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Viscoelasto-plastic rheological experiment under circular increment step load and unload and nonlinear creep model of soft rocks

ISSN号：1000-8993
期刊名称：《工业建筑》
时间：0
分类：TU452[建筑科学—岩土工程;建筑科学—土工工程] TS32[轻工技术与工程]
作者机构：[1]School of Resources and Safety Engineering, Central South University, Changsha 410083, China, [2]Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China
相关基金：Project（2007CB209400） supported by the Major State Basic Research and Development Program of China; Project（50774093） supported by the National Natural Science Foundation of China; Project（200801） supported by Open Research Fund of Hunan Provincial Key of Safe Mining Techniques of Coal Mines

作者：赵延林[1,2], 曹平[1], 王卫军[2], 万文[2], 刘业科[1]

关键词：蠕变模型, 软岩蠕变, 实验数据, 装卸过程, 非线性, 塑性流变, 增量, 圆形, rheological experiment, nonlinear creep, damaging, hardening, soft rocks

中文摘要：

粘弹性塑料爬在 Jinchuan 矿 III 的软矿石岩石的实验在圆形的增长步负担下面被执行并且卸掉。试验性的数据根据即时有弹性的紧张，粘弹性的紧张，即时塑料紧张和 visco 塑料的紧张被分析。即时变丑模量趋于到的结果表演随增加增加爬应力；软岩石提高能力在负担的多水平期间抵抗即时有弹性的变丑和即时塑料变丑并且在周期的过程卸掉。关于标本 JC1099，到 visco 塑料的紧张的粘弹性的紧张的比率从 3.15 ～ 6.58 变化，并且比率总体上随压力增加有减少的趋势；爬变丑趋于是在低应力的一个稳定的状态水平；软岩石爬通常表达加速爬在高应力的性质铺平。与损坏变量和介绍的变硬的函数，一非线性爬软岩石的模型被建立，在哪个腐烂爬被粘质系数的非线性的变硬函数 H 描述。模型能描述加速自从岩石的变丑参数的非线性的损坏发展变量 D 被介绍，软岩石爬。软岩石的三个阶段爬能与制服被描述爬方程在非线性爬模型。与这非线性爬用于 Jinchuan 矿 III 的矿石岩石的 creep 实验的模型，非线性爬模型的曲线在对试验性的数据的好同意。

英文摘要：

The viscoelastic-plastic creep experiments on soft ore-rock in Jinchuan Mine III were performed under circular increment step load and unload. The experimental data were analyzed according to instantaneous elastic strain, visco-elastic strain, instantaneous plastic strain and visco-plastic strain. The result shows that instantaneous deformation modulus tends to increase with the increase of creep stress; soft rocks enhance the ability to resist instantaneous elastic deformation and instantaneous plastic deformation during the multi-level of load and unload in the cyclic process. In respect of specimen JC1099, the ratio of visco-elastic strain to visco-plastic strain varies from 3.15 to 6.58, and the ratio has decreasing tendency with stress increase as a whole; creep deformation tends to be a steady state at low stress level; soft rocks creep usually embodies accelerated creep properties at high stress level. With the damaging variable and the hardening function introduced, a nonlinear creep model of soft rocks is established, in which the decay creep is described by the nonlinear hardening function H of viscidity coefficient. The model can describe the accelerated creep of soft rocks since the nonlinear damaging evolvement variable D of deformation parameter of rocks is introduced. Three stages of soft rocks creep can be described with the uniform creep equation in the nonlinear creep model. With this nonlinear creep model applied to the creep experiments of the ore-rock of Jinchuan Mine III, the nonlinear creep model＇s curves are in good agreement with experimental data.

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