基于隧道离心试验的柔性软接触土压计测试可靠性评价  

Reliability evaluation of flexibly soft contact earth pressure cell testing based on centrifugal tests on tunnels

作　　者：刘远鹏 汤兆光 李雨润 王永志[1,2] 朱耀庭 刘红帅[5] LIU Yuanpeng;TANG Zhaoguang;LI Yurun;WANG Yongzhi;ZHU Yaoting;LIU Hongshuai(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China;College of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;CCCC Tianjin Port Engineering Institute Co.,Ltd.,Tianjin 300222,China;Institute of Geotechnical Engineering,Hebei University,Baoding 071002,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080 [3]河北工业大学土木与交通学院,天津300401 [4]中交天津港湾工程研究院有限公司,天津300222 [5]河北大学岩土工程研究所,河北保定071002

出　　处：《岩土工程学报》2024年第S01期75-80,共6页Chinese Journal of Geotechnical Engineering

基　　金：中国地震局工程力学研究所基本科研业务费专项项目(2023B08);黑龙江省自然科学基金项目(LH2023E019)。

摘　　要：开展一系列离心模型试验,选取线性误差、平均幅值误差、响应速率作为指标,基于隧道模型对柔性软接触新型土压计ESP-II和两种国际代表性传统土压传感器(PDA、EPL-D1)进行对比评价,验证新研发土压力计测量的可靠性。主要结论如下:①静力状态下,ESP-II、PDA、EPL-D1线性误差分别为19.36%,12.7%,21.0%,平均幅值误差为5.79%,48.2%,22.6%,证明ESP-II土压力计相比国际两种土压计具有较好静力测试性能。②动力荷载下,ESP-II、PDA、EPL-D1土压力计的平均响应速率分别为67.1,51.5,65.8 Hz,ESP-II的响应速率略高于其他两种土压力计,具有良好的响应频率;序列地震动荷载下ESP-II、PDA测得土压力与EPL-D1不同,呈现一致增量规律,而数值存在一定差异,反映土体具有较强结构性。③卸载过程中,3种土压力计测得数据均呈现不同程度的非线性变化特征,PDA和EPL-D1土压力时程曲线产生了偏折、跳变现象,而ESP-II土压力时程曲线保持了较好数据连续性,一定程度说明软接触式设计能实现土压力计与土体的良好接触。A series of centrifugal model tests are conducted by selecting the linear error,average amplitude error and response rate as the indice.Based on the tunnel model,a new flexibly soft contact earth pressure cell ESP-II and two internationally representative traditional earth pressure sensors(PDA and EPL-D1)are compared and evaluated to verify the reliability of the newly developed earth pressure cell measurement.The main conclusions are as follows:(1)Under the static state,the linear errors of ESP-II,PDA and EPL-D1 are 19.36%,12.7%and 21.0%,respectively,and the average amplitude errors are 5.79%,48.2%and 22.6%,indicating that the ESP-II earth pressure cell has better static testing performance compared to the two international earth pressure cells.(2)Under the dynamic loads,the average response rates of ESP-II,PDA and EPL-D1 earth pressure cells are 67.1,51.5,and 65.8 Hz,respectively.The response rate of ESP-II is slightly higher than that of the other two types of earth pressure cells,indicating a good response frequency.The earth pressures measured by ESP-II and PDA under sequential seismic loads are different from those of EPL-D1,showing a consistent incremental pattern.However,there are certain differences in the numerical values,indicating that the soils have strong structural characteristics.(3)During the unloading process,the data measured by the three types of earth pressure cell show varying degrees of nonlinear changes.The time-history curves of earth pressures of PDA and EPL-D1 exhibit bending and jumping phenomena,while those of ESP-II maintain good data continuity,indicating to some extent that the soft contact design can achieve good contact between the earth pressure cells and the soils.

关 键 词：隧道 离心模型试验 软接触式 土压力计 测试可靠性 

分 类 号：TU453[建筑科学—岩土工程]