应力-渗流耦合三轴渗透试验系统研制及其在充填介质渗透特性试验中的应用

发布时间：2018-02-27 02:21

本文关键词： 充填型岩溶管道充填介质渗流特性试验系统　出处：《岩土力学》2017年10期 　论文类型：期刊论文

【摘要】：为研究充填介质在赋存条件下的渗透、力学特性及其破坏机制,改进研制了大比尺三轴应力-渗流耦合试验系统,开发了三维应力-渗流耦合压力室,进行了完善的密封和加载系统设计。系统具备自动化轴压加载、围压渗压加载、涌水涌砂量采集和多元信息并行监测等功能,该套装置可针对大尺寸、不同规格岩溶管道和裂隙还原其在原始地应力状态下进行渗透性及相关力学试验研究。围压、渗压值可分别加到2 MPa和5 MPa,轴向荷载最大可加到300 kN。光纤技术、电阻元件柔性防水技术和自动化数据采集分析系统的应用,实现了水环境下试件内部渗压、应变的精确采集和分析。在试验系统的基础上,开展了赋存环境下充填介质渗透特性试验研究,分析了充填介质类型、渗流路径、管道断面形状及应力条件4种因素对渗透特性的影响及充填介质的响应特征,揭示了充填体稳定性和渗透性的变化规律。该装置解决了小水力梯度及赋存条件下的充填介质渗透特性和力学性质试验研究技术难题,具有重要意义。
[Abstract]:In order to study the permeability, mechanical properties and failure mechanism of filling medium under existing conditions, a large scale triaxial stress-seepage coupling test system was developed, and a three-dimensional stress-seepage coupling pressure chamber was developed. A perfect sealing and loading system is designed. The system has the functions of automatic axial compression loading, confining pressure loading, sand gushing collection and multi-information parallel monitoring. The system can be used for large size. The permeability and related mechanical tests of karst pipelines and fractures with different specifications under the original in-situ stress state were studied. The confining pressure and osmotic pressure can be added to 2 MPa and 5 MPA, respectively, and the maximum axial load can be added to 300kN. optical fiber technology, The application of flexible waterproof technology of resistance element and automatic data acquisition and analysis system realizes accurate collection and analysis of internal seepage pressure and strain of the specimen under water environment. In this paper, the permeation characteristics of filling medium under existing environment are studied, and the effects of filling media type, seepage path, pipeline section shape and stress condition on the permeability characteristics and the response characteristics of filling medium are analyzed. It is of great significance to solve the technical problems of the experimental study on the permeability and mechanical properties of the filling medium under the condition of small hydraulic gradient and its occurrence.
【作者单位】：山东大学岩土与结构工程研究中心;华南理工大学亚热带建筑科学国家重点实验室;山东大学新材料与智能装备研究院;
【基金】：国家自然科学基金面上基金(No.51679131);国家自然科学基金(No.51609129) 山东省自然科学基金(No.2014ZRE27303) 山东省杰出青年基金项目(No.JQ201611) 华南理工大学亚热带建筑科学国家重点实验室开放研究项目(No.2016ZB07)~~
【分类号】：TV139.1

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