基于三维扫描和三维雕刻技术的岩石结构面原状重构方法及其力学特性  

A new method to originally reproduce rock structural plane by integrating 3D scanning and 3D carving techniques and mechanical characteristics of reproduced structural planes

作　　者：周辉[1,2] 程广坦 朱勇 卢景景[1,2] 陈珺 崔国建[1,2] 李振国 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,湖北武汉430071 [2]中国科学院大学,北京100049 [3]兖州煤业股份有限公司东滩煤矿,山东济宁273512

出　　处：《岩土力学》2018年第2期417-425,共9页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划(973)项目(No.2014CB046902);国家自然科学基金项目(No.51427803;No.51404240;No.51709257)~~

摘　　要：为了客观重复制作与原岩结构面的岩性、表面形态和力学性质完全一致的试样,集成三维扫描和三维雕刻技术,提出了原岩结构面试样重构新方法。采用该方法制作了具有相同表面形态的大理岩结构面试样,开展了不同法向力下的直剪试验,并采用声发射技术对结构面剪切破坏过程进行了监测。结果表明:重构结构面试样与原始结构面试样具有高度相似性;结构面剪应力-剪切位移曲线可分为两类:剪胀滑移型和剪断跌落型;剪切破坏后结构面可明显地划分为两个区域:剪胀脱开区和剪断磨损区;提出了结构面剪切强度新公式,理论公式与试验结果更接近;结构面剪切过程中剪应力、能量率、计数、撞击率随时间的变化规律具有较好的一致性,声发射定位位置与剪切过程中结构面损伤破坏区域基本吻合。To prepare samples with the same lithology, surface morphology and mechanical characteristics as those of natural rock structural planes, a new method was proposed to originally reproduce rock structural planes by integrating 3D scanning and 3D carving techniques. Marble structural plane samples with the same natural surface shape were made using this new method. Shear tests were carried out on the prepared samples at different normal stresses. In addition, the acoustic emission （AE） technique was used to monitor failure processes of marble structural planes. The results indicate that the reproduced samples are accurately similar to the original samples with natural structural plane. The curves of shear stress and shear displacement can be divided into sliding type and cutting type. The shear failure structural plane can be categorised into dilatancy zone and abrasion zone. A new formula of shear strength is put forward, and theoretical values are in good agreement with experimental results. The change laws of shear stress and AE energy rate, count and hit with time are consistent, and the location of AE events is similar to the asperity damage positions during the shear test.

关 键 词：三维扫描 三维雕刻 原岩结构面原状重构方法 直剪试验 强度特性 剪胀特征 声发射 

分 类 号：TU452[建筑科学—岩土工程]