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

作　　者：陈剑锋 徐保林 钟佩 班明才 朱双云 CHEN Jianfeng;XU Baolin;ZHONG Pei;BAN Mingcai;ZHU Shuangyun(Zhongnan Survey Foundation Engineering Co.,Ltd.,Wuhan 430081,China)

机构地区：[1]中南勘察基础工程有限公司,武汉430081

出　　处：《粉煤灰综合利用》2025年第1期55-59,共5页Fly Ash Comprehensive Utilization

摘　　要：为探讨砂岩夹杂膨胀泥岩互层结构变形规律及对路基的影响,对平层、斜层、竖层三种重塑砂岩与泥岩膨胀岩互层产状结构在不同层厚比、不同上覆荷载进行了室内模型试验和有限元模拟分析。结果表明:产状、层厚比和上覆荷载对于互层结构膨胀岩变形的影响均较大,层厚比和上覆荷载越大,变形量越小,平层产状影响最大,竖层产状影响最小,斜层产状影响居中;当互层结构膨胀力大于上覆荷载时,岩样处于膨胀变形,当互层结构膨胀力小于上覆荷载时,岩样处于压缩变形;平层产状在1∶1、2∶1层厚比时,膨胀力介于12.5~25 kPa之间,其余情况均小于12.5 kPa;在最不利工况下,平层、斜层、竖层三种互层结构对路基膨胀变形的影响长度分别为60、30、20 m。In order to explore the deformation law of sandstone interbedded with expansive mudstone and its influence on roadbed,indoor model tests and finite element simulation analysis were conducted on the interbedded structure of reshaped sandstone and expansive mudstone in three different layers:flat layer,inclined layer,and vertical layer,under different layer thickness ratios and overlying loads.The results show that the attitude,layer thickness ratio,and overlying load have a significant impact on the deformation of interlayer structured expansive rocks.The larger the layer thickness ratio and overlying load,the smaller the deformation.The influence of the flat layer attitude is the greatest,the vertical layer attitude is the smallest,and the inclined layer attitude is in the middle;When the expansion force of the interlayer structure is greater than the overlying load,the rock sample is in expansion deformation.When the expansion force of the interlayer structure is less than the 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,the lengths of the influence of the three layered structures of flat,inclined,and vertical layers on the expansion deformation of the roadbed are 60 m,30 m,and 20 m,respectively.

关 键 词：砂岩 膨胀泥岩 层厚比 产状 上覆荷载 膨胀力 膨胀变形 

分 类 号：U213.1[交通运输工程—道路与铁道工程]