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首页> 外文会议>European conference on soil mechanics and geotechnical >Volumetric water content determination by TDR sensors and Decagons in gravelly soils
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Volumetric water content determination by TDR sensors and Decagons in gravelly soils

机译：用TDR传感器和十进位十进制测定砾石土壤中的体积水含量

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Debris flow and landslide events in an alpine environment depend on factors such as slope inclination, soil and rock mass characterization, vegetation, rainfall infiltration, ice degradation and snowmelt. If rain infiltrates into the ground, the degree of saturation will increase, with a subsequent decrease in suction, and effective stress in the soil. The shear resistance decreases accordingly, which can trigger failure in critical cases, although the loads that act in the soil may remain almost constant A study site is located in a steep alpine slope of a lateral valley of the Rhone valley in Valais. This paper focuses on the prehminary geotechnical monitoring, which includes installation of thermistors, TDR (time domain reflectometry) sensors and Decagon (capacitance/frequency domain technology) sensors to measure the volumetric water content and recording of data to assess the effect of rainfall infiltration on the reduction of shear resistance in the soil. The process of laboratory calibration, placement of the sensors in gravelly soil in the field, and early results from the monitoring will be presented and discussed. Determination of the volumetric water content at discrete points in a slope will correlate to the degree of saturation, and can, through tensiometer measurements of the soil suction or a suitable Water Retention Curve, give valuable information to calculate the change in soil resistance.
机译：高山环境中的泥石流和滑坡事件取决于诸如坡度，土壤和岩体特征，植被，降雨入渗，冰降解和融雪等因素。如果雨水渗入地下，饱和度将增加，随之而来的吸力和土壤有效应力也会下降。尽管在土壤中作用的负载可能保持几乎恒定，但抗剪强度相应降低，这可能会在关键情况下引发破坏。研究地点位于瓦莱州罗纳河谷横向山谷的陡峭高山斜坡上。本文着重于基础岩土监测，包括热敏电阻，TDR（时域反射法）传感器和Decagon（电容/频域技术）传感器的安装，以测量体积水含量，并记录数据以评估降雨入渗对土壤的影响。降低土壤中的抗剪强度。将介绍和讨论实验室校准过程，传感器在野外土壤中的放置以及监测的早期结果。确定斜坡上离散点处的体积水含量将与饱和度相关，并且可以通过对土壤吸力的张力计测量或合适的保水率曲线，提供有价值的信息来计算土壤阻力的变化。

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