高压氮气致裂增透实验系统的研发及应用
发布时间：2018-08-24 12:38
【摘要】：以气体射流冲击和高压氮气的准静态膨胀作用理论为基础,自主研制了高压氮气爆破致裂煤岩体实验系统,开展了不同氮气压力(5、7.5、10 MPa)和不同高压容器体积(1、2、3 L)条件下的高压氮气爆破致裂实验,以获得煤岩体在高压氮气爆破致裂过程中的动态变化规律。结果表明:随着氮气压力的提高,试块从最初的纵向主裂纹扩展为纵横2条主裂纹,次生裂纹更加发育,试块的裂纹增多、破碎度和裂纹扩展断裂区增大;同等压力下,随着高压容器体积的增大,试块主裂纹长度明显增加,次生裂纹扩展受到抑制。由高压氮气爆破致裂的p-t曲线分析,可将高压氮气爆破致裂过程根据其特点的不同分为3个阶段:气体射流冲击阶段、起裂阶段和断裂阶段。
[Abstract]:Based on the theory of gas jet impingement and quasi-static expansion of high pressure nitrogen gas, an experimental system for cracking coal and rock mass by high pressure nitrogen blasting was developed. In order to obtain the dynamic variation of coal and rock mass in the process of high pressure nitrogen explosion, the cracking experiments of high pressure nitrogen blasting under different nitrogen pressure (5 ~ 7.5 ~ 10 MPa) and different high pressure vessel volume (1 ~ 2 ~ 3 ~ 3 L) were carried out in order to obtain the dynamic change of coal and rock mass in the process of high pressure nitrogen explosion. The results show that with the increase of nitrogen pressure, the specimen grows from the initial longitudinal main crack to the longitudinal and horizontal two main cracks, and the secondary crack is more developed, the crack of the specimen increases, the fracture degree and crack propagate fracture zone increases, and at the same pressure, With the increase of the volume of the high pressure vessel, the length of the main crack increases obviously, and the growth of the secondary crack is restrained. According to the analysis of p-t curve of high pressure nitrogen blasting, the fracturing process of high pressure nitrogen blasting can be divided into three stages according to its characteristics: gas jet impingement stage, initiation stage and fracture stage.
【作者单位】： 中国矿业大学煤炭资源与安全开采国家重点实验室;中国矿业大学安全工程学院;煤科集团沈阳研究院有限公司;
【基金】：国家自然科学基金资助项目(51474212) 江苏高校优势学科建设工程二期资助项目(苏政办发[2014]37号)
【分类号】：TD712.6
本文编号：2200842
[Abstract]:Based on the theory of gas jet impingement and quasi-static expansion of high pressure nitrogen gas, an experimental system for cracking coal and rock mass by high pressure nitrogen blasting was developed. In order to obtain the dynamic variation of coal and rock mass in the process of high pressure nitrogen explosion, the cracking experiments of high pressure nitrogen blasting under different nitrogen pressure (5 ~ 7.5 ~ 10 MPa) and different high pressure vessel volume (1 ~ 2 ~ 3 ~ 3 L) were carried out in order to obtain the dynamic change of coal and rock mass in the process of high pressure nitrogen explosion. The results show that with the increase of nitrogen pressure, the specimen grows from the initial longitudinal main crack to the longitudinal and horizontal two main cracks, and the secondary crack is more developed, the crack of the specimen increases, the fracture degree and crack propagate fracture zone increases, and at the same pressure, With the increase of the volume of the high pressure vessel, the length of the main crack increases obviously, and the growth of the secondary crack is restrained. According to the analysis of p-t curve of high pressure nitrogen blasting, the fracturing process of high pressure nitrogen blasting can be divided into three stages according to its characteristics: gas jet impingement stage, initiation stage and fracture stage.
【作者单位】： 中国矿业大学煤炭资源与安全开采国家重点实验室;中国矿业大学安全工程学院;煤科集团沈阳研究院有限公司;
【基金】：国家自然科学基金资助项目(51474212) 江苏高校优势学科建设工程二期资助项目(苏政办发[2014]37号)
【分类号】：TD712.6
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1 刘克生;王禹;朱智杲;;煤矿掘进高浓度高压氮气涌出的分析[J];中国新技术新产品;2012年21期
，本文编号：2200842
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