延吉-珲春地区的圆砾层是该区域工程建设经常利用的土层。为了获取圆砾层可靠的地基承载力数据，本文探讨确定地基承载力适宜的测试手段和方法，以及检验以前地基承载力数据的可靠度，采用载荷试验和重型圆锥动力触探试验原位测试方法对圆砾层的地基承载力进行了测试研究，获取了十二组地基承载力特征值、变形模量和重型圆锥动力触探锤击数试验数据。通过对试验数据的统计分析，得到了圆砾层地基承载力特征值的范围，得出地基承载力特征值、变形模量与重型圆锥动力触探锤击数线性相关的结论。据此，提出了适合当地工程地质条件的根据重型圆锥动力触探锤击数计算圆砾层地基承载力特征值和变形模量的经验公式。为延吉-珲春地区岩土工程勘察工作能够准确可靠、便捷、经济地确定圆砾层地基承载力特征值和变形模量提供了依据和方法，并为吉林省其他地区圆砾层地基承载力的研究提供了参考。%Round gravel stratum is the commonly used soil in engineering construction in Yanji - Hunchun area. In order to achieve reliable data about the characteristic value of subgrade bearing capacity of round gravel stratum , to approach appropriate measures for determining the characteristic value of subgrade bearing capacity , to test the de-gree of reliability of bearing capacity datum in former worke, in-situ testing methods including loading test and heavy dynamic penetration test ( DPT) are taken for study the round gravel stratum and twelve sets of data which a-bout characteristic value of subsoil bearing capacity and deformation modulus and about blow counts of DPT are col-lected. Through the statistical analysis of the test data, get the characteristic value of subgrade bearing capacity of the range of round gravel stratum. That the characteristic value of subgrade bearing capacity and blow counts of DPT linear related conclusion, so the deformation modulus and blow counts of DPT linear related conclusion. Ac-cording to the conclusion, two experimental formulas adapting to the local engineering geological condition are pro-posed, one of which is for determining the characteristic value of subgrade bearing capacity of round gravel stratum by blow counts of DPT, the other is for determining deformation modulus by blow counts of DPT. The research is helpful to geotechnical engineering investigation work which can provide characteristic value of subgrade bearing ca-pacity and deformation modulus of round gravel stratum reliably, accurately, conveniently, economically in Yanji-Hunchun area, and provide experience for other regions in Jinlin Province.
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