【摘 要】
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Revealing the evaluation characteristics of desiccation cracks and strain status of soil during drying process is significant for various geotechnical,agricultural and environmental applications.In th
【机 构】
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School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China
【出 处】
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第六届地质(岩土)工程光电传感监测国际论坛
论文部分内容阅读
Revealing the evaluation characteristics of desiccation cracks and strain status of soil during drying process is significant for various geotechnical,agricultural and environmental applications.In this paper,a model box with 200cm long,15cm wide and 20cm high was designed for carrying out soil desiccation test.The development of cracks on soil surface was monitored by a camera which was fixed above the box.Polyurethane optical fibers were embedded at four different depths of the soil specimen,and the newly developed Pulse-Prepump Brillouin Optical Time Domain Analysis(PPP-BOTDA)sensing technique with high resolution was used to monitor the shrinkage strain of soil during drying process.The results indicate that the BOTDA is fully feasible to be applied in soil shrinkage strain monitoring.In this test,the strain distribution curves of the optical fiber can obviously reflect soil shrinkage characteristics and also crack initiation positions.Compared with the actual crack image pattern,it is found that bigger cracks usually correspond to higher strain and the strain increases exponentially with increasing crack width.It can be concluded that the PPP-BOTDA is a very effective tool for soil desiccation cracking study.
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