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首页> 外文期刊>Tunnelling and underground space technology >Underground survey to locate weathered bedrock depth using noninvasive microtremor measurements in Jurong sedimentary formation, Singapore
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Underground survey to locate weathered bedrock depth using noninvasive microtremor measurements in Jurong sedimentary formation, Singapore

机译：使用无创微震测量技术在新加坡裕廊沉积地层中进行风化基岩深度的地下勘测

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Determination of bedrock depth is an essential part of design/alignment/initial planning of any infrastructure projects such as tunneling, foundations and underground utilities. Drilling a borehole to identify the depth of bedrock is often time consuming, costly and cumbersome process. In the present study, microtremor methods are used to identify the depth of weathered bedrock. Series of ambient microtremor array measurements (MAM) and 3-component microtremor methods are conducted in the weathered rock of Jurong formation in Singapore. Based on these surface wave measurements and available reference borelog information, three different approaches - (1) shear wave velocity (V-s) based approach; (2) wavelength based approach and (3) Horizontal to Vertical Spectral Ratio (HVSR) approach - are proposed to identify the depth of bedrock in the Jurong formation. For the V-s based approach, a specific reference value of V-s is suggested to estimate the depth of bedrock in the Jurong formation, which is readily determined by the V-s profile. In the wavelength based approach, an experimental dispersion curve in the form of wavelength and phase velocity is found able to identify a deviation point that can be used for predicting the corresponding bedrock depth. A relationship between the deviation point in wavelength and bedrock depth has been established. In the HVSR based approach, an empirical correlation model is formed between the natural frequency obtained from the HVSR profile and the bedrock depth information. To conclude, all three approaches can provide overall reasonable estimates in the depth of bedrock although the V-s based approach is slightly better in statistics, followed by HVSR based approach. In practice, the HVSR approach would be easy to implement in terms of field testing and analysis.
机译：确定基岩深度是任何基础设施项目（例如隧道，地基和地下公用事业）的设计/对准/初始规划的重要组成部分。钻孔以确定基岩的深度通常是耗时，昂贵和麻烦的过程。在本研究中，微震方法用于确定风化基岩的深度。在新加坡句容组的风化岩石中进行了一系列环境微震阵列测量（MAM）和三分量微震方法。基于这些表面波测量结果和可用的参考井眼信息，三种不同的方法-（1）基于剪切波速度（V-s）的方法； （2）基于波长的方法和（3）水平-垂直光谱比（HVSR）方法-提出以识别裕廊地层中基岩的深度。对于基于V-s的方法，建议使用V-s的特定参考值来估算裕廊地层的基岩深度，这很容易由V-s剖面确定。在基于波长的方法中，发现波长和相速度形式的实验色散曲线能够识别偏差点，该偏差点可用于预测相应的基岩深度。已经建立了波长偏离点与基岩深度之间的关系。在基于HVSR的方法中，从HVSR剖面获得的固有频率与基岩深度信息之间形成了经验相关模型。总而言之，尽管基于V-s的方法在统计上稍好一些，但其次是基于HVSR的方法，所有这三种方法都可以提供基岩深度的总体合理估计。实际上，HVSR方法在现场测试和分析方面将很容易实施。

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