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Response characteristics of gas pressure under simultaneous static and dynamic load:Implication for coal and gas outburst mechanism

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International Journal of Mining Science and Technology 2023年第2期33卷 155-171页

作者： Longyong Shu liang Yuan qixian li Wentao Xue Nannan Zhu Zhengshuai liu School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China Mine Safety Technology Branch China Coal Research InstituteBeijing 100013China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science&TechnologyHuainan 232001China China Coal Research Institute Beijing 100013China

Coal and gas outbursts are dynamic disasters in which a large mass of gas and coal suddenly emerges in a mining space within a split *** interaction between the gas pressure and stress environment is one of the key factors that induce coal and gas *** this study,first,the coupling relationship between the gas pressure in the coal body ahead of the working face and the dynamic load was investigated using experimental observations,numerical simulations,and mine-site *** was observed that the impact rate of the dynamic load on the gas-bearing coal can significantly change the gas *** faster the impact rate,the speedier the increase in gas ***,the gas pressure rise was faster closer to the impact ***,based on engineering background,we proposed three models of stress and gas pressure distribution in the coal body ahead of the working face:static load,stress disturbance,and dynamic load ***,the gas pressure distribution and outburst mechanism were *** high concentration of gas pressure appearing at the coal body ahead of the working face was caused by the dynamic *** gas pressure first increased gradually to a peak value and then decreased with increasing distance from the working *** increase in gas pressure plays a major role in outburst initiation by resulting in the ability to more easily reach the critical points needed for outburst ***,the stronger the dynamic load,the greater the outburst initiation *** results of this study provide practical guidance for the early warning and prevention of coal and gas outbursts.

关键词： Coal and gas outburst Gas pressure Dynamic load Outburst mechanism

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Optimal Scheduling Method of Multi-Energy Hub Systems Based on Bayesian Game Theory

Optimal Scheduling Method of Multi-Energy Hub Systems Based ...

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第40届中国控制会议

作者： Jing Xu Huizhen Pang Bingzhe Zhang qixian li Yu Huang Department of Automation North China Electric Power University

Since it is difficult to guarantee the completeness of information in the market competition, it is of great significance to study the operation and optimization of multi-energy hub（EH） systems under incomplete information for the stability and economic operation of the system. However, under the dynamic energy pricing mechanism, each EH restricts each other, and the optimal scheduling of each EH is affected by the seriously coupled energy flow and incomplete information. Therefore this paper analyzes the relationship between EHs under the dynamic energy pricing mechanism, and uses Bayesian game to solve the optimal scheduling problem of multi-EH systems under the condition of incomplete information. According to the incomplete information of CHP operation mode in EHs, each EH is modeled as different types, and then the multi-EHs optimal scheduling model based on Bayesian game is established, and the Bayesian Nash equilibrium is solved. The effectiveness of the model and solution method is verified by the case.

关键词： Multi-energy hub system Thermoelectric decoupling Energy hub Bayesian game Economic dispatch

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Intelligent Attack Method Research on the Pressure Control System of Pressurizer

Intelligent Attack Method Research on the Pressure Control S...

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第40届中国控制会议

作者： qixian li Bingzhe Zhang Shan Gao Huizhen Pang Dongfeng Wang Department of Automation North China Electric Power University

In order to provide help to the research and development of security defense system for pressurizer in nuclear power plant, this paper studies the potential attack mode in pressurizer distributed control system（DCS） and proposes a covert attack approach based on least square support vector machine（LSSVM） algorithm. This method uses the LSSVM algorithm to identify the system to obtain a high-precision estimation model of the attacked area of pressurizer, and use this estimation model to realize the covert attack. The simulation results show that the attack method not only causes some damage to the pressure control system of pressurizer, but also has high concealment performance.

