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Method and Application of Vibration-Assisted Static CPT
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A static penetration and vibration technology, used in construction, infrastructure engineering, field foundation soil survey, etc., can solve problems such as no application value, and achieve the effect of simple and clear operation process, improved application scope, and accurate survey.
Active Publication Date: 2021-11-16
天津市勘察设计院集团有限公司
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Problems solved by technology
However, due to the increase of vibration force in this process, the effect of traditional static sounding has been changed. If there is no specific test process and data processing method, the vibration-assisted static sounding technology will have no application value, so this technology was invented. The test process and data processing method are very practical
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Embodiment 1
[0069] Example 1: Site survey of Qingguang Demonstration Town, Beichen District, Tianjin, the geological conditions are as follows:
[0070] The buried depth of the site is more than 60 meters, and the layered soil in the horizontal direction is relatively uniform, and the vertical layer is distributed in layers. The stratum is as follows:
[0071] Burial depth 0-1.0m: artificial fill layer (Qml) plain fill (stratum number ① 2 ), brown, soft plastic state, silty clay, belonging to medium compressive soil;
[0072] Burial depth of 1.0-2.5 meters: recent alluvium (Q 4 3N al) Silt soil (stratum number ③ 1 ), brownish-yellow, slightly dense, without bedding, ferrous, partly silty clay, belonging to medium (low) compressibility soil;
[0073] Burial depth of 2.5-6.0 meters: recent alluvium (Q 4 3N al) Clay (stratum number ③ 2 ), brownish-gray, plastic to soft plastic state, without bedding, iron-containing, belonging to highly compressible soil;
[0074] Burial depth of 6.0...
Embodiment 2
[0095] Example 2: The investigation project of Xinhua Road Stadium in Heping District, Tianjin, the geological conditions are as follows:
[0096] The buried depth of the site is more than 50 meters, and the stratified soil in the horizontal direction is relatively uniform, and the vertical distribution is layered. The stratum is as follows:
[0097] Burial depth 0-1.5 meters: artificial filling layer (Qml) miscellaneous filling (stratum number ① 1 ), in a mottled, loose state, composed of bricks, concrete slag, waste soil, etc.;
[0098] Buried at a depth of 1.5-5.0 meters: the continental alluvium of the Upper Holocene Formation (Q 4 3 al) Silty clay (stratum number ④ 1 ), grayish yellow, plastic state, no bedding, ferrous, belonging to medium compressibility soil;
[0099] Buried at a depth of 5.0-6.5 meters: the continental alluvium of the Upper Holocene Formation (Q 4 3 al) Silt soil (stratum number ④ 2 ), greyish-yellow, slightly dense state, no bedding, ferrous, ...
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Abstract
The invention provides a vibration-assisted static sounding method and its application, belonging to the field of in-situ testing of geotechnical engineering surveys, comprising the following steps: S1, positioning and preparation of a vibration-assisted static sounding instrument; S2, static sounding of a probe rod Force pressing and data reading, the pressing speed is 0.015-0.025 meters per second, the pressing resistance of the soil is inversely proportional to the pressing speed; S3, vibrating pressing of the probe rod, and record the end depth of vibration; S4, vibration Alternate press-in and static press-in, vibratory press-in enters the next cycle and changes to static pressure; S5, data export and correction, multiply the data of the vibration part by different adjustment coefficients according to different depths, and finally get Corrected test data of vibration-assisted static penetration testing. The invention standardizes the vibration-assisted static penetration sounder, and at the same time processes the data to achieve the effect of direct utilization, and realizes the expanded application range of the vibration-assisted static penetration sounder.
Description
technical field [0001] The invention belongs to the field of in-situ testing of geotechnical engineering survey, and relates to a vibration-assisted static penetration method and its application. Background technique [0002] Static CPT refers to using the pressure device to press the probe with the sensor into the test soil layer through the probe rod. The probe rod is a hollow steel pipe. The data transmitted to the computer on the ground mainly includes information such as depth, cone tip resistance and side friction resistance (the single bridge probe has no side friction resistance). Through the analysis of these mechanical data, the properties of the soil layer at the depth of the position can be judged. In the geotechnical engineering investigation industry, static penetration testing is mainly used in alluvial plain areas, and it is mainly aimed at shallow soils. The main reason is that with the increase of depth, the strength of the soil increases, and static pressu...
Claims
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