also be due to external factors. The influence of the large error

[0011] (3) Changes in rock and soil parameters: Various unfavorable factors lead to changes in the physical and mechanical parameters of rock and soil that are not conducive to slope stability;

[0012] (4) Partial or complete failure of the original reinforcement structure: For the artificial slopes that have been reinforced, especially the tall slopes in hydropower and other industries, with the passage of time, the influence of weathering, corrosion and other reasons will lead to the failure of the existing reinforcement structure. partial or total failure

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