Method for determining diameter of high-pressure rotary jet grouting pile based on circular free turbulent jet theory
A technology of high-pressure rotary jetting pile and determining method, which is applied in the test of foundation structure, basic structure engineering, construction, etc., can solve the problems of difficult application, high uncertainty, insufficient soil properties and rotary jetting construction parameters, etc. To achieve the effect of accurate judgment and prediction, simple method, and avoidance of unreliability
Active Publication Date: 2012-03-14
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
Since this method relies purely on the author's construction experience in Japan, the uncertainty is high, and the method is not comprehensive enough in terms of soil and rotary grouting construction parameters, so it is difficult to apply it to the practice of rotary grouting engineering in my country
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[0047] This example illustrates the method of determining the diameter of the high-pressure jet grouting pile by using high-pressure jet jetting technology to strengthen the formation. There are no operations specifically described in this example. Refer to the method already given in the summary of the invention, and will not repeat them here.
[0048] This embodiment is specifically as follows:
[0049] A high-pressure jet grouting reinforced foundation site is located in Shanghai. The groundwater level in this area floats 1-2m below the ground surface. The designed pile length of the high-pressure jet grouting pile is 20m, the pile top is 2m below the ground surface, and the pile bottom is 22m below the ground surface.
[0050] The first step is to clarify the geological conditions of the site: the top layer (0.0-1.6 m) is the backfill soil layer; the lower layer (1.6-15.5 m) is the clayey silt layer; the lower layer (15.5-25.2 m) is the soft clay layer , and the nex...
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Abstract
The invention discloses a method for determining the diameter of a high-pressure rotary jet grouting pile based on a circular free turbulent jet theory. The method comprises the following steps of: determining soil layer parameters through a geological survey method so as to determine a critical damaging speed of a soil layer; determining a flow speed of cement slurry at a nozzle outlet and a decay coefficient of the flow speed of the cement slurry along a spraying distance according to construction parameters; and finally, accurately determining the diameter of the high-pressure rotary jet grouting pile, thereby bringing about convenience for the construction of a high-pressure rotary jet design. Based on the circular free turbulent jet theory, the unreliability of the diameter of the high-pressure rotary jet grouting pile which is determined by pure experience previously is avoided by comprehensively considering the influence of the soil layer parameters and the parameters of high-pressure rotary jet construction on the diameter of the high-pressure rotary jet grouting pile when the high-pressure rotary jet grouting pile is constructed. In the actual application of the method provided by the invention, compared with the traditional method, the method has the advantages that the judgment and the predication on the diameter of the high-pressure rotary jet grouting pile can be more accurate and the method is simpler. The method is applicable to determining the diameter of a high-pressure rotary jet reinforcement body in the high-pressure rotary jet design.
Description
technical field [0001] The invention relates to a method in the technical field of construction engineering, in particular to a method for determining the diameter of a reinforced body generated by high-pressure rotary spraying construction technology. Background technique [0002] With the continuous development of my country's infrastructure construction, high-pressure rotary spraying technology has been widely used in underground engineering, such as the protection piles around the foundation pit, the reinforcement of the entrance and exit holes of the shield machine, etc. High-pressure rotary grouting technology combines the principle of high-pressure water jet technology in hydraulic coal mining with chemical grouting technology. It uses high-pressure cement slurry to spray and impact the soil layer. The slurry and soil particles are mixed with each other and formed after chemical reactions in the formation. A solid cylindrical consolidation (this reinforcement is ge...
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IPC IPC(8): E02D33/00
Inventor 王志丰沈水龙许烨霜
Owner SHANGHAI JIAO TONG UNIV
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