关键词： pressurizer pressure control system DCS covert attack LSSVM

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Nonlinear time-reversal interferometry with arbitrary quadratic collective-spin interaction

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Chinese Physics B 2024年第8期33卷 63-70页

作者：胡知遥李其贤张轩晨张贺宾黄龙刚刘永椿 State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China School of Physics Xi'an Jiaotong UniversityXi'an 710049China China Fire and Rescue Institute Beijing 102202China Frontier Science Center for Quantum Information Beijing 100084China

Atomic nonlinear interferometry has wide applications in quantum metrology and quantum information *** we propose a nonlinear time-reversal interferometry scheme with high robustness and metrological gain based on the spin squeezing generated by arbitrary quadratic collective-spin interaction,which could be described by the lipkin–Meshkov–Glick(LMG)*** optimize the squeezing process,encoding process,and anti-squeezing process,finding that the two particular cases of the LMG model,one-axis twisting and two-axis twisting outperform in robustness and precision,***,we propose a Floquet driving method to realize equivalent time reverse in the atomic system,which leads to high performance in precision,robustness,and *** study sets a benchmark for achieving high precision and high robustness in atomic nonlinear interferometry.

关键词： time-reversal interferometry spin squeezing quantum metrology

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近距离下行逐层开采底板应变时空差异特征

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采矿与安全工程学报 2018年第5期35卷 997-1004,1013页

作者：洛锋曹树刚李国栋李勇李奇贤河北工程大学矿业与测绘工程学院河北省煤炭矿井建设工程技术研究中心河北邯郸056038 重庆大学煤矿灾害动力学与控制国家重点实验室重庆400044

为了研究近距离煤层群下行逐层开采条件下底板裂隙岩体的应力-应变演化过程,采用相似材料模拟实验方法,结合渝阳煤矿M7、M8煤层的实际地质条件进行模拟分析,获得了一次采动与二次采动条件下煤层群底板应变时空差异特征,并进行了数值模... 详细信息

为了研究近距离煤层群下行逐层开采条件下底板裂隙岩体的应力-应变演化过程,采用相似材料模拟实验方法,结合渝阳煤矿M7、M8煤层的实际地质条件进行模拟分析,获得了一次采动与二次采动条件下煤层群底板应变时空差异特征,并进行了数值模拟验证。研究表明:一次采动条件下,距开切眼较近(减压区范围)与较远的底板岩层分别经历"低应力压缩-卸压膨胀-膨胀稳定"与"高应力压缩-卸压膨胀-重新压实"两个不同应变演化过程。空间上,随工作面推进,底板岩层应变变化量经历由"S"形向"驼峰"状分布曲线过渡的演化过程;二次采动条件下,距开切眼较近位置未出现低应力压缩过程,而是直接出现卸压膨胀然后趋于稳定。空间上,随工作面推进,底板岩层应变变化量经历由拱形分布曲线向"S"形分布曲线过渡的演化过程。两次采动底板各点所经历的应变变化量峰值自开切眼分别呈现"递增"和"∧"形分布。这说明近距离煤层群下行开采过程中,覆岩采空区压实和膨胀区均参与底板应力重新分布过程,应变数值和变化规律与上覆岩层压实范围、原始压力载荷基数、空间边界有关。

关键词：近距离煤层下行开采底板应变演化时空差异性

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基于LSSVM的核电厂稳压器压力控制系统隐蔽攻击方法研究

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核动力工程 2022年第1期43卷 133-140页

作者：王东风李其贤黄宇徐璟王彪华北电力大学自动化系河北保定071003

隐蔽攻击对大型核电厂稳压器压力控制系统的安全、稳定、高效运行构成了严重威胁,实现隐蔽攻击的关键是建立高精度的对象估计模型。本文提出了一种基于最小二乘支持向量机(LSSVM)的隐蔽攻击方法,通过LSSVM算法进行系统辨识,获得稳压器... 详细信息

隐蔽攻击对大型核电厂稳压器压力控制系统的安全、稳定、高效运行构成了严重威胁,实现隐蔽攻击的关键是建立高精度的对象估计模型。本文提出了一种基于最小二乘支持向量机(LSSVM)的隐蔽攻击方法,通过LSSVM算法进行系统辨识,获得稳压器受攻击区域高精度的估计模型,随后利用该估计模型结合隐蔽控制器实施攻击,实现稳压器压力控制系统在无噪声、有噪声及包含非线性环节情况下的隐蔽攻击。仿真结果表明,该攻击方式对稳压器压力控制系统造成一定破坏的同时具有高度的隐蔽性。

