风化岩地区土钉墙支护设计与施工若干问题探讨  

Discussions of Soil Nailing Wall Design and Construction in Weathered Rock Zones

作　　者：刘琦[1] 杜鹏祥 

机构地区：[1]辽宁省建筑设计研究院岩土工程公司,沈阳110005 [2]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《土工基础》2014年第5期63-65,共3页Soil Engineering and Foundation

摘　　要：结合工程经验与规范中的规定,说明岩体内摩擦角φk的确定方法,并利用单轴应力条件下的摩尔—库伦准则来反算岩体的粘聚力ck,利用该方法确定的岩体工程设计参数进行土钉墙支护方案的设计计算;通过工程实例说明风化岩地区钢管式土钉可打入深度与标准贯入试验锤击数之间的关系,为工程设计人员在确定钢管式土钉设计长度时提供参考;提出土钉墙支护在北方严寒地区应用时考虑到冻胀作用影响下应采取的措施。This paper presents the results of determination of the internal friction angle of the rock mass based on the project experience and the design code requirements.The cohesion of the rock mass is back analyzed by using the Mohr-Coulomb criterion under uniaxial stress.The design parameters of the rock mass are used in the soil nailing wall supporting design.The hollow soil nails’ penetration depth is correlated with the blow counts of the Standard Penetration Test.This empirical relationship provides a reference value for the design of the required length for the hollow soil nails.The paper also presents the engineering considerations for the soil nail applications in the cold regions that are affected by the freeze expansions.

关 键 词：风化岩 土钉墙 钢管土钉 冻胀作用 

分 类 号：TU472[建筑科学—结构工程]