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Composite stratum shield tunneling efficiency on-site prediction and calculation method

A technology of composite strata and calculation methods, which is applied in earth-moving drilling, mining equipment, mining equipment, etc., can solve the problems of high data quality requirements, unfavorable, difficult on-site measurement of geological index parameters, etc., achieving significant economic benefits and saving construction costs. Effect

Active Publication Date: 2020-11-17
NANJING UNIV OF TECH +1
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Problems solved by technology

However, this method requires high data quality, and it is difficult to measure all geological parameters on site in time, which is not conducive to the rapid decision-making of on-site construction managers to increase the excavation rate.

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  • Composite stratum shield tunneling efficiency on-site prediction and calculation method
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  • Composite stratum shield tunneling efficiency on-site prediction and calculation method

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Embodiment Construction

[0050] In order to overcome the defects of the above-mentioned prior art, the present invention proposes a method for on-site prediction and calculation of shield tunneling efficiency in composite strata, which specifically includes the following steps:

[0051] Step 1. Obtain the index RD of the rock fragmentation degree of the drilled core

[0052] Define the index RD of the rock fragmentation degree of the drilling core, the larger the RD, the more fragmented the core, as shown in formula (1).

[0053]

[0054] Among them, RD is the index of rock fragmentation degree, L is the total length of drilling cores, i is the number of core segments in the same stratum from shallow to deep according to the sampling depth, and n is the total number of all core segments, d i is the length of the core section numbered i in the same formation.

[0055] The index RD can more accurately distinguish the degree of rock fragmentation, and the use of the RD index can better reflect the d...

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Abstract

The invention discloses a composite stratum shield tunneling efficiency on-site prediction and calculation method. The method mainly comprises the steps that a rock crushing degree index of a drilledrock core is measured and calculated; the BQ value of each stratum is calculated according to engineering investigation data, and the rock slag point load intensity is obtained according to rock slagsof a construction site; and an empirical relationship formula between the crushing degree index and the point load intensity is obtained; and based on the result and the area ratio of each stratum ofa tunnel face, a composite stratum full-section on-site rock mass tunneling difficulty index RH<f> can be obtained, and finally a composite stratum shield tunneling efficiency prediction model established based on the total shield thrust F and the RH<f> is obtained according to the tunneling efficiency, the total thrust, the cutterhead torque and the tunneling rate. The method can be directly applied to the shield construction site, indexes and calculation parameters have the advantages of measurement-and-use, convenience and high efficiency, the construction period cost is saved, the economic benefit is remarkable, the index calculation evaluation result conforms to the actual law, and the method has important engineering significance for guiding and perfecting intelligent construction of a roadheader.

Description

technical field [0001] The invention belongs to the field of intelligent calculation and application method of driving parameters of a full-face tunnel boring machine, and in particular relates to a method for on-site prediction and calculation of shield tunneling efficiency in composite strata. Background technique [0002] At present, the quantitative prediction of tunneling efficiency of shield tunneling in composite strata is recognized as a major engineering problem. In particular, it is best to measure and use immediately, and there are very few accurate prediction methods for tunneling efficiency that can be directly used to guide shield construction. The calculation process of the proposed method is complicated, the accuracy is not high, and it cannot be applied in time to guide on-site construction. In view of the above defects, a method for on-site prediction and calculation of shield tunneling efficiency in composite strata proposed by the present invention is base...

Claims

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Application Information

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IPC IPC(8): E21F17/00E21D9/08E21D9/093
CPCE21F17/00E21D9/08E21D9/093
Inventor 李闯韩爱民施烨辉李彤程荷兰李璇
Owner NANJING UNIV OF TECH
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