土体龟裂研究方法

发布时间：2018-06-11 11:33

本文选题：龟裂 + 研究方法　；参考：《岩土力学》2017年S1期

【摘要】：土体龟裂是一种常见的自然现象,会对土体的工程性质产生显著的负面影响,是许多工程地质和环境地质问题的直接诱因,要研究龟裂,首先需要解决研究方法问题。基于国内外近些年围绕龟裂所开展的工作,着重对研究方法进行了系统的归纳和总结,对比分析了各种方法的优缺点,得到如下认识:(1)土体龟裂研究方法总体分为试验研究和数值模拟研究两大类,试验研究又可分为室内试验和现场试验,目前该课题主要以室内试验为主;(2)室内试验常用的试样主要有泥浆样和压实样两种,且前者更受学界欢迎;(3)土体龟裂试验主要涉及两方面的关键仪器设备,一方面是用于控制试验的环境条件,代表性的为环境箱,另一方面是用于监测龟裂发育过程的相关参数,尤其是裂隙几何形态参数,代表性的有图像采集装置、激光扫描仪、CT机、ERT和分布式光纤等;(4)在试验方法方面,多采用控制变量法研究一个或几个参数对土体龟裂形成及发育规律的影响,包括试样初始状态、尺寸大小、厚度、土质成分、环境温度、相对湿度、试样/容器接触条件和干湿循环次数等;(5)采用数字图像处理技术能快速提取龟裂网络的几何形态结构参数,较其他技术更具前景;(6)现场试验可以最大限度的反映真实裂隙的形成和发育规律,但由于这类试验费时费力投入大等客观原因,报道相对较少;(7)数值模拟是研究土体龟裂的重要手段之一,但由于现阶段关于龟裂发育机制没有统一认识,相关研究还处于起步阶段。最后,针对当前的研究不足提出了今后土体龟裂课题的研究重点。
[Abstract]:Soil cracking is a common natural phenomenon, which has a significant negative impact on the engineering properties of soil. It is a direct inducement of many engineering geology and environmental geological problems. Based on the work about crack in recent years at home and abroad, the research methods are summarized systematically, and the advantages and disadvantages of these methods are compared and analyzed. The results are as follows: (1) the research methods of soil cracking can be divided into two categories: experimental research and numerical simulation, and the experimental research can be divided into indoor test and field test. At present, the main task of this project is laboratory test. (the samples commonly used in laboratory tests are mainly mud samples and compacted samples, and the former is more popular in academic circles.) the soil cracking test mainly involves two key instruments and equipment. On the one hand, it is used to control the environmental conditions of the test, the representative is the environment box, on the other hand, it is used to monitor the related parameters of the crack development process, especially the geometric parameters of the fracture. In terms of test methods, the influence of one or more parameters on the formation and development of soil cracking, including the initial state, size and thickness of the sample, is studied by means of control variable method. Soil composition, ambient temperature, relative humidity, sample / container contact conditions and times of dry and wet cycles, etc.) the geometric structure parameters of crack network can be quickly extracted by using digital image processing technology. The field test can reflect the formation and development law of the real fracture to the maximum extent, but because of the time and effort of this kind of test, the objective reason is that it is put into a large amount of time and effort. Numerical simulation is one of the most important methods to study the cracking of soil mass. However, due to the lack of a unified understanding of the mechanism of crack development at this stage, the related research is still in its infancy. Finally, the focus of future research on soil cracking is put forward in view of the deficiency of current research.
【作者单位】：南京大学地球科学与工程学院;
【基金】：优秀青年科学基金(No.41322019) 国家自然学科基金(No.41572246) 国家自然科学基金重点项目(No.41230636) 江苏省“青蓝工程”(2014年) 中央高校基本科研业务费专项资金(2015年)~~
【分类号】：TU433

【相似文献】