A method for measuring the critical specific gravity of reinforcement mud for large-diameter borehole retaining wall

Abstract

The invention relates to the field of large cast-in-place pile drilled hole collapse and hole wall stability evaluation and control, in particular to a measurement method of the large-aperture drilling dado reinforcing mud critical proportion. The method mainly solves the problems that an existing analysis method is generally limited to the theoretical level and hardly applied to engineering practice or lacks the theoretical basis and is difficult to apply and popularize. The measurement method includes the following specific steps that physical and mechanics parameters of a soil mass of a foundation of drilling and pouring pile engineering are explored and measured; the vertical load generated by the peripheral heaped load of a hole opening on the hole wall is determined; related parameters such as the downward flowing speed vn of mud of a dado in the drill lifting process are determined; the dado mud critical proportion of a certain drilling depth z (m) is determined; the dado mud proportions of the soil layer in different drilling depths are determined; and the drilling construction dado mud critical design proportion is determined. By the adoption of the measurement method, the dado mud proportion can be determined scientifically and effectively, the purpose of controlling hole collapse of the cast-in-place pile hole wall can be achieved scientifically and effectively, construction quality is improved, and construction cost is lowered.

Description

technical field [0001] The invention relates to the field of evaluation and prevention of borehole collapse and hole wall stability of large cast-in-place piles, in particular to a method for measuring the critical specific gravity of mud for reinforcement of large-diameter borehole walls. Background technique [0002] Pile foundation is one of the main foundation reinforcement projects to increase the overall stability of the foundation and improve the bearing capacity of the foundation. With the development of industrial technology and engineering construction, the technology, design method, and bearing capacity of pile foundations have developed rapidly. Pile foundations have greater bearing capacity, stability, and ability to coordinate uneven settlement. It has strong adaptability to the conditions and is the most widely used foundation form in deep foundation engineering. According to the construction method, it can be summarized as soil-squeezed piles and bored piles....

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Problems solved by technology

The mechanical analysis methods in the above methods are often limited to the analysis of the stability of the hole wall at the theoretical level, and no good prevention and control measures have been proposed, so it is difficult to apply to engineering practice; the calculation process of the numerical analysis method is more complicated, and the boundary of the hole wall soil Conditions and constitutive relations are relatively strict, and affected by geological models, simplified mechanical models and mechanical parameters, it is difficult to make accurate evaluations of calculation results, and it is not easy to apply them to engineering practice; and engineering empirical analysis methods lack theoretical basis , the analysis method has no unified and clear regulations, and it cannot be widely promoted and applied in the drilling construction of cast-in-situ pile engineering.

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