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Vibration-assisted static sounding method and application
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A static penetration and vibration technology, applied in the field of foundation soil survey, construction, infrastructure engineering, etc., can solve problems such as no application value, avoid the impact of uncertainty, increase the scope of application, and have strong pertinence Effect
Active Publication Date: 2020-09-01
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 application, and belongs to the field of geotechnical engineering investigation in-situ test. The vibration-assisted static sounding method comprises the following steps of step 1, positioning and preparing a vibration-assisted static sounding instrument; step 2, performing static press-in of a probe, and reading data, whereinthe press-in speed is 0.015 to 0.025 m / s, and the soil press-in resistance is inversely proportional to the press-in speed; step 3, performing vibration press-in of the probe, and recording the vibration completing depth; step 4, alternating the vibration type press-in and the static press-in, and changing the press-in into static press-in after the vibration type press-in enters a next cycle; andstep 5, exporting and correcting the data, and multiplying the data of a vibration part by different regulation coefficients according to different depths to finally obtain the test data after the vibration-assisted static sounding correction. The vibration-assisted static sounding method has the advantages that the vibration-assisted static sounding instrument is specified; meanwhile, after thedata is processed, the effect of direct utilization is achieved; and the expanded application range of the vibration-assisted static sounding technology is realized.
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...
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