花岗岩强风化岩块和残积土岩土混合料填土强夯后的抗剪强度
摘要:2011年珠海××港××项目兴建高达44 m、总长达2600 m的高填方人工边坡,其填料为花岗岩强风化岩块和残积土的岩土混合料,经分层强夯处理形成高边坡,边坡设计需要这种经强夯处理后的岩土混合料的抗剪强度,为此,进行了大型原位直剪试验,获得强夯处理后岩土混合料本身的内摩擦角φ=38°、黏聚力c=101.4 kPa,岩土混合料与原始地面交界面的内摩擦φ=39.1°、黏聚力c=108.9 kPa。为什么强夯后的岩土混合料会有较高的黏聚力?分析认为,其原因是花岗岩岩土混合料的总黏聚力由强风化岩块的抗剪断黏聚力、残积土的原始黏聚力和强夯后的加固黏聚力共同组成。
Abstract:A high slope,with height up to 44 m and length up to 2600 m,was filled with the rock-soil mixture material of weathered granite blocks and residual soil after dynamic compaction in Zhuhai.China.The design of slope needs the shear strength of the mixture material.The large-scale in-situ direct shear test was carried out and the strength parameters are as follows:angle of internal friction φ=38°,cohesion c=101.4 kPa,angel of internal friction and cohesion between fill material and natural ground,φ=39.1°,c=108.9 kPa,respectively.The special research on the mixture material shows large cohesion values after dynamic compaction.It can be explained that granite rock-soil mixture material total cohesion consists of the shear cohesion of strong weathered rock,the residual soil's original clay cohesion and the stabilized cohesion after compaction.
中文标题:
花岗岩强风化岩块和残积土岩土混合料填土强夯后的抗剪强度
The Shear Strength Research on Rock-Soil Mixture Material of Weathered Granite Blocks and Residual Soil after Dynamic Compaction
作者:
张旷成1,朱杰兵2,陈明1
Zhang Kuangcheng1,Zhu Jiebing2,Chen Ming1
作者简介:张旷成,男,1930年生,1952年毕业于川北大学(后合并于今重庆大学)土木工程系,教授级高级工程师,首批中国工程勘察大师,一直从事岩土工程勘察、设计和研究工作。E-mail:chenming729@qq.com
通讯地址:
1. 深圳市勘察测绘院有限公司, 广东深圳 518028; 2. 长江水利委员会长江科学院, 湖北武汉 430010
1.ShenzhenGeotechnicalInvestigationSurveyingInstituteCo.,Ltd,Shenzhen518028,Guangdong,China; 2.ChangjiangRiverScientificResearchInstitute,Wuhan430010,Hubei,China
中图分类号:TU45;TU432
doi:10.3969/j.issn.1007-2993.2016.01.004
出版物:岩土工程技术
收稿日期:2015-05-18
关键词:岩土混合料,强夯,原位直剪试验,抗剪断黏聚力,原始黏聚力,加固黏聚力
Key words:rock-soil mixture material,dynamic compaction,in-situ direct shear test,the shear cohesion,original cohesion,stabilized cohesion
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