获取煤岩体原位物理力学参数是煤炭资源开发的首要任务，瓦斯原位参数精准测量是实现煤矿安全开采的基本保障。针对煤矿原位瓦斯参数测不准的技术难题，结合煤矿井下取心的技术特点，创新提出基于磁力控制的多向保压取心技术构想。基于复合磁场特性，自主设计了磁控自触发保压控制器，优化了取心触发及密封结构，关键保压构件实现磁控非接触式自触发及自密封，提升保压触发的容错率。自主研制了多向保压取心性能测试平台，基于该平台验证了保压控制器在不同取心角度的良好触发能力及自密封能力。集成磁控保压模块，形成多向保压取心装备，通过实验室测试验证了该装备可在多个方向实现保压取心，且保压能力可以达到6 MPa，满足煤矿保压取心条件。研究成果为深部煤矿多向保压取心提供了技术支持，为保压控制结构设计提供了全新思路。

Obtaining the in-situ physical and mechanical parameters of coal-rock mass is the primary task for the development of deep coal resource. Accurate measurement of the in-situ parameters of gas is the basic guarantee to realize the safe mining of coal. In view of the technical challenges of inaccurate measurement of in-situ gas parameters in coal mine, the idea of multi-directional pressure-preserved coring technology based on magnetic force control was proposed with consideration to the technical characteristics of coring in underground coal mines. Specifically, a self-triggered magnetically controlled pressure-preserved controller was designed based on the characteristics of the composite magnetic field. The triggering and sealing structure for coring was optimized. The key pressure-preserved components realized the non-contact self-triggering and self-sealing by magnetic force control, thus improving the fault tolerance of the pressure-preserved trigger. Besides, a test platform functioning for multi-directional pressure-preserved coring was developed independently. With the self-developed test platform, it was verified that the pressure-preserved controller had a good triggering and self-sealing ability at different coring angles. In addition, a magnetically controlled pressure-preserved module was integrated to form a multidirectional pressure-preserved coring device. Moreover, laboratory tests were conducted to verify that the device could realize the pressure-preserved coring in multiple directions, and the pressure-preserved capacity could reach 6 MPa, which meets the condition of pressure-preserved coring in coal mines. The research results provide technical support for the multidirectional pressure-preserved coring in deep coal mines and provide a new idea for the design of pressure-preserved control structure.