膨胀性泥岩膨胀性试验研究  

Experimental Study on Swelling Characteristics of Expansive Mudstone

作　　者：王晨 郭小龙 WANG Chen;GUO Xiaolong(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《国防交通工程与技术》2023年第1期37-40,共4页Traffic Engineering and Technology for National Defence

摘　　要：结合隧道工程探讨膨胀性泥岩的膨胀特性,试验材料取自隧道施工现场的白垩系泥岩和第三系泥岩。通过对取芯机进行改造采用干法取样,采用通高压风代替通水的方法进行冷却,避免岩土含水率变化和卡钻等问题,测试泥岩在不同情况下的膨胀率及膨胀压力。研究表明:白垩系泥岩和第三系泥岩的矿物成分基本一致;白垩系泥岩和第三系泥岩泥岩的膨胀率为1.5%~3.0%、1.0%~2.0%,白垩系泥岩较第三系泥岩的吸水性高,整体来讲两种岩石膨胀性较低,吸水性较弱;白垩系泥岩和第三系泥岩两种泥岩膨胀力在浸水前期快速增长,最终膨胀力平均值达231.6 kPa、250.8 kPa。为膨胀性泥岩隧道变形破坏机理和控制技术研究提供基础。The swelling characteristics of expansive mudstone are discussed in the context of tunneling project. The tests usecretaceous mudstone and tertiary mudstone taken from the tunnel construction site. The swelling rate and pressure of the mudstone under different conditions are tested through modifying the coring machine to adopt the dry sampling method and adopting the method of cooling by passing high pressure air instead of water which could avoid the problems of water content of the rock and soil and stuck rotation. The study shows that the mineral composition of cretaceous mudstone and tertiary mudstone is almost the same;the swelling rate of cretaceous mudstone and tertiary mudstone is 1.5%~3.0% and 1.0%~2.0%, respectively.The water absorption of cretaceous mudstone is higher than that of tertiary mudstone. Generally, the expansibility of both rocks is lower and the water absorption is weaker;the swelling force of both mudstones grows rapidly in the early stage of water immersion, and the average value of the final swelling force reaches 231.6 kPa and 250.8 kPa, respectively. It provides a basis for the research and development of deformation failure mechanism and deformation control technology of expansive mudstone tunnel.

关 键 词：白垩系泥岩 第三系泥岩 矿物成分 膨胀率 膨胀力 

分 类 号：U452.12[建筑科学—桥梁与隧道工程]