关键词：稳压器压力控制系统隐蔽攻击最小二乘支持向量机(LSSVM)算法噪声分析

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多层叠置煤层气系统合采方式及其优化

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煤炭学报 2018年第6期43卷 1677-1686页

作者：许江张超林彭守建贾立郭世超李奇贤重庆大学煤矿灾害动力学与控制国家重点实验室重庆400044

针对"多层叠置煤层气系统"这一特殊煤层气成藏模式,自主研发了多层叠置煤层气系统合采试验装置,并取得:(1)开展了储层气压分别为1.0,1.4,1.8和2.2 MPa条件下4层叠置煤层气系统常规合采试验,发现在合采过程中,气体由高气压煤层通过合采... 详细信息

针对"多层叠置煤层气系统"这一特殊煤层气成藏模式,自主研发了多层叠置煤层气系统合采试验装置,并取得:(1)开展了储层气压分别为1.0,1.4,1.8和2.2 MPa条件下4层叠置煤层气系统常规合采试验,发现在合采过程中,气体由高气压煤层通过合采井筒流向低气压煤层,抑制了低气压煤层气体的产出,不利于煤层气的合采;(2)通过优化不同煤层产气时间开展了递进合采试验,有效避免不同煤层之间发生气体倒灌现象,使得最低储层气压煤层采收率和整体采收率分别提高了6.5%和1.3%;(3)递进合采能降低高储层气压煤层产能贡献率同时提高低储层气压煤层产能贡献率,使得产能分配更加合理;(4)叠置煤层整体差异系数呈先升后降的变化趋势,表明优化前后两种合采方式差异随着合采的进行处于动态变化之中,在合采中期达到最大,在合采后期略有下降。

关键词：多层叠置煤层气系统合采产能贡献率采收率差异系数

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不同层间压差条件下叠置含气系统的定产合采试验研究

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煤炭科学技术 2020年第1期48卷 46-53页

作者：许江李奇贤彭守建韩恩德重庆大学煤矿灾害动力学与控制国家重点实验室重庆400044 重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室重庆400044

为了研究滇东-黔西地区的多层叠置含气系统煤层气合采的产气特征,以4层合采方式为研究背景,利用大型多场耦合煤层气开采物理模拟试验系统展开3组不同层间压差条件下的定产煤层气合采物理模拟试验,研究了4个煤层在煤层气合采过程中的储... 详细信息

为了研究滇东-黔西地区的多层叠置含气系统煤层气合采的产气特征,以4层合采方式为研究背景,利用大型多场耦合煤层气开采物理模拟试验系统展开3组不同层间压差条件下的定产煤层气合采物理模拟试验,研究了4个煤层在煤层气合采过程中的储层压力、瞬时产量、产能贡献率等参数动态演化规律。研究结果表明:在合采过程中,1号煤层的储层压力在11.5 min上升至1.1 MPa,出现明显的压力上升,这是由于煤层之间的储层压力差过大会形成层间干扰现象,使低气压煤层的储层压力上升,但该现象主要发生在合采初期,并随着合采时间的延长而减弱;在11.25 L/min的定产生产条件下,1-4号煤层的初始瞬时产量分别为-23.4、-1.6、9.3、18.3 L/min,因此当单层产气能力高于定产值时,高气压煤层的部分产气量通过井筒汇入低气压煤层,形成倒灌现象,且层间压差越大,倒灌的气量越大;在0.2、0.3和0.5 MPa的3种层间压差条件下,1号煤层在第10 min的产气贡献率分别为-3.2%、-10.4%、-16.9%,所以在合采初期,层间压差越大,对低气压煤层的产气的抑制作用越大;在稳产期内,不同储层压力的煤层产气呈现为一种"动态平衡"的产气特征,即当相对高气压煤层的产气能力不足时,相对低气压煤层的产气能力开始增加,从而维持稳定产气。

关键词：多层叠置含气系统煤层气多层合采层间干扰

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