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| The application of natural source surface wave technology to urban geological survey of Urumqi |
| Shi CHEN1, Yan-Qing LI1, Tong-He LI1, Rong-Jie JIN2, Jing ZHANG1 |
1. Geological Survey Institute of Xinjiang,Urumqi 830000,China
2. Beijing Research Institute of Hydropower and Geophysical Surveying,Beijing 100027,China |
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Abstract Natural source surface wave technology which is a traditional geophysical exploration method is widely used in shallow geological survey and engineering site evaluation.In this paper,the experimental application of natural source surface wave technology in urban geological survey of Urumqi is introduced.By measuring the velocity structure of surface wave at a single point,the strata and structures in the area are delineated,and a number of engineering parameters for site evaluation are obtained.Through application and research,it is verified that natural source surface wave technology can be effectively used in urban areas characterized by dense population,complex environment and serious disturbance.The application process of natural source surface wave technology in urban geological survey is established.The results have guiding significance for the further exploration of urban underground space resources.
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Received: 25 January 2019
Published: 28 November 2019
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| 地层 | 岩性 | 横波速度/(m·s-1) | | Q | 第四系冲积砂或土
砂砾石
砂卵砾石
卵砾石(深部) | <400
400~600
600~1200
>1200 | | J | 砂岩
泥质砂岩
泥岩 | 400~700
700~1300
>1300 |
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S-wave velocity range of different strata in the investigation area
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Working deployment map of natural source surface wave in investigation area
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Layout method of natural source surface wave technology station
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Data processing flow of natural source surface wave technology
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| 地层 | 岩性 | 底界深度/m | 深度误差
/% | | 钻孔 | 天然源面波 | | 第四系 | 粉砂、粉土 | 11.00 | 10.60 | 3.64 | | 碎石 | 19.20 | 18.30 | 4.69 | | 侏罗系齐古组 | 砂岩 | 33.20 | 33.90 | 2.11 | | 泥质砂岩 | — | — | — |
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Comparison of natural source surface wave and drilling results at ZK13 point
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Dispersion curve interpretation and borehole column map of natural source surface wave technology at ZK13 point
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Interpretation results of S-wave velocity contour of WT6 line
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Engineering Geological Profile of WT6 Line
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| 土的类型 | 等效剪切波速
/(m·s-1) | 场地类别 | | Ⅰ0 | Ⅰ1 | Ⅱ | Ⅲ | Ⅳ | | 岩石 | vse>800 | 0 | | | | | | 坚硬土或软质岩石 | 800≥vse>500 | | 0 | | | | | 中硬土 | 500≥vse>250 | | <5 | ≥5 | | | | 中软土 | 250≥vse>150 | | <3 | 3~50 | >50 | | | 软弱土 | vse≤150 | | <3 | 3~15 | >15~80 | >80 |
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Classification of sites by equivalent S-wave velocity
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Contour map of equivalent S-wave velocity in survey area
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| 土的类型 | 等效剪切波速/(m·s-1) | 面积/km2 | 比例/% | | 坚硬土或软质岩石 | 800≥vse>500 | 63.19 | 14.46 | | 中硬土 | 500≥vse>250 | 346.27 | 79.26 | | 中软土 | 250≥vse>150 | 27.43 | 6.28 |
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Area statistical table of different site categories in the survey area
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Contour map of bedrock top interface depth in survey area
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Contour map of preeminent period in survey area
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| 场地土类型 | 卓越周期T/s | 面积/km2 | 比例/% | | Ⅰ——坚硬场地土 | 010≤T<0.20 | 116.59 | 26.69 | | Ⅱ——硬而厚场地土 | 0.20≤T<0.40 | 301.48 | 69.01 | | Ⅲ——软而较厚场地土 | 0.40≤T<0.60 | 18.82 | 4.30 | | Ⅳ——异常松场地土 | T≥0.60 | 0 | 0 |
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Area statistical table of different site soil types in investigation area
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| 测点编号 | 地脉动卓越周期
/s | 等效剪切波速
vse/(m·s-1) | 覆盖层厚度
dov/m | 土的类型 | 测点所在位置
建筑场地类别 | | WT6-14 | 0.285 | 412.12 | 23.15 | 中硬土 | Ⅱ | | WT6-62 | 0.41 | 530.94 | 4.5 | 软质岩石 | Ⅰ1 |
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Site evaluation of natural source surface wave
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Application process of natural source surface wave technology in urban geological survey
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