吹填礁砂层状地基水平推剪试验研究  

Experimental study onhorizontal push-shear test of layered foundations of hydraulic fill reef sand

作　　者：刘特 雷学文[1] 孟庆山[2] LIU Te;LEI Xuewen;MENG Qingshan(City Construction Institute,Wuhan University of Science and Technology,Wuhan 430065,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《人民长江》2020年第9期183-188,共6页Yangtze River

基　　金：国家自然科学基金面上项目(4187071837)。

摘　　要：为了研究吹填礁砂层状地基细砂层、砾砂层的剪切强度以及砂砾分层交界处滑动面的特性,在模拟的吹填礁砂试验坑开展大型推剪试验,得到层状地基在不同条件下的滑动破裂面、抗剪强度及推剪变形曲线。试验结果表明:相对密实度越高,礁砂层状地基抗剪强度越高;细砂层和砾砂层相对密实度相同时,细砂层的抗剪强度比砾砂层的抗剪强度高;砂、砾分层试样推剪后表现出滑裂面在砾砂层中较陡,在细砂层中较缓,且在砂砾分层交界处出现拐点的现象。试验成果可为吹填岛礁地基上的工程基础设计提供一定的参考。In order to study the shear strength of the fine sand layer and the gravel layer of the reef sand layer,and the characteristics of the sliding surface at the sand-gravel layer boundary,a large-scale push-shear test was carried out for a model of reef sand test pit.The sliding rupture surface,shear strength and shear deformation curve of the foundation under different conditions were obtained.The test results show that the higher the relative compactness,the higher the shear strength of the reef sand layered foundation.When the relative density of the fine sand layer and the gravel layer are the same,the shear strength of the fine sand layer is higher than that of the gravel layer.For the sand and gravel layered foundation,the slip surface is steeper in the gravel layer and gentle in the fine sand layer,and an inflection point occurs at the sand and gravel layer boundary.This test can provide reference for the foundation design of hydraulic-filled reef.

关 键 词：吹填礁砂 层状地基 推剪试验 抗剪强度 

分 类 号：TU411[建筑科学—岩土工程]