隧道穿越岩堆体围岩剪切特性及分级  

Shear Characteristics and Classification of Surrounding Rock of Tunnel through Rock Pile

作　　者：陈志敏[1] 张赓旺 李宁[3] CHEN Zhi-min;ZHANG Geng-wang;LI Ning(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China;China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an 710043,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]中交第二公路勘察设计研究院有限公司,武汉430056 [3]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《科学技术与工程》2024年第20期8640-8647,共8页Science Technology and Engineering

基　　金：国家自然科学基金(12262018);甘肃省建设科技攻关基金(JK2018-33)。

摘　　要：为解决隧道穿越岩堆体围岩分级不准确的问题,通过相似材料直剪试验分析岩堆体的直剪特性,将含水率和填充土含量两个因素带入熵权可拓物元法,并结合地质指标进行分级研究。结果表明岩堆体的抗剪强度随着含水率、填充土含量的增大,先增大后减小,最终趋于平稳,过高或过低的含水率和填充土都会“弱化”岩堆体的抗剪强度。根据岩堆体的特点,选取岩石单轴饱和抗压强度、节理裂隙密度、岩体完整性系数、含水率和填充土含量作为分级指标,结合熵权可拓物元法,将所选指标和熵权可拓物元法结合并在工程实例进行验证,分级结果比原方法准确性更好,证明研究提出的围岩分级方法是合理可行的。研究结果能够为岩堆体隧道的围岩分级提供指导,为施工设计和支护方式提供依据。In order to solve the problem of inaccurate classification of surrounding rock of tunnel through rock pile,direct shear test of similar materials was used to analyze the direct shear characteristics of rock pile,and two factors of water content and soil content were used to the entropy weight extension matter element method,and the classification was studied in combination with geological indexes.The results show that with the increase of water content and soil content,the shear strength of rock pile first increases and then decreases,and finally becomes stable.Too high or too low water content and soil will“weaken”the shear strength of rock pile.According to the characteristics of rock pile,the rock uniaxial saturated compressive strength,joint crack density,rock integrity coefficient,water content and soil content were selected as classification indexes.Combined with the entropy weight extension matter element method,the selected indexes were combined with the entropy weight extension matter element method,and the classification results were verified in engineering examples.The accuracy of the classification results is better than that of the original method,which proves that the surrounding rock classification method proposed is reasonable and feasible.The research results can provide guidance for the grading of rock pile tunnel,and provide basis for construction design and support method.

关 键 词：隧道工程 围岩分级 熵权可拓物元 直剪试验 围岩稳定性 岩堆 

分 类 号：TU452[建筑科学—岩土工程]