Earth pressure balance shield muck improvement effect evaluation method based on tunneling energy

Abstract

The invention discloses an earth pressure balance shield muck improvement effect evaluation method based on tunneling energy, and the method is characterized in that the method comprises the followingsteps: (1) calculating the initial tunneling specific energy of a representative stratum; (2) carrying out a representative stratum muck improvement tunneling test; (3) drawing a relation curve of modifier gradient and tunneling specific energy; (4) drawing a relation curve of penetration and tunneling specific energy; and (5) evaluating the improvement effect of the improver and selecting indexes. According to the method, through a representative stratum muck improvement tunneling test for controlling the modifier proportion or dosage gradient, the change relationship between the modifier gradient and the tunneling specific energy is established by utilizing the construction parameters of the earth pressure balance shield in the stratum to serve as an energy method for optimizing and evaluating muck improvement; and the optimal value of the modifier for on-site muck improvement can be selected according to the relationship curve form, so that the scientificity problem of an indoor test is solved, the limitation of a single shield construction parameter evaluation index is overcome, and the method can be applied to shield construction muck improvement effect evaluation and optimization of different soil stratums.

Description

technical field [0001] The invention relates to the field of earth pressure balance shield construction, in particular to a method for evaluating the improvement effect of earth pressure balance shield dregs based on excavation energy. Background technique [0002] Due to its superior and reliable working performance, earth pressure balance shield has been continuously valued and used in my country's booming underground space engineering construction activities in recent years, and the construction technology level of earth pressure balance shield has been continuously innovated and improved. However, under complex strata, the excavation performance of earth pressure balance is often low, and the control objectives of construction period and investment cost cannot be achieved. Targeted muck improvement for complex strata is an important technical means to increase the construction speed of earth pressure balance shield machine. Slag modifiers such as foaming agents, bentonit...

AI Technical Summary

Problems solved by technology

Although it is possible to carry out experimental research and evaluation on the improvement effect of muck indoors in advance, the scientific nature of being separated from the actual construction environment has yet to be resolved; others are based on a single construction parameter index (such as the thrust of the shield machine, the torque of the cutterhead, etc.) The limitations of the muck improvement evaluation method are also unavoidable. For example, in the construction of the shield, the extrusion, crushing and mixing of the soil layer are mainly done by the cutter head, and the thrust of the shield machine is relatively small. Therefore, according to It is difficult to objectively evaluate the improvement effect of muck soil due to the decrease of thrust

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