波速确定地基承载力方法研究  

Research on the Method of Determining Foundation Bearing Capacity by Wave Velocity

作　　者：陈则连 马元 李志华 CHEN Zelian;MA Yuan;LI Zhihua(China Railway Design Corporation,Tianjin 300251,China)

机构地区：[1]中国铁路设计集团有限公司,天津300251

出　　处：《铁道工程学报》2022年第4期17-19,共3页Journal of Railway Engineering Society

基　　金：中国国家铁路集团有限公司重大课题(K2019G031);中国铁路设计集团有限公司重大课题(2019YY120101)。

摘　　要：研究目的:随着物探技术的发展,其在铁路工程地质勘察中的应用越来越广泛,特别是在艰险复杂山区、植被茂密的林区等,物探方法更具优势,有的铁路项目采用了以物探为主的综合勘察模式。但工程设计需要岩土承载力等参数,要研究解决物探精细化、定量化及提供岩土参数问题。本文以黏性土为例,拟研究建立一种基于横波波速确定地基承载力的新方法,通过研究波速与黏性土标贯击数之间的关系,建立波速与标贯击数的关系式,通过实测横波波速计算获得标贯击数,进而确定地基承载力。研究结论:(1)本文研究建立的基于横波波速确定地基承载力的模式准确可靠,在缺少钻探孔的地段是获得地基承载力的有效方法;(2)本文方法在不同地区应结合实地数据加以分析,不可直接套用;(3)地层变化较大的地区不适用本文方法,建议采用常规方法为主;(4)本研究成果可以用于地层结构较简单的山区勘察,精度能够满足铁路初步设计的需求。Research purposes: With the development of geophysical prospecting technology, it is more and more widely used in railway engineering geological prospecting, especially in difficult and complex mountainous areas and dense forest areas. Some railway projects have adopted a comprehensive prospecting mode based on geophysical exploration. However, geotechnical bearing capacity and other parameters are needed in engineering design, so it is necessary to study and solve the problems of refinement and quantification of geophysical exploration and providing geotechnical parameters. Taking clay as an example, this paper intends to establish a new method for determining foundation bearing capacity based on shear wave velocity. By studying the relationship between wave velocity and standard penetration of clay soil, the relational expression between wave velocity and standard penetration blow count is established, and the standard penetration blow count is obtained by calculating the measured shear wave velocity, and then the bearing capacity of foundation is determined. Research conclusions:(1) The model for determining foundation bearing capacity based on shear wave velocity established in this study is accurate and reliable, and it is an effective method to obtain the bearing capacity of foundation in the area without drilling holes.(2) When this method is applied in other areas, it should be analyzed in combination with the field data, instead of directly applying the formula in this study.(3) This method is not applicable to the area with frequent geological mutation where the stratum changes greatly, and conventional investigation is recommended.(4) The research results could be used in mountainous area with simple stratum structure, and the accuracy can meet the demand of preliminary railway design.

关 键 词：横波波速 标贯击数 综合勘察 地基承载力 

分 类 号：TU42[建筑科学—岩土工程] P631.4[建筑科学—土工工程]