摘要
鉴于标准固结试验研究壁后注浆体固结特性的局限性,分析总结了现有固结装置的不足之处,设计发明的分段式有机玻璃柱-气压活塞式固结装置,能够实现20 cm的壁后注浆体厚度和不同地层排水条件的模拟;特制橡胶活塞能够有效解决组装过程中气体滞留问题,保证浆体各部分固结排水程度一致;加压系统最高可保证0.8 MPa固结压力的施加,压力精度达0.01 MPa;数据采集系统可以自动采集浆体及地层内的孔压消散情况,准确反应浆体的固结排水程度。改进的气压活塞式固结装置,不仅可以研究浆体固结排水及浆液扩散过程,还可以进行不同浆液与地层的匹配性、固结试样的无侧限抗压强度和弹性模量等力学参数的测试,实验结果可以为壁后注浆施工工艺的优化提供数据支撑。
Based on the limitation of the standard consolidation test when studying the consolidation characteristics of backfill grouting, the shortcomings of the existed consolidation devices are analyzed and summarized. The designed segmented plexiglass columu-air pressure piston type consolidation device can ensure the simulation of the different drainage conditions and the size of 20 cm backfill grouting;The modified rubber piston can effectively solve the problem of gas retention in the assembly process, so as to ensure that the consolidation and drainage degree of each part of the grouting is consistent;The pressure system can ensure the application of 0.8 MPa consolidation pressure, and the pressure accuracy can reach 0.01 MPa;The data acquisition system automatically collects the dissipation of pore pressure in grouting and formation, and accurately reflects the consolidation and drainage degree of the grouting. The improved consolidation test method can not only be used to study consolidation drainage and grouting diffusion process, but also can be used to study the matching between different grouting and formation, unconfined compressive strength and elastic modulus of consolidated specimen, so as to further guide the construction technology of backfill grouting.
作者
闵凡路
马佳伟
俞超杰
戴俊杰
戴叶谦
Min Fanlu;Ma Jiawei;Yu Chaojie;Dai Junjie;Dai Yeqian(Key Laboratory of Geomechanics and Embankment Engineering,Ministry of Education,Hohai University,Nanjing 210098,P.R.China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第4期1241-1249,共9页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金项目(52078189,51778213)
中央高校基本科研业务费专项资金(B200202073)。
关键词
盾构隧道
壁后注浆
固结试验
装置改进
shield tunnel
backfill grouting
consolidation test
device improvement
