真三轴气固耦合煤体渗流试验系统的研制及应用

发布时间：2018-06-17 20:16

  本文选题：采矿工程 + 气-固耦合　； 参考：《岩土力学》2016年07期

【摘要】：为了更真实地模拟煤岩在掘进巷道迎头等环境下的应力状态,研究三向应力环境下煤岩的损伤变形及瓦斯渗流情况,自主研发了真三轴气-固耦合煤体渗流试验系统。该装置主要由真三轴压力室、液压伺服系统、气体渗流系统和监测与控制系统组成,采用的试件尺寸为200 mm×100 mm×100 mm,可施加的最大轴压(σ1)为70 MPa、最大侧压(σ2)为35 MPa、最大侧压(σ3)为10 MPa、最大瓦斯压力为6 MPa。该装置具有以下特点:(1)σ1、σ2采用刚性压头加载,σ3采用柔性加载,三向应力分别独立加载;(2)设计了刚柔性压头及传压滑杆,使得σ1与σ2方向压头在同时加载过程中互不干扰;(3)通过伺服液压系统控制加载功能,使得装置性能稳定,应力与位移加载精确,易于控制;(4)气体渗流系统采用蜂窝孔对试件进行面通气,确保试件进气端瓦斯压力均匀分布;(5)采用多种高精度传感器进行监测,实时记录煤体所受应力值、变形量及瓦斯渗流量。用两种不同应力路径下的渗流试验对该系统准确性和可靠性进行了验证,结果表明,该装置性能稳定可靠。该装置可用于揭示煤与瓦斯在三向应力条件下的耦合作用机制,为防治瓦斯灾害及研究瓦斯抽采提供了可靠的试验基础。
[Abstract]:In order to simulate the stress state of coal and rock in the head-on environment of tunneling roadway and to study the damage deformation and gas seepage of coal and rock under three direction stress environment, a true triaxial gas-solid coupling coal body seepage test system was developed. The device consists of a true triaxial pressure chamber, a hydraulic servo system, a gas seepage system and a monitoring and control system. The size of the specimen is 200 mm 脳 100 mm, the maximum axial pressure (蟽 1) is 70 MPA, the maximum lateral pressure (蟽 2) is 35 MPA, the maximum lateral pressure (蟽 3) is 10 MPA, and the maximum gas pressure is 6 MPA. The device has the following characteristics: 1) 蟽 1, 蟽 2 is loaded by rigid head, 蟽 3 is loaded by flexible load, and 3 direction stress is loaded independently. (2) rigid flexible head and pressure transfer slider are designed. It makes 蟽 _ 1 and 蟽 _ 2 direction presser not interfere with each other in the process of simultaneous loading. The servo hydraulic system controls the loading function, which makes the device stable in performance and accurate in the loading of stress and displacement. The gas percolation system is easy to control. The honeycomb hole is used for surface ventilation to ensure the uniform distribution of gas pressure at the inlet end of the specimen. Various kinds of high precision sensors are used for monitoring, and the stress values of coal body are recorded in real time. Deformation and gas seepage flow. The accuracy and reliability of the system are verified by seepage tests under two different stress paths. The results show that the performance of the system is stable and reliable. The device can be used to reveal the coupling mechanism of coal and gas under the condition of three direction stress. It provides a reliable experimental basis for preventing and controlling gas disaster and studying gas drainage.
【作者单位】： 山东科技大学矿业与安全工程学院;山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地;中煤科工集团重庆研究院瓦斯灾害监控与应急技术国家重点实验室;
【基金】：国家自然科学基金资助项目(No.51304128,No.51304237) 山东省自然科学基金(No.ZR2013EEQ015) 高等学校博士学科点专项科研基金资助课题(No.20133718120013) 山东科技大学杰出青年科技人才支持计划资助(No.2015JQJH105);山东科技大学研究生创新基金资助项目(YC150305) 山东省重点研发计划项目资助(No.2015GSF120016)~~
【分类号】：TD712
，

本文编号：2032315