基于动力触探的砾性土液化判别方法通用性研究

发布时间：2018-06-25 19:57

本文选题：动力触探 + 砾性土液化　；参考：《岩土工程学报》2016年01期

【摘要】：动力触探是针对砾性土力学性能评价的一种原位测试技术,具有设备简单、操作方便等优势。分别在成都平原和美国Utah地区选取典型砾性土场地,进行中美联合动力触探和有效锤击能量的测试与标定,结果表明:1在成都平原3个砾性土场地获取了中国超重型动力触探1321个重锤锤击能量记录,锤击能量传递系数的平均值约为90%,标准差为7.7%,锤击数离散性受设备操作方法的影响较大;2在美国钻机上安装中国超重型动力触探标准探头,可以有效穿透选取的试验深度为20 m的砾性土场地,并进行分层、力学性能评价;3在美国Echo dam下游坝基上2个砾性土场地获取了美国动力触探1438个重锤锤击记录,锤击能量传递系数约为74%,标准差为8.7%,锤击数离散性受拉绳、钻杆摩擦力的影响较大;4对锤击数进行能量修正之后,以2008年汶川地震砾性土液化为背景、以动力触探锤击数为基本指标的砾性土液化判别方法,具有国际通用的可行性。
[Abstract]:Dynamic penetration is an in-situ testing technique for evaluating the mechanical properties of gravel soils. It has the advantages of simple equipment and convenient operation. Typical gravel soil sites were selected in Chengdu Plain and Utah area of the United States, respectively, to test and calibrate the combined dynamic penetration and effective hammering energy between China and the United States. The results show that in 3 gravel soil sites of Chengdu Plain, Wei 1 obtained 1321 energy records of heavy-duty dynamic penetration hammer hammering in China. The average energy transfer coefficient of hammering is about 90 and the standard deviation is 7.7. The dispersion of hammering numbers is greatly affected by the operating methods of the equipment. The gravelly soil site with a test depth of 20 m can be effectively penetrated, and stratified. The mechanical properties of the gravelly soil site on the downstream dam foundation of echo dam in the United States have been evaluated. The dynamic penetration hammer records of 1438 are obtained from 2 gravel soil sites on the downstream dam foundation of echo dam in the United States. The energy transfer coefficient of hammering is about 74 and the standard deviation is 8.7. The number of hammering is dispersed by drawing rope, and the friction of drill pipe has a great influence on hammering number. After the energy correction of hammer number, the liquefaction of gravel soil in 2008 Wenchuan earthquake is the background. The liquefaction discrimination method of gravel soil based on the number of dynamic penetration hammer is feasible and universal in the world.
【作者单位】：中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室;杨百翰大学土木与环境工程系;
【基金】：国家自然科学基金项目(51208477,41272357) 黑龙江省自然科学基金项目(2014GXNSFBA118257)
【分类号】：TU413.5;TU435

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