摘要
基坑施工中使用不同长度或布置方式的锚索对基坑边坡的支护效果有较大不同,选用更为经济合理的优化支护方案是保证城市土体深基坑工程顺利进行的重要条件。文章采用有限差分计算软件FLAC3D,对大连市一基坑开挖时使用不同长度锚索支护情况下边坡特征点位移以及安全系数进行计算分析,优化了支护方案,并在实际工程中与其他方案进行对比,研究不同锚索长度对城市土体基坑边坡支护效果的影响。结果表明:过长的锚索会扰动和破坏深部土体的原始应力分布,从而降低锚索的支护效果;在易产生滑移的基坑上部位置选用较长的锚索,基坑中部位置选用中等长度锚索,基坑底部边坡使用较短锚索,采用这种优化方式支护安全系数为1.64,较其他方案有所增加,基坑边坡安全性有所提高。
Different length or arrangement of anchor cables are used in foundation pit construction to support the slope of function pit, which can come with different affection. It is an important condition to select more economical and reasonable optimum supporting scheme to ensure the smooth process of urban deep foundation pit engineering. In this paper, the finite difference calculation software FLAC3D is used to calculate and analyze the displacement of slope characteristic points and safety factor of a foundation pit slope supported by different length anchor cables during excavation in Dalian City. By optimizing the support scheme and comparing it with the actual project, the effect of different length of anchor cables on the slope support effect of urban soil foundation pit is studied. The results show that excessive length of anchor cable disturbs and destroys the original stress distribution of deep soil, thus, reducing the supporting effect of anchor cable. Longer anchor cable is selected at the upper part of foundation pit, middle length anchor cable is selected at the middle part of the foundation pit, and shorter anchor cable is selected at the bottom slope of foundation pit. The safety factor of this optimized support method is 1.64, which increases compared with other schemes. The safety of foundation pit slope has been improved.
作者
王知深
李勇
朱维申
董振兴
WANG Zhishen;LI Yong;ZHU Weishen(Geotechnical & Structural Engineering Research Center, Shandong University, Jinan 250061, China;School of Civil Engineering, Shandong University, Jinan 250061, China)
出处
《山东建筑大学学报》
2019年第1期84-89,共6页
Journal of Shandong Jianzhu University
基金
国家科技支撑计划项目(2015BAB07B05)
国家自然科学基金项目(51379112)
关键词
基坑开挖
边坡支护
锚索长度
数值模拟
foundation pit excavation
slope support
anchor cable length
numerical simulation
