Experimental study on the variation of physical and mechanical properties of rock after high temperature treatment
Experimental study on the variation of physical and mechanical properties of rock after high temperature treatment
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DOI：
10.1016/j.applthermaleng.2016.01.010
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发表时间：
2016-04-05
影响因子：
6.4
通讯作者：
Lv, Chao
中科院分区：
文献类型：
--
作者：
Zhang, Weiqiang;Sun, Qiang;Lv, Chao
加热后岩石的矿物成分、内部结构和含水量的变化导致了岩石物理力学性质的变化。本文旨在研究热效应（25℃~ 500℃）对岩石物理力学性能（如质量、密度、孔隙度、纵波速度、抗压强度、峰值应变、弹性模量）的影响。总结了大量的文献报道，并进行了大量的补充试验，结果表明：(1)根据黏附水、束缚水和结构水的逸出温度区间，将25℃~ 500℃的温度范围划分为3个阶段：在室温~ 100℃、100℃~ 300℃、300℃~ 500℃阶段，岩石的孔隙度、渗透率和声发射均显著增大，而波速则持续下降。前三个阶段的温度范围是相对应的。(2)岩石的抗压强度、抗拉强度、渗透率、波速等物理力学性能在200℃~ 500℃范围内变化明显，在200℃~ 300℃范围内，强结合水的损失导致微裂缝增多，连通性较好。在400℃~ 500℃温度范围内，岩石性质的变化与失组成水的脱羟基作用和固体矿物的膨胀有关，表现为体积变大，微裂纹数量迅速增加，同时抗拉强度、抗压强度和波速下降。(C) 2016 Elsevier Ltd.版权所有。
The changes of mineral components, internal structure and water content of the rock after heating lead to the variation of the physical and mechanical properties. This paper aims to study the thermal effect (from 25 degrees C to 500 degrees C) on physical and mechanical properties (such as mass, density, porosity, P-wave velocity, compressive strength, peak strain, elastic modulus) of rock. A lot of reported results about it were summarized and many complementary tests have been carried out, the results indicated that: (1) Based on the temperature interval of the escaping of adhered water, bound water and structural water, the temperature range in 25 degrees C-500 degrees C can be divided into three stages: from room temperature to 100 degrees C, 100 degrees C-300 degrees C and 300 degrees C-500 degrees C. In the second and third stages, the porosity, permeability and acoustic emission of rock increase significantly, while the wave velocity is keeping falls. The temperature ranges in three previous stages are corresponding. (2) The physical and mechanical properties of rocks such as compressive strength, tensile strength, permeability and wave velocity change apparently in temperature from 200 degrees C to 500 degrees C. In the range of 200 degrees C-300 degrees C, the strong bound water's loss leads to the increasing number of micro fracture and a better connectivity. In the temperature range of 400 degrees C-500 degrees C, the change of rock's property is related to the dehydroxylation of the losing constitution water and solid mineral's expansion, which can be described as the volume becomes bigger and the number of micro cracks increases rapidly, at the same time, the tensile strength, compressive strength and wave velocity decrease. (C) 2016 Elsevier Ltd. All rights reserved.