No-fill vibro-shock test device and test method for simulating in-situ stress state sandy soil
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A technology of in-situ stress and test methods, applied in the direction of measuring devices, adopting mechanical devices, analyzing materials, etc., can solve the problems that cannot meet the actual requirements, and achieve the effect of strong operability
Active Publication Date: 2022-06-28
NANJING HYDRAULIC RES INST
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Problems solved by technology
[0007] For this reason, the technical problem to be solved by the present invention is to overcome the problem that the existing vibro-shock model test in the prior art cannot meet the actual requirements, and provide a kind of filler-free vibro-shock test device and test method for simulating in-situ stress state sandy soil, It can be used to simulate the vibro-shock test process of sandy soil in the actual stress state indoors, and provide reliable technical support for the study of the vibro-shock reinforcement effect and reinforcement mechanism of sandy soil foundations
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Embodiment 1
[0051] refer to figure 1 As shown, a non-filler vibration shock test method for simulating in-situ stress state sand of the present invention includes the following steps:
[0052] S1. The model sand sample 18 is prepared in the model box 1 by the sand rain method, and the initial density and relative compactness of the sand in the model sand sample 18 are controlled by adjusting the height of the falling sand;
[0053] In the present embodiment, the specific process of preparing the model sand sample 18 is as follows:
[0054] First of all, if the artificially prepared model sand sample 18 is to be similar to the sand state in the actual foundation, it is necessary to control the density and initial compactness of the sand in the model sand sample 18. The model sand sample 18 was prepared by the sand-rain method, and it was found that the model sand sample 18 prepared by the sand-rain method was most similar to the in-situ sand, and the variables of the falling-sand in the s...
Embodiment 2
[0075] In order to complete the above test method, the present invention also provides a non-filler vibration shock test device for simulating in-situ stress state sand to realize the test method, and the test device includes:
[0076] model box 1;
[0077] Sand rain sample preparation system, preparing model sand samples 18 in the model box 1;
[0078] a vertical stress loading system, which applies vertical consolidation stress to the model sand sample 18;
[0079] The vibrator 19 applies a vibratory load to the model sand sample 18;
[0080] The vibrator coding controller 20 adjusts the penetration, pulling speed and segmented vibration retention time of the vibrator 19 in the model sand sample 18;
[0081] The saturated water tank 21 is communicated with the bottom of the model box 1, and water is injected into the model box 1 to realize the slow saturation of the model sand sample 18;
[0082] Sensor and dynamic signal test and analysis system 27, the sensor includes a...
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Abstract
The present invention relates to a vibrating test device and test method without filler for simulating in-situ stress state sandy soil, comprising the following steps: S1, preparing model sand samples in a model box by using the sand rain method, and controlling the model sand by adjusting the falling sand height The initial density and relative compactness of the sand in the sample; S2. Apply vertical stress to the model sand sample to realize the consolidation of the model sand sample to simulate the in-situ stress state of the sand; S3. After the consolidation is completed, use vibration The vibro impactor applies a vibro-shock load to the model sand sample, and adjusts the penetration, up-drawing speed and sub-vibration retention time of the vibro-impacter in the model sand sample to simulate the actual vibro-shock reinforcement process; S4. During the vibro-shock reinforcement process, Through the multi-channel dynamic signal test and analysis system, the array of pore pressure sensors, earth pressure sensors, and acceleration sensors, the physical quantities of dynamic soil stress, pore pressure and acceleration of the model sand sample under the action of vibroshock are monitored in real time. The invention can simulate the vibro-shock test process of the sandy soil in the actual stress state.
Description
technical field [0001] The invention relates to the technical field of geotechnical engineering foundation treatment, in particular to a non-filler vibration shock test device and a test method for simulating in-situ stress state sand. Background technique [0002] Vibration method is widely used to strengthen weak foundations. Because of the advantages of simple process, convenient construction, short construction period, economical and practical, and obvious effect, this method has been widely used in port engineering, water conservancy engineering, traffic engineering and construction engineering. [0003] Vibration without filler is a kind of vibratory method. It has become one of the most commonly used reinforcement methods for sandy foundations at present because of its economical and practical advantages and the advantages of not using "three materials" (rebar, cement, sand). The non-filler vibrating method uses the self-weight and horizontal vibration of the vibrator...
Claims
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