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Observation and Use of Soil Suction, 20 Years of Experience

机译：吸泥的观察和使用，已有20年的经验

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Measurement of soil suction is one tool available for evaluation of unsaturated soils. It can be invaluable in estimating the depth of the active zone as well as correlating results from more expensive and time-consuming swell tests. Suction profiles can also be used to evaluate saturated lenses within the vadose zone as an aid to, or in some cases in lieu of, nested piezometers. Many engineers attempt to assign too much "accuracy" to the results, and consequently get hung up on what the results actually mean. An example of this is the current use of suction values and theoretical, but incorrect, suction profiles by the Post Tensioning Institute's (PTI) slab-on-ground design procedure. The procedure correlates changes in total suction to volumetric movement. The vast majority of research indicates that it is a change in matric suction that drives soil movement. Soil suction is also a stress state variable, not a stress variable. The difference is that a state variable can be used to evaluate the state of a material, not the actual stress. In unsaturated soils, this means that the suction value can be used to evaluate, for example, if the soil is dry and potentially expansive. However, the suction cannot be used as a stress variable, meaning that a change in the suction value is not the same as a change in stress. This paper discusses the various methods and limitations of measurement of suction and its practical use in geotechnical engineering. Examples of both the effective use and misuse of suction are presented.
机译：土壤吸力的测量是可用于评估非饱和土壤的一种工具。在估算活动区的深度以及关联更昂贵和耗时的膨胀测试的结果时，这可能是无价的。吸气曲线也可用于评估渗流区内的饱和晶状体，以辅助（或在某些情况下）代替嵌套式压力计。许多工程师试图为结果分配过多的“准确性”，因此迷上了结果的实际含义。一个示例是后张拉力研究所（PTI）的地面平板设计程序当前使用的吸力值和理论吸力分布，但使用方法不正确。该程序将总吸力的变化与容积运动相关联。绝大多数研究表明，基质吸力的变化驱动土壤运动。土壤吸力也是应力状态变量，而不是应力变量。不同之处在于状态变量可用于评估材料的状态，而不是实际应力。在非饱和土壤中，这意味着吸力值可用于评估例如土壤是否干燥以及是否可能膨胀。但是，吸力不能用作应力变量，这意味着吸力值的变化与应力的变化不同。本文讨论了吸力测量的各种方法和局限性及其在岩土工程中的实际应用。给出了有效使用和滥用吸力的示例。

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