土体含水量对西安黄土区土钉支护稳定性的影响  

Analysis on the impact of water content on the stability of soil nailing in Xi'an loess region

作　　者：张宏刚[1,2] 张卫东 

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710077 [2]西安理工大学,陕西西安710048

出　　处：《煤田地质与勘探》2015年第5期65-68,共4页Coal Geology & Exploration

基　　金：中煤科工集团西安研究院有限公司科技创新基金项目(2012XAYCX020);中煤科工集团西安研究院有限公司科技创新基金青年基金项目(2014QN015)

摘　　要：土体含水量是影响黄土区工程稳定性的关键因素之一。为建立土体含水量与土钉支护稳定性的关系,通过三轴压缩试验探讨当含水量变化时,西安黄土强度指标c、φ的变化规律,并讨论了土体强度衰减与含水量的关系。采用极限平衡理论分析探讨了土体含水量变化对土钉支护失效模式的影响以及稳定性变化规律,提出土钉支护3种失效模式出现次序与含水量有关且各失效模式对水分敏感程度存在差异性,认为当基坑土体含水量达到约23.5%时,土钉支护可能开始破坏。The change of water content is one of the key factors affecting the stability of loess engineering.In order to establish the relationship between the water content and the stability of soil nailing, through triaxial compression test the paper investigated the variation of loess strength index c and φ when the water content changed, discussed the relationship between the soil strength attenuation and water content. Analysis and discussion were conducted for the influence of water content on the failure mode of soil nailing support and the variation of stability by using the theory of limit equilibrium, it was put forward that the occurrence sequence of 3 failure modes of soil nailing support was related to the water content and the sensibility of different failure modes to the moisture was different. It was considered that when the water content of the foundation pit soil is about 23.5%, the soil nailing support may start to destroy.

关 键 词：含水量 强度衰减 失效模式 土钉支护 

分 类 号：TU4[建筑科学—土工工程]