摘要
研究目的:目前在我国大部分平原地区岩土勘察中采用的常规触探设备对于比贯入阻力40～50 MPa的硬土层很难穿透,孔深仅能达到25～40 m,触探深度已经不能满足现阶段的高层、高速铁路及高速公路等工程勘察需要,这个问题已引起岩土工程界的普遍重视。研究结论:(1)采用双桥静力触探、三桥旋转触探、钻探取样、平板载荷试验、剪切波测试等多种原位测试手段,其中所采用的三桥旋转触探技术是一种全新的深层原位测试方法,在本场地触探深度达到了60 m,有效解决了常规的静力触探孔不能穿透硬层、测试深度不足的问题;(2)通过采用对比分析和相互验证的方法,查明了场地范围内地基土时代成因、岩性特征及其分布规律;(3)达到了提高勘探质量、缩短勘测周期和降低成本的目的,为工程设计提供了可靠的设计参数及切实可行的地基基础设计建议。
Research purposes： At present in our country, geotechnical investigation uses the conventional sounding equipment in the plain, and it is difficult to penetrate hard soil which penetration resistance is 40 - 50 MPa, and borehole depth can only achieve 25 - 40 m. Sounding depth can not satisfy the need of engineering investigation for the high- rise building, high -speed railway and highway. The problem has caused wide attention in geoteehnical engineering field.Research conclusions： （ 1 ） This paper adopts several in - test, three bridge rotating penetration test, sample drilling situ testing methods such as double bridge cone penetraUon , slab loading test, shear wave test. The three bridge rotating penetration test technology is a new species of in - situ test techniques which overcome the problem as conventional sounding can not penetrate the hard layer and the test depth inadequate, and its penetration depth can reach 60 m in this field. （2） This paper use the method of contrast analysis and mutual verification find out the cause of foundation soil era, lithologic features and its distribution law. （3） Thus improved the quality of exploration, shorten the cycle of survey and lower the cost, provides a reliable design parameters and practical foundation design suggestions for engineering design.
出处
《铁道工程学报》
EI
北大核心
2011年第12期15-20,共6页
Journal of Railway Engineering Society
关键词
原位测试
场地地基
浅基础
桩基础
in -situ tests
site foundation
shallow foundation
pile foundation
