The value method of dynamic design safety factor of large open-pit mine slope during service period

Abstract

A method for calculating the dynamic design safety factor of large-scale open-pit mine slopes during the service period. According to the slope engineering geological survey results, the stability state of the slope is compared with the slope determined based on the graded analysis of slope stability and the fine value selection of rock mass structural planes. The difference of stability coefficient, determine the systematic error of slope stability coefficient δ s ;According to the solution, the slope stability coefficient k obtained by the traditional method i , to calculate the slope stability coefficient k 0 and the systematic error δ of the slope stability coefficient s , to calculate the static error δ of slope stability evaluation 1 ; The service period of large open-pit mines is different, and the calculation of slope stability based on the calculation parameters obtained during the evaluation period will produce different errors δ with the different mine service periods 2 , the long-term dynamic error δ 2 Via recent static error δ 1 Determined; take 66% and 95% as the confidence level, respectively get the dynamic design safety factor of the slope service period. The invention can effectively and quantitatively determine the dynamic design safety factor of the large-scale open-pit mine slope during the service period.

Description

technical field [0001] The present invention relates to a large-scale open-pit mine slope service period dynamic design safety coefficient value method, in particular, the present invention is based on the analysis of the stability coefficient accuracy and stability coefficient error, based on the slope stability change state during the service period, for A deterministic solution is provided to the dynamic design safety coefficient value problem of large open-pit mine slope during service period, which significantly improves the reliability of large open-pit mine slope design safety factor value. The invention belongs to the field of engineering technology. Background technique [0002] Slope stability analysis is an important decision-making basis to determine whether the slope is in a stable state, whether it needs to be reinforced and treated, and to prevent it from being damaged. The slope stability coefficient analysis method is the basic method to evaluate the slope s...

AI Technical Summary

Problems solved by technology

Although the value of this safety factor has been written into the specification, they are proposed on the basis of summarizing experience and have played a certain role in solving practical engineering problems. However, human factors have a great influence on the value of specific projects. , and for different engineering geological conditions and different degrees of understanding of engineering geological conditions, there is no good distinction, and it is difficult for decision makers to feel "sure".

When the accuracy of slope stability evaluation results is difficult to accurately estimate, the safety and reliability are often guaranteed by artificially increasing the design safety factor and increasing engineering investment. waste is amazing

Starting from the economics of open-pit mining, improperly increasing the design safety factor will obviously increase the funds for mineral development, reduce the profits of mining companies, and bring greater resource losses to the country. The purpose of the level of comprehensive utilization runs counter to the goal, but blindly pursuing economy and reducing the design safety factor may lead to slope instability and damage, resulting in greater economic losses and casualties, and the result is counterproductive.

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