本文選題：動力觸探 + 礫性土液化　； 參考：《巖土工程學(xué)報》2016年01期

【摘要】：動力觸探是針對礫性土力學(xué)性能評價的一種原位測試技術(shù),具有設(shè)備簡單、操作方便等優(yōu)勢。分別在成都平原和美國Utah地區(qū)選取典型礫性土場地,進行中美聯(lián)合動力觸探和有效錘擊能量的測試與標(biāo)定,結(jié)果表明:1在成都平原3個礫性土場地獲取了中國超重型動力觸探1321個重錘錘擊能量記錄,錘擊能量傳遞系數(shù)的平均值約為90%,標(biāo)準(zhǔn)差為7.7%,錘擊數(shù)離散性受設(shè)備操作方法的影響較大;2在美國鉆機上安裝中國超重型動力觸探標(biāo)準(zhǔn)探頭,可以有效穿透選取的試驗深度為20 m的礫性土場地,并進行分層、力學(xué)性能評價;3在美國Echo dam下游壩基上2個礫性土場地獲取了美國動力觸探1438個重錘錘擊記錄,錘擊能量傳遞系數(shù)約為74%,標(biāo)準(zhǔn)差為8.7%,錘擊數(shù)離散性受拉繩、鉆桿摩擦力的影響較大;4對錘擊數(shù)進行能量修正之后,以2008年汶川地震礫性土液化為背景、以動力觸探錘擊數(shù)為基本指標(biāo)的礫性土液化判別方法,具有國際通用的可行性。
[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.
【作者單位】： 中國地震局工程力學(xué)研究所中國地震局地震工程與工程振動重點實驗室;楊百翰大學(xué)土木與環(huán)境工程系;
【基金】：國家自然科學(xué)基金項目(51208477,41272357) 黑龍江省自然科學(xué)基金項目(2014GXNSFBA118257)
【分類號】：TU413.5;TU435

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