基于正交设计的泥岩膨胀试验及其影响因素研究  

Mudstone Swelling Test and its Influencing Factors Based on Orthogonal Design

作　　者：万伟 崔宏环[1,2] 尹文峰 王雅超 WAN Wei;CUI Honghuan;YIN Wenfeng;WANG Yachao(Hebei University of Architecture,Zhangjiakou 075000,China;Hebei Prefabricated Construction and Underground Engineering Technology Innovation Center,Zhangjiakou 075000,China)

机构地区：[1]河北建筑工程学院,河北张家口075000 [2]河北省装配式建造与地下工程技术创新中心,河北张家口075000

出　　处：《森林工程》2024年第5期172-180,共9页Forest Engineering

基　　金：河北省教育厅科学研究项目(CXY2024002)。

摘　　要：以正交试验设计方法为基础,对张家口市京新高速公路路堑膨胀性泥岩开展试验,重点研究不同上覆荷载下泥岩试样的膨胀率与浸水时间、初始含水率、压实度的规律关系,并采用极差分析法对各种因素进行敏感性分析。研究结果表明,膨胀率随浸水时间的变化曲线呈现出S形走势,大致可划分为初始膨胀阶段、加速膨胀阶段、缓慢膨胀阶段;在相同初始含水率条件下,膨胀率随着压实度的增大而增大;在相同的压实度条件下,膨胀率随初始含水率增大而减小。通过极差分析法可知,试样浸水时间为影响膨胀率的主导因素,含水率和压实度为次要影响因素,且小荷载下含水率对试样膨胀率的影响比较明显,荷载继续增大,压实度超过含水率对试样膨胀率的影响。Based on the orthogonal test design method,the expansive mudstone in the cutting of Jingxin expressway in Zhangjiakou city was tested,and the relationship between the expansion rate of mudstone samples under different overlying loads and the soaking time,initial water content and compaction degree was studied,and the sensitivity of various factors was analyzed by the range analysis method.The results showed that the curve of expansion rate with the soaking time presented an S-shaped trend,which can be roughly divided into initial expansion stage,accelerated expansion stage and slow expansion stage.Under the same initial water content,the expansion rate increased with the increase of the compaction degree.Under the same compaction degree,the expansion rate decreased with the increase of initial water content.The range analysis method showed that the soaking time of the sample was the main factor affecting the expansion rate.Water content and compaction degree were the secondary influencing factors,and the influence of water content on the sample expansion rate was obvious under small load,and the load continued to increase,the compaction degree exceeded the influence of water content on the sample expansion rate.

关 键 词：泥岩 膨胀变形 膨胀率 正交试验 极差分析法 

分 类 号：TU41[建筑科学—岩土工程]