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| Application of the natural source surface wave technique to the evaluation of the site of an urban planning area |
| CHEN Shi1, JIN Rong-Jie2, LI Yan-Qing1, LI Chong-Bo1, HU Zun-Ping1 |
1. Geological Survey Institute of Xinjiang Uygur Autonomous Region,Urumqi 830000,China
2. Beijing Research Institute of Hydropower and Geophysical Surveying,Beijing 100027,China |
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Abstract As a fast and nondestructive geophysical exploration technique,the natural source surface wave technique performs well in exploration in a complex urban environment by extracting surface waves and other information using the natural earth vibration.This study applied this technique in an urban planning area to ascertain the distribution characteristics of the strata in the area through section interpretation,the extraction of site evaluation parameters including equivalent shear wave velocity and predominant period,and 3D visualized plotting.It can be concluded that the planning area has no concealed fault and thus has excellent site conditions.The results of this study can be utilized as an important reference for the site evaluation of similar areas.
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Received: 28 December 2021
Published: 24 February 2023
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Layout of measuring points of natural source surface wave array
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Work deployment of natural source surface wave
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Surface wave field test results
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| 岩性 | vs/(m·s-1) | | 砂土层 | <400 | | 卵砾石 | 400~700 | | 风化泥岩 | >700 |
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List of wave velocities of main strata in the planning area
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Dispersion curves of different side lengths
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| 最大边长/m | 最大探测深度/m | 深度系数 | | 24 | 133 | 5.5 | | 36 | 145 | 4.0 | | 48 | 171 | 3.6 | | 64 | 190 | 3.0 |
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Detection range of array with different side lengths
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Dispersion curve of array comparison test points
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Single point interpretation results of natural source surface wave QZ1 line QZ87(a) and QZ127(b)
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Profile of comprehensive geophysical interpretation of QZ1 line with natural source surface wave technology
a—contour map of Rayleigh wave velocity vr of QZ1 line;b—geological profile of QZ1 line
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| 线号 | 测点数 | Ⅱ类 | Ⅲ类 | 质量评述 | | QZ1 | 41 | 41 | 0 | Ⅱ类场地占比88.57%,Ⅲ类场地占比11.43%。 | | QZ2 | 44 | 37 | 7 | | QZ3 | 30 | 23 | 7 | | QZ4 | 30 | 27 | 3 | | QZ5 | 30 | 27 | 3 | | 合计 | 175 | 155 | 20 |
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Statistics of different site types in the planning area
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Excellent period acquisition interface of WD-1 intelligent surface wave instrument
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| 卓越周期T/s | 场地土类型 | | T<0.17 | 坚硬场地土(I) | | 0.17≤T<0.30 | 中硬场地土(II) | | 0.30≤T<0.53 | 中软场地土(III) | | T≥0.53 | 软弱场地土(IV) |
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Classification standards for soil types of different sites in the planning area
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| 线号 | 点数 | Ⅰ | 百分比/% | Ⅱ | 百分比/% | Ⅲ | 百分比/% | | QZ1 | 41 | 6 | 15 | 23 | 56 | 12 | 29 | | QZ2 | 44 | 10 | 23 | 24 | 55 | 10 | 23 | | QZ3 | 30 | 0 | 0 | 2 | 7 | 28 | 93 | | QZ4 | 30 | 0 | 0 | 29 | 97 | 1 | 3 | | QZ5 | 30 | 14 | 47 | 15 | 50 | 1 | 3 | | 合计 | 175 | 30 | 17.14 | 93 | 53.14 | 52 | 29.71 |
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Statistics of soil types of different sites in the planning area
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3D visualization graphics processing flow
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3D geological results of the planning area
a—3D map of the whole area;b—enlarged drawing of intersection of QZ1 line;c—enlarged drawing of intersection of QZ2 line
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