砂质泥岩互层结构重塑弱膨胀岩变形试验研究

Experimental Study on the Deformation of Weakly Expansive Rocks by Reshaping the Interlayered Structure of Sandy Mudstone

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中图分类号：U213.1 文献标志码：A 文章编号：1005-8249（2025）01-0055-05

DOI：10.19860/j.cnki.issn1005-8249.2025.01.011

CHEN Jianfeng，XU Baolin， ZHONG Pei， BAN Mingcai， ZHU Shuangyun( Zhongnan Survey Foundation Engineering Co.，Ltd.，Wuhan 43OO81，China）

Abstract：Inorder toexplorethedeformationlawofsandstoneinterbeddedwithexpansivemudstoneanditsinfluenceon roadbed，indoormodeltestsandfiniteelementsimulationanalysiswereconductedontheinterbeddedstructureofreshaped sandstoneandexpansivemudstoneinthreediferentlayers：flatlayer，inclinedlayer，andverticallayer，underdierentlayer thicknessratiosandoverlying loads.Theresultsshowthattheatitude，layer thicknessratio，andoverlying load havea significantimpactonthedeformationof interlayerstructuredexpansiverocks.Thelargerthelayerthicknessratioandoverlying load，thesmalerthedeformation.Theinfluenceoftheflatlayeratitudeisthegreatest，theverticallayeratitudeisthe smallest，andtheinclinedlayeratitudeisinthemiddle；Whentheexpansionforceofteinterlayerstructureisgreaterthnthe overlyingload，therocksampleisinexpansiondeformation.Whentheexpansionforceoftheinterlaerstructureislsthanthe overlying load，the rock sample is in compression deformation；When the layer thickness ratio is 1：1 or 2：1 ，the expansion force ranges from 12.5 to 25 kPa ，while in other cases it is less than 12.5 kPa ；Under the most unfavorable working conditions， thelengthsoftheinfluenceoftethreelayeredstructuresofflat，inclined，ndverticallayersontheexpansiondeforationof the roadbed are 60 m ， 30 m ，and 20 m ，respectively.

Key words：sandstone；expansive mudstone；layer thicknessratio；atitude；overburden load；expansion force；expansion deformation

岩土力学

0 引言

膨胀岩具有吸水膨胀和失水收缩的特性，反复的膨胀和收缩变形会引发许多工程地质问题，如路面、路堤、路堑病害等，路面病害主要集中在路面横向波浪变形、溅泥等问题，路堤病害主要集中在坍塌、滑坡等问题，路堑病害主要集中在侵蚀、剥落、滑坡、溜塌等问题[1-4]。（剩余9087字）