高速铁路中深厚全风化花岗岩地基处理探讨  

Discussion on Treatment of Deep Completely Decomposed Granite Foundation of High-speed Railway

作　　者：黄建川[1] 隋孝民[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《铁道工程学报》2011年第12期31-34,48,共5页Journal of Railway Engineering Society

摘　　要：研究目的:高速铁路穿越深厚全风化花岗岩地段时,由于全风化花岗岩压缩性较大,再加之高速铁路对路基工后沉降的要求极为严格,因此需寻找一种深厚全风化花岗岩地基处理设计的合理方法。本文以工程实例说明了全风化花岗岩天然地基沉降计算的方法,并深入探讨了地基处理设计时应注意的问题。研究结论:室内固结试验测得的全风化花岗岩的压缩指标可信度不高,采用此指标进行地基处理设计时容易造成浪费。采用标准贯入试验获得的压缩指标相对准确,可用于进行地基处理设计,但变形模量与标贯击数之间经验关系的准确性与适用性应结合当地花岗岩特性需要进一步研究。Research purposes： When the high -speed railway passes through deep completely decomposed Granite zones, it is necessary to search for a reasonable method for treatment design of deep completely decomposed granite foundation because the compressibility of completely decomposed granite is big and the post - construction settlement of high -speed railway should be controlled strictly. By taking an example, this paper explains the reasonable calculation method for the natural foundation settlement and deeply discusses the matter for caution in design of foundation treatment.Research conclusions：The compression indexes of completely decomposed granite obtained from laboratory test are of low reliability, and using these indexes can easily cause the waste in foundation treatment consolidation design. The compression indexes obtained from the standard penetration test are relatively accurate and can be used for the design, but the accuracy and applicability of empirical relation between deformation modulus and SPT blow count is worth further studying in combination with the properties of local decomposed granite.

关 键 词：全风化花岗岩 地基处理 沉降 CFG桩 

分 类 号：U213.1[交通运输工程—道路与铁道工程]