砂質泥巖互層結構重塑弱膨脹巖變形試驗研究

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

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中圖分類號：U213.1 文獻標志碼：A 文章編號：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

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0 引言

膨脹巖具有吸水膨脹和失水收縮的特性，反復的膨脹和收縮變形會引發(fā)許多工程地質問題，如路面、路堤、路塹病害等，路面病害主要集中在路面橫向波浪變形、濺泥等問題，路堤病害主要集中在坍塌、滑坡等問題，路塹病害主要集中在侵蝕、剝落、滑坡、溜塌等問題[1-4]。（剩余9087字）