Construction method for extension model of slurry splitting fissure in clay stratum
A construction method, technique of clay layers, applied in the direction of testing the strength of the material using applied steady tension/compression
Active Publication Date: 2019-01-11
BEIJING JIAOTONG UNIV
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[0003] The above situation is generally only studied for the grouting effect, and the penetration of the grout in the soil needs to be considered. However, if the grouting rate and pressure reach a certain level, the grout will be under the action of pressure before it can penetrate into the soil. The soil is split, and the subsequent cracks continue to extend to the free ground surface. There is no detailed research on the splitting and crack extension process in the prior art
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Embodiment 1
[0035] The construction method of the mud-water splitting crack extension model in the clay stratum among the present invention comprises the following steps:
[0036] S1, such as figure 1 Shown, form the uniform clay layer that thickness is 16-22m (preferably 18m) with clay accumulation;
[0037] S2, such as figure 1 Shown, in described clay layer, vertically burying diameter is 45-55mm (preferably 50mm) steel pipe 1, and the muddy water pressure pipe 2 that length is 15-30cm (preferably 20cm) is connected at the bottom of described steel pipe 1 , and offer at least one pressurization hole 21 on the outer peripheral surface of described muddy water pressurization pipe 2; Above described clay layer, be provided with for storing pressurized liquid (the described pressurized liquid is the mixture of bentonite and water, by weight ratio Calculate, the massfraction of described bentonite is 10%-20%) muddy water tank 3 and pressurization device 4, and make described muddy water t...
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Abstract
The invention discloses a construction method for an extension model of a slurry splitting fissure in a clay stratum. The construction method comprises the steps that 1, the clay stratum is formed; 2,a steel pipe is embedded into the clay stratum, a slurry pressurizing pipe is connected to the bottom end of the steel pipe, and pressurizing holes are formed in the peripheral surface of the slurrypressurizing pipe; 3, a pressurizing device is started to form slurry splitting; and 4, it is assumed that the fissure extends in a circular plate-shaped space, the perimeter of the circular plate-shaped space and the time for reaching the perimeter are calculated, or it is assumed that the slurry splitting fissure extends in a semielliptical plate-shaped space and the semiellipse is simplified into a trapezoid, the extension speed of the semi-minor axis of the semielliptical plate-shaped space, the long axis length of the semiellipse and the time for reaching the long axis length are calculated. According to the construction method, parameters such as the extension speed and the total extension amount of the splitting fissure can be calculated through the constructed model, quantization of related parameters in the slurry splitting process is achieved, and reference is provided for studying the slurry splitting extension mechanism.
Description
technical field [0001] The invention relates to the field of underground engineering, in particular to a method for constructing a mud-water splitting fissure extension model in a clay stratum. Background technique [0002] The splitting phenomenon in the soil is still a relatively new subject in the field of soil mechanics and foundations. The existing related researches are all about the splitting of the soil and grouting. The grout splits inside the soil to form grouting cracks and gradually A criss-cross network of pulp veins is formed near the borehole. [0003] The above situation is generally only studied for the grouting effect, and the penetration of the grout in the soil needs to be considered. However, if the grouting rate and pressure reach a certain level, the grout will be under the action of pressure before it can penetrate into the soil. The soil is split, and the subsequent cracks continue to extend to the free ground surface. There is no detailed research ...
Claims
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Inventor 袁大军
Owner BEIJING JIAOTONG UNIV