可测正负压下土体压缩性的真空固结仪研究与试验  

Research and Experiment on Vacuum Consolidator for Measuring Soil Compressibility Under Positive and Negative Pressure

作　　者：谢明所 XIE Mingsuo(China Railway 16th Bureau Group Electrification Engineering Co.Ltd.,Beijing 100018,China)

机构地区：[1]中铁十六局集团电气化工程有限公司,北京100018

出　　处：《铁道建筑技术》2024年第7期45-48,53,共5页Railway Construction Technology

基　　金：中铁十六局集团有限公司科技研究开发计划项目(K2022-21B)。

摘　　要：传统的一维固结仪只能对土体施加正压力,而无法研究负压作用下土体的次固结特性,且目前已有研究中无法实现正负压联合施加。本文对常规一维固结仪进行了改造,研发出一种可测正负压下土体压缩性的真空固结仪,即通过采用橡胶膜与密封盖、密封底座形成密封环境,再用橡胶箍筋将膜勒紧,确保密闭性。通过仪器的标定和负压密闭性试验,验证了研发的真空固结仪所得数据的准确性,可用于研究真空-堆载联合预压法下软土的次固结特性,为相关的研究提供有效的设备保障。The conventional one⁃dimensional consolidator is limited in its ability to apply positive pressure to the soil,and is unable to study the secondary consolidation characteristics of the soil under negative pressure.Furthermore,the joint application of positive and negative pressure is not currently feasible within the scope of existing research.In this paper,the conventional one⁃dimensional consolidator is modified to develop a vacuum consolidation instrument that can measure the compressibility of soil under positive and negative pressure.This is achieved by forming a hermetic environment with a sealing cover and a sealing base using a rubber membrane,which is then tightened with a rubber band to ensure the airtightness.The accuracy of the data obtained from the vacuum consolidation instrument is verified through calibration and a negative pressure confinement test.This enables the study of secondary consolidation characteristics of soft soil under the vacuum combined surcharge preloading,which is an effective equipment support for related research.

关 键 词：真空固结仪 一维固结仪 正负压联合 仪器标定 

分 类 号：TU41[建筑科学—岩土工程]