Detection of the potential failure zones of the unstable slopes along highway using comprehensive geophysical methods
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摘要:
为查明公路边坡滑面分布情况，采用瞬态面波和对称四极电测深法进行综合物探勘察，成功识别出滑动面以及潜在滑面位置、形态和范围，再结合钻孔，得出滑坡体地质剖面，高效准确的为滑坡处治设计提供了基础资料。工程实例应用表明，瞬态面波成像在滑动面以及潜在滑面识别中准确直观，且可以提供波速参数；电测深法能够提供不同地质体的电阻率参数，可以对瞬态面波进行有效补充；两种方法互相结合，可以较大限度的降低物探多解性，结合少量钻孔，能提供较为准确的滑坡体地质剖面，可在公路不稳定斜坡探测中发挥重要作用。
Abstract:In order to find out the slip surface of the highway slope, the transient surface wave and the symmetric four-level electrical sounding method were used for comprehensive geophysical exploration. The position, shape and range of the potential slip surface were successfully identified. The geological section of the sliding body can be efficiently and accurately provided with basic data for landslide treatment design. The application of engineering examples shows that transient surface wave imaging is accurate and intuitive in the identification of sliding surface and, and can provide wave speed parameters; electrical sounding method can provide resistivity parameters of different geological bodies, and can perform transient surface waves. the combination of the two methods can greatly reduce the ambiguity of geophysical prospecting. Combined with a small number of drilling holes, it can provide a more accurate landslide body geological profile, which can play an important role in the detection of unstable highway slopes.
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Key words:
- highway /
- landslide /
- transient surface wave /
- electrical sounding /
- detection
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表 1 地质体中
${V_{\rm{r}}}$ 、${V_{\rm{s}}}$ 关系表Table 1. Relationship of Vr and Vs in geological body
泊松比 0.25 0.38 0.40 0.50 Vr /Vs 0.920 0.939 0.943 0.955 
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表 2 研究区电阻率实测参数表
Table 2. Measured parameters of resistivity in study area
岩性 电阻率值ρ/(Ω·m) 表现特征 黏土层 <200 等值线平滑 稳定堆积体（冰水堆积层） 200～500 等值线紊乱 基岩 >500 等值线平滑 滑面 <200 低阻闭合圈
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表 3 研究区横波波速实测参数表
Table 3. Measured parameters of shear wave velocity in study area
岩性 横波波速v/(m·s−1) 表现特征 粘土层 <200 低速层 稳定堆积体（冰水堆积层） 200～1000 波速变化大 滑面 <200 低速带
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