堆石体现场振动压实试验研究与应用  

Field vibration compaction test of rockfill and its application

作　　者：朱晟 卢知是[1,2] 刘纯 王京 ZHU Sheng;LU Zhi-shi;LIU Chun;WANG Jing(State Key Laboratory of Hydrology,Water Resources and Hydraulic Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Institute of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Power China Zhongnan Engineering Corporation Limited,Changsha,Hunan 410014,China)

机构地区：[1]河海大学水文水资源与水利水电工程科学国家重点实验室,江苏南京210098 [2]河海大学水利水电学院,江苏南京210098 [3]中国电建中南勘测设计研究院有限公司,湖南长沙410014

出　　处：《岩土力学》2021年第9期2569-2577,共9页Rock and Soil Mechanics

基　　金：国家重点研发计划(No.2017YFC0404801)。

摘　　要：采用基于动土压力盒(earth pressure cells,简称EPCs)、线位移传感器(linear variable differential transformers,简称LVDTs)等的动力测试技术,结合原位振动碾压试验,研究了压实过程中堆石体内部的应力变形特性和能量输入机制,并确定了碾压堆石料的最大干密度。结果表明:(1)碾压试验深度范围内堆石体的实测附加峰值应力在0.3~1.4 MPa之间,其中动应力峰值在0.22~0.82 MPa之间,且沿层深表现为指数衰减规律。(2)实测动应变明显滞后于动应力,且随着碾压遍数的增加,滞回圈变陡变小,土体刚度增大、阻尼减小。(3)采用频谱分析方法得到试验堆石体的激振应力分量、静线压力分量和变形,建立振动碾输入堆石体能量与检测干密度之间的关系,求得堆石体的最大干密度以及在不同碾压遍数下的相对密度,可为堆石坝填筑采用相对密度指标进行质量控制提供依据。Based on dynamic testing technology applying(earth pressure cells, EPCs) and(linear variable differential transformers, LVDTs), combining with the field vibration compaction tests, the internal stress and deformation characteristics and energy input mechanism of rockfill were studied. In the process of compaction, the maximum dry density of rockfill was determined. The results showed that: 1) The additional peak stress of rockfill in the depth range was between 0.3-1.4 MPa. The dynamic peak stress was between 0.22-0.82 MPa, which decayed exponentially along with the increasing of the depth of rockfill. 2) The measured dynamic strain significantly lagged behind the dynamic stress. With the increase of rolling times, the hysteretic cycle became steeper and smaller, while the soil stiffness increased and the damping decreased. 3) Dynamic stress, static stress and deformation were obtained through spectrum analysis and filtering methods, based on which the relationship between the input energy of the vibratory roller and the measured dry density was established. Then, the maximum dry density of rockfill and its relative density under different rolling times were calculated. This method can provide a basis for quality control of rockfill dam using the relative density index.

关 键 词：堆石坝 振动压实 应力变形 滤波 相对密度 

分 类 号：TV641.4[水利工程—水利水电工程]