Quantitative method utilizing equivalent rock mass basic quality index to predict shield driving parameters

Abstract

The invention relates to a quantitative method utilizing an equivalent rock mass basic quality index to predict shield driving parameters and relates to the geotechnical engineering and tunnel engineering investigation, design and construction technology field. According to the method, the equivalent rock mass basic quality index is taken as basis, geological segmentation of complex strata is carried out, and segmented statistics of the driving parameters is carried out; experience relationships among the driving rate, cutterhead torque and other driving parameters are calculated through gradual regression to acquire a general driving rate prediction model and a general cutterhead torque prediction model which adapt to uniform strata and the complex strata; through quantitative analysis on the corresponding relationships among a general driving rate prediction model coefficient, a general cutterhead torque prediction model coefficient and the equivalent rock mass basic quality index, the driving parameters are acquired through prediction. The method is advantaged in that the method has great theoretical meaning and engineering application values for construction scheme design, construction cost-construction period control and shield-surrounding rock interaction rule analysis.

Description

technical field [0001] The invention relates to a quantitative method for predicting driving parameters by using equivalent basic quality indexes of rock mass, and belongs to the technical field of survey, design and construction of tunnel engineering. Background technique [0002] (1) Shield excavation in compound strata, quantitative prediction of excavation parameters in complex strata is a major engineering problem. In complex strata, homogeneous strata and compound strata are distributed section by section, and the physical and mechanical parameters of the strata along the shield excavation line are different section by section. To find the prediction method of shield tunneling speed and cutter head torque suitable for complex strata Construction has theoretical guiding significance and reference value. [0003] (2) At present, the prediction methods of shield tunneling speed and cutter head torque at home and abroad mainly include theoretical calculation method and em...

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Problems solved by technology

According to the surrounding rock data, the invention uses the efficiency prediction model to predict the excavation efficiency of the next section of excavation; according to the mathematical relationship between the excavation efficiency and the excavation parameters, the excavation parameters of the excavation system are calculated. The main problems are: ①In the formula of the excavation parameters Both contain surrounding rock parameters, and the surrounding rock parameters correspond to the types of surrounding rocks. The tunneling parameters are the parameters of the full-section excavation of the shield machine, reflecting the entire face of the face rather than various strata and shield mechanical equipment in the face. The interaction of these factors makes it difficult to apply relevant conclusions in this patent to composite strata; ② There are too many surrounding rock parameters in the excavation parameters, and the current engineering investigation level is difficult to meet the application requirements of relevant formulas

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