坝基深厚覆盖层粗粒土原位密度与力学特性研究  

Study on insitu densities and mechanical properties of coarse granular soils in deep overburden layers of dam foundation

作　　者：李向阳[1] 左永振[2] 周跃峰[2] 陈晴[1] LI Xiangyang;ZUO Yongzhen;ZHOU Yuefeng;CHEN Qing(PowerChina Beijing Engineering Corporation Limited,Beijing 100024,China;Key Laboratory of Geotechnical Mechanics and Engineering,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]中国电建集团北京勘测设计研究院有限公司,北京100024 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《人民长江》2021年第7期180-184,191,共6页Yangtze River

基　　金：中央公益性科研院所基本科研业务费项目(CKSF20191821YT);国家自然科学基金项目(51979010)。

摘　　要：针对覆盖层粗粒料的原位物理特性难以确定的技术难题,采用室内旁压试验与大型三轴试验相结合的方法,对金沙江苏洼龙水电站坝基深厚覆盖层③层和⑤层粗粒土进行了原位密度与力学特性的试验研究。依据现场旁压模量,采用同源粗粒土进行不同密度的室内旁压模型试验,建立旁压模量与密度的关系曲线,推求了覆盖层③层和⑤层的原位密度。依照上述密度,开展了覆盖层③层和⑤层的常规大型三轴试验,得到了相应的抗剪强度指标和变形参数指标。研究成果可为苏洼龙水电站高土石坝安全分析和变形协调控制提供依据。It is difficult to determine the in-situ physical properties of overburden coarse particles.In this study,the insitu densities and mechanical properties of coarse granular soils in the 3rd and the 5th deep overburden layers of dam foundation of the Suwalong Hydropower Station on the Jingsha River were investigated based on pressure meter model tests and large-scale triaxial tests.Firstly,according to insitu side modulus,we carried out pressure meter model tests in laboratory using two coarse granular soils with different densities from the same source,obtaining curves between pressure meter modulus and density,and further deducing the insitu densities of the 3rd and the 5th deep overburden layers.Based on the predicted densities of the two coarse granular soils,we carried out large-scale traxial tests in laboratory to obtain the strength and deformation parameters of the 3rd and the 5th deep overburden layers.The results can support dam safety analysis and deformation management of dam body.

关 键 词：粗粒土 深厚覆盖层 原位密度 旁压试验 大型三轴试验 苏洼龙水电站 

分 类 号：TU47[建筑科学—结构工程]