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	风积沙地基金属装配式基础的真型试验研究
其他题名	Full-scale tests of steel grillage foundation in aeolian sand areas
	冯衡; 高斐略; 刘观仕; 高彬; 肖飞; 曾二贤
来源期刊	岩土力学
ISSN	1000-7598
出版年	2021
卷号	42 期号:12 页码:3328-3334
中文摘要	越来越多输电线路穿过风积沙覆盖的沙漠地区,金属装配式基础具有良好的适用性,但目前现场试验研究甚少。在毛乌素沙地南缘的陕西榆林地区,开展多组风积沙地基金属装配式基础的真型上拔试验,测试与分析基础的上拔承载力、上拔与地表位移、支架与底板应力、上部土压力等参数变化。研究结果表明:金属装配式基础的上拔荷载-位移曲线形态与扩展基础类似,可分为近似直线段、塑性过渡段和直线失稳段;上拔累计竖向位移达到21~23 mm时,基础进入极限状态;加载过程中基础顶部周围地表若出现细小裂缝,并沿对角线方向扩展,则基础在下一级荷载下进入极限状态;通过分析基础上部土压力的变化特征,可发现基础上拔破裂面上的破裂点,据此推算出实际上拔角;现有规范中土重法计算的上拔承载力,相较极限上拔承载力试验值偏大,建议相关地区基础设计时上拔角取为19.0°~19.5°。
英文摘要	More and more transmission lines pass through the desert area covered by aeolian sand, and steel grillage foundation has good applicability, but there are few field tests at present. In Yulin area of Shaanxi Province, southern edge of Maowusu sandy land, several groups of full-scale uplift tests of steel grillage foundation in aeolian sand ground were carried out, and the uplift bearing capacity, uplift and surface displacement, support and floor stress, upper earth pressure and other parameters were tested and analyzed. The results show that the uplift load-displacement curve of the steel grilage foundation is similar to that of the spread foundation, which can be divided into the approximate straight section, plastic transition section and linear instability section. When the cumulative uplift displacement reaches 21-23 mm, the foundation comes to the limit state. If small cracks appear on the ground surface around the top of the foundation during loading and propagate along the diagonal direction, the foundation will enter the limit state under the next level load. By analyzing the variation characteristics of the earth pressure on the upper part of the foundation, the fracture point on the uplift fracture surface of the foundation can be found, and the actual uplift angle can be calculated. The uplift bearing capacity calculated by the soil weight method in the existing codes is larger than the test value of ultimate uplift bearing capacity. It is suggested that the uplift angle should be 19.0° to 19.5° in the foundation design of relevant areas.
中文关键词	风积沙 ; 金属装配式基础 ; 真型试验 ; 上拔 ; 极限承载力
英文关键词	aeolian sand steel grillage foundation full-scale test uplift ultimate bearing capacity
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Construction & Building Technology
CSCD记录号	CSCD:7119732
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/378011
作者单位	冯衡, 中国电力工程顾问集团中南电力设计院有限公司, 武汉, 湖北 430071, 中国.; 高斐略, 中国电力工程顾问集团中南电力设计院有限公司, 武汉, 湖北 430071, 中国.; 高彬, 中国电力工程顾问集团中南电力设计院有限公司, 武汉, 湖北 430071, 中国.; 曾二贤, 中国电力工程顾问集团中南电力设计院有限公司, 武汉, 湖北 430071, 中国.; 刘观仕, 中国科学院武汉岩土力学研究所, 岩土力学与工程国家重点实验室, 武汉, 湖北 430071, 中国.; 肖飞, 中国科学院武汉岩土力学研究所, 岩土力学与工程国家重点实验室, 武汉, 湖北 430071, 中国.
推荐引用方式 GB/T 7714	冯衡,高斐略,刘观仕,等. 风积沙地基金属装配式基础的真型试验研究[J],2021,42(12):3328-3334.
APA	冯衡,高斐略,刘观仕,高彬,肖飞,&曾二贤.(2021).风积沙地基金属装配式基础的真型试验研究.岩土力学,42(12),3328-3334.
MLA	冯衡,et al."风积沙地基金属装配式基础的真型试验研究".岩土力学 42.12(2021):3328-3334.