Crack damage stress in fully saturated, permeable rocks: A new detection procedure

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Geoscientific Instrumentation Methods and Data Systems Pub Date : 2024-04-18 DOI:10.5194/egusphere-2024-1074
Sandra Schumacher, Werner Gräsle
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Abstract

Abstract. To detect the crack damage stress also known as onset of dilatancy in fully saturated rocks, we propose a new procedure which combines an innovative measurement technique using pore pressure diffusion with the well known technique of finding the pore pressure maximum. A precise determination of the crack damage stress is required to establish parameter dependencies and ultimately to develop a constitutive equation for the crack damage stress, which is of significant interest e.g. for the long-term safety analysis of repositories for radioactive waste. The new technique monitors the true axial strain as indicator for the crack damage stress during a pore pressure diffusion test. In addition to the crack damage stress, this new true axial strain method simultaneously yields pore pressure diffusion coefficients, thereby maximising the information gain. The true axial strain method was developed based on a multi-cycle, long-term experiment of one sample of Passwang Marl, but it can be applied to other types of rocks, which is demonstrated on a Bunter Sandstone.
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完全饱和透水岩石的裂缝破坏应力:一种新的检测程序
摘要为了检测完全饱和岩石中的裂缝破坏应力(也称膨胀开始应力),我们提出了一种新的程序,该程序将利用孔隙压力扩散的创新测量技术与众所周知的寻找孔隙压力最大值的技术相结合。裂缝破坏应力的精确测定需要建立参数依赖关系,并最终制定出裂缝破坏应力的构成方程,这对于放射性废物储存库的长期安全分析等具有重要意义。新技术在孔隙压力扩散试验中监测真实轴向应变,作为裂缝破坏应力的指标。除裂缝破坏应力外,这种新的真实轴向应变方法还能同时获得孔隙压力扩散系数,从而最大限度地获得信息。真实轴向应变方法是在对帕斯旺泥灰岩的一个样本进行多周期、长期实验的基础上开发出来的,但它也可应用于其他类型的岩石,这一点已在布恩特砂岩上得到证实。
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来源期刊
Geoscientific Instrumentation Methods and Data Systems
Geoscientific Instrumentation Methods and Data Systems GEOSCIENCES, MULTIDISCIPLINARYMETEOROLOGY-METEOROLOGY & ATMOSPHERIC SCIENCES
CiteScore
3.70
自引率
0.00%
发文量
23
审稿时长
37 weeks
期刊介绍: Geoscientific Instrumentation, Methods and Data Systems (GI) is an open-access interdisciplinary electronic journal for swift publication of original articles and short communications in the area of geoscientific instruments. It covers three main areas: (i) atmospheric and geospace sciences, (ii) earth science, and (iii) ocean science. A unique feature of the journal is the emphasis on synergy between science and technology that facilitates advances in GI. These advances include but are not limited to the following: concepts, design, and description of instrumentation and data systems; retrieval techniques of scientific products from measurements; calibration and data quality assessment; uncertainty in measurements; newly developed and planned research platforms and community instrumentation capabilities; major national and international field campaigns and observational research programs; new observational strategies to address societal needs in areas such as monitoring climate change and preventing natural disasters; networking of instruments for enhancing high temporal and spatial resolution of observations. GI has an innovative two-stage publication process involving the scientific discussion forum Geoscientific Instrumentation, Methods and Data Systems Discussions (GID), which has been designed to do the following: foster scientific discussion; maximize the effectiveness and transparency of scientific quality assurance; enable rapid publication; make scientific publications freely accessible.
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