Assessing the accuracy of simple field based root strength measurements
Assessing the accuracy of simple field based root strength measurements
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DOI：
10.1007/s11104-013-1765-2
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发表时间：
2013-05
期刊：
影响因子：
4.9
通讯作者：
T. Hales;Clara Cole-Hawthorne;Laurence Lovell;S. Evans
中科院分区：
文献类型：
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作者：
T. Hales;Clara Cole-Hawthorne;Laurence Lovell;S. Evans
背景与目的边坡根系加固是控制滑坡触发的关键措施，但测量难度较大。数十项研究利用广泛的测试方法来了解根的抗拉强度特性，以估计根的钢筋。我们提出了一个系统的尝试来评估简单而有效的现场弹簧尺度方法。方法采用不同的试验方法对云杉根进行强度评价。我们使用弹簧秤在田间测试根系，并在实验室使用通用试验机进行两种不同的预处理。在不同的实验室和现场试验条件下，采用不同的预试验处理、夹紧处的应力集中和间隔类型，对根系强度进行了评估。结果不同垫片和夹紧应力浓度下实验室和现场测得的拉伸强度无显著差异。干燥后未完全复水的根系明显强于湿润的根系，说明水分是影响根系强度的主要因素之一。结论牙根抗拉强度存在较大的自然变异范围。基于现场的弹簧尺度方法产生的结果与更精确的通用测试机器无法区分。
Background and aimsRoot reinforcement of slopes is a key control on landslide triggering, yet remains difficult to measure. Dozens of studies have utilised a wide range of testing methods to understand the tensile strength properties to estimate root reinforcement. We present a systematic attempt to evaluate the simple and efficient field spring scale method.MethodsThis study compared different testing methods to assess the strength ofPicea sitchensisroots. We tested roots in the field using a spring scale and with two different pre-treatments in the laboratory using a universal testing machine. Root strengths were assessed under different testing conditions in laboratory and field experiments using different pre-testing treatments, stress concentration at clamps, and spacer types.ResultsTensile strengths measured in the laboratory and field, with different spacers and clamping stress concentrations were not significantly different in our testing. Roots that were incompletely rehydrated after being dried were significantly stronger than wetter roots, suggesting moisture is one of the dominant controls on root strength.ConclusionsOur results suggest that there is a large range of natural variability in root tensile strength. The field-based, spring scale method produces results that are indistinguishable from those of more precise universal testing machines.