高地应力V级围岩相似材料研制及岩体开挖卸载模型试验分析  

Development of Similar Materials and Model Test Analysis of Rock Excavation and Unloading for the Surrounding Grade-V Rock under High Geostress

作　　者：方智淳 朱正国 王仁远 刘柳 FANG Zhichun;ZHU Zhengguo;WANG Renyuan;LIU Liu(Schoolof Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China;Hebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mines, Shijiazhuang 050043, Hebei, 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 [2]河北省金属矿山安全高效开采技术创新中心,河北石家庄050043

出　　处：《地震工程学报》2020年第2期505-511,共7页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(51978424);河北省高校百名创新人才支持计划(Ⅲ)(SLRC2017054);河北省人才工程培养经费资助项目(A201802005)。

摘　　要：以黄土、砂为骨料,石膏、水泥为胶结材料,水为调节剂,以正交试验方法配制出V级围岩相似材料,该材料能够很好的模拟隧道Ⅴ级软弱围岩。在此基础上,以钢筒模型试验为媒介,通过千斤顶配合反力架加载,观察不同材料配比下的试验组应力变化斜率、自稳时间、应变大小等方面的差异,结合加载完成后模型开口处岩体变化情况,探索高地应力下Ⅴ级围岩开挖卸载效应。试验结果表明:虽然相似材料会因配比不同改变物理力学性质,但主要是对弹性模量的影响较大;在增大垂直压力作用下,试验中材料自稳时间变长,应力释放也较为彻底,但整体趋势放缓。The model test can quantitatively and qualitatively reflect the variation law of physical parameters based on simplified ontology.Herein,loess and sand are considered to be the aggregates,gypsum and cement are considered to be the cementing material,water is considered to be the regulator,and the orthogonal test method is used to prepare a material similar to the surrounding grade-V soft rock.The physical and mechanical parameters of the material can satisfy the requirements and appropriately simulate the surrounding grade-V soft rock of a tunnel.On this basis,the steel cylinder model test is used to observe differences with respect to the stress-varying slope,self-stabilization time,and strain of the test group under different material ratios.Further,the excavation and unloading effects of the surrounding grade-V rock are explored under a high geostress based on the variation of rock mass at the opening of the model after loading.The test results denote that different proportions of similar materials will cause variation of the physical and mechanical properties and that the elastic modulus exhibits considerable influence;furthermore,the self-stabilization time of the material increases,the stress release becomes considerably thorough,and the overall variation trend decelerates with an increase in vertical pressure.

关 键 词：铁路隧道 模型试验 相似材料 卸载效应 

分 类 号：U455[建筑科学—桥梁与隧道工程]