考虑含石量的冰碛体围岩剪切特性及分级研究  

Study on Shear Characteristics and Classifications of Moraine Considering Gravel Content

作　　者：陈志敏[1] 刘宝莉 徐江涛 CHEN Zhimin;LIU Baoli;XU Jiangtao(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070)

机构地区：[1]兰州交通大学土木工程学院,兰州730070

出　　处：《现代隧道技术》2025年第1期38-47,共10页Modern Tunnelling Technology

基　　金：国家自然科学基金(12262018);中央引导地方科技发展资金(22ZY1QA005).

摘　　要：为了对冰碛体围岩进行更准确、更细致地分级,首先采用相似理论配置冰碛体相似材料,设计直剪试验研究了含石量对冰碛体力学特性的影响。其次引入含石量,基于熵权-可拓物元理论建立冰碛体围岩分级模型,将传统的Ⅳ、Ⅴ级冰碛体围岩细化为MⅠ~MⅤ五级。最后选取9个断面,采用建立的方法进行围岩分级,并与《铁路隧道设计规范》和BQ法分级结果进行对比。研究结果表明,含石量是影响冰碛体力学特性的重要因素,引入含石量的熵权-可拓物元理论冰碛体围岩分级模型不仅可以正确地确定围岩级别,也可以将传统的Ⅳ、Ⅴ级围岩细化为MⅠ~MⅤ五级,更有利于冰碛体围岩隧道支护结构及参数的选取,此方法也为类似特殊隧道围岩分级提供了新思路。In order to more accurately and thoroughly classify the moraine,similar materials for moraine were pre-pared based on similarity theory,and direct shear tests were designed to study the influence of gravel content on the mechanical properties of moraine.Next,gravel content was introduced,and based on entropy-weight-extended mat-ter-element theory,a classification model for moraine was established,refining the traditional Ⅳ and Ⅴ-grade mo-raine into five grades,M_(Ⅰ)to M_(Ⅴ).Finally,nine sections were selected,and the results calculated using the entropy-weight-extended matter-element method were compared with the classfication results from the"Railway Tunnel De-sign Code"and the BQ method.The study shows that gravel content is an important factor affecting the mechanical properties of moraine.The results of the classification model incorporating gravel content based on entropy-weight-extended matter-element theory not only correctly determine the surrounding rock grade but also refine the traditional Ⅳ and Ⅴ-grade surrounding rock into five grades,M_(Ⅰ)to M_(Ⅴ).This is more conducive to the selection of tunnel sup-port structures and parameters for moraine surrounding rock,and the method provides a new approach for the classi-fication of similar special tunnel surrounding rocks.

关 键 词：冰碛体 含石量 抗剪强度 围岩分级 

分 类 号：TU452[建筑科学—岩土工程]