T型触探不同截面探头测量结果不确定度分析
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摘要
制作圆形、轴长比为0.5的椭圆形、矩形和菱形截面T型触探探头,分别进行现场试验。采用不确定度评估方法,分析了各种可能的不确定度来源,评价了不同截面形状探头测量结果的不确定度。分析表明,不确定度主要来源于探头表面粗糙度和探头端部,探头加工带来的不确定度很小,可以忽略不计。矩形截面探头测试结果不确定度最小,椭圆形与菱形的不确定度大小相当,圆形的不确定度最大。
T-bar probes with oval, rectangular and rhombus cross section with aspect ratio 0.5 and circular cross section have been made and tested in field. Using the uncertainty evaluation method, various possible sources of uncertainty are analyzed and the measurement results' uncertainty of probes with different cross-section shapes is evaluated. Analysis result shows that the uncertainty is mainly caused by the probe surface's roughness, followed by the probe' end, and the uncertainty caused by the probe processing is very small and can be ignored. The uncertainty of the test results of the rectangular cross-section probe is the smallest, the uncertainty of oval shape and rhombus shape is equivalent, and the circular probe's uncertainty is the largest.
T-bar probes with oval, rectangular and rhombus cross section with aspect ratio 0.5 and circular cross section have been made and tested in field. Using the uncertainty evaluation method, various possible sources of uncertainty are analyzed and the measurement results' uncertainty of probes with different cross-section shapes is evaluated. Analysis result shows that the uncertainty is mainly caused by the probe surface's roughness, followed by the probe' end, and the uncertainty caused by the probe processing is very small and can be ignored. The uncertainty of the test results of the rectangular cross-section probe is the smallest, the uncertainty of oval shape and rhombus shape is equivalent, and the circular probe's uncertainty is the largest.
引文
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[2]RANDOLPH M F,HOULSBY G T.The limiting pressure on a circular pile loaded laterally in cohesive soil[J].Géotechnique,1984,34(4):613-623.
[3]DEJONG J T,YAFRATE N J,DEGROOT D J.Evaluation of undrained shear strength using fullflow penetrometers[J].Journal of geotechnical and geoenvironmental engineering,2011,137(1):14-26.
[4]LUNNE T.The fourth James K.Mitchell lecture:the CPT in offshore soil investigations-a historic perspective[J].Geomechanics and geoengineering,2012,7(2):75-101.
[5]ROBERTSON P K.Interpretation of in-situ testssome insights[EB/OL].[2018-11-29].http://www.marchetti-d mt.it/wp-content/uploads/bibliografia/robertson_2012_mitchell_lecture_ISC4.pdf.
[6]范庆来,栾茂田,刘占阁.软土中T型触探仪贯入阻力的数值模拟[J].岩土力学,2009,30(9):2850-2854.
[7]郭小青.软土贯入仪大变形贯入机理与强度取值方法研究[D].杭州:浙江大学,2016.
[8]王冉冉.全流动贯入仪的室内和离心模型试验研究[D].大连:大连理工大学,2013.
[9]赵维,等.全流动贯入仪的室内和离心模型试验研究[J].北方交通,2013(6):1-5.
[10]沈小克,蔡正银,蔡国军.原位测试技术与工程勘察应用[J].土木工程学报,2016,49(2):98-120.
[11]夏涵,蔡国军,刘松玉.全流触探贯入技术在海洋岩土工程中的应用研究综述[J].工程地质学报,2016,24(增刊):92-197.
[12]季福东,等.海底沉积物工程力学性质原位测量方法[J].海洋地质与第四纪地质,2016,36(3):191-200.
[13]郭绍曾,刘润.静力触探测试技术在海洋工程中的应用[J].岩土工程学报,2017,37(增刊1):207-211.
[14]贾宁,等.T型触探测试软黏土不排水抗剪强度工程实践[J].工程勘察,2016,44(9):17-21,25.
[15]刘朝安,等.椭圆形截面T型触探贯入阻力研究[J].工程地质学报,2016,24(增刊):214-220.
[16]刘朝安,贾宁,孟庆辉.T型触探矩形截面探头特性研究[J].工程地质学报,2017,25(增刊1):440-444.
[17]贾宁,孟庆辉.菱形截面T型触探探头贯入阻力研究[J].电力勘测设计,2018(10):24-28.
[18]贾宁,等.T型触探不同截面形状探头对比研究[J].工程勘察,2018(增刊1):186-197.
[19]JCGM 200:2012.International vocabulary metrologybasic and general concepts and associated ter ms(VIM,3rd Edtion)[EB/OL].[2018-11-29].http://www.pudn.co m/Download/ite m/id/2575020.ht ml.
[20]李慎安.测量结果不确定度的估计与表达[M].北京:中国计量出版社,1997.
[21]WROTH C P.The interpretation of in situ soil tests[J].Géotechnique,1984,34(4):449-489.
[22]RANDOLPH M F,et al.Challenges of offshore geotechnical engineering[C]//The 16th international conference of soil mechanics and geotechnology engineering.Osaka,London:Taylor&Francis,2005.
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