为探讨金刚石串珠绳锯割缝对缝槽周围煤层的卸压增透效应，首先建立基于缝槽顶板受力的两端固支梁力学模型，分析顶板梁的受力特征及缝槽顶板下沉接触底板(简称触底)特性，然后采用自行设计的物理相似模拟试验平台开展相似模拟试验，分析不同工艺参数绳锯割缝后缝槽上下方煤岩层应力、位移变化规律，基于FLAC^3D数值模拟和开发的煤层瓦斯渗透率计算程序，分析随割煤工作面推进缝槽周围煤岩体的应力和渗透率分布特征和周期演化规律。研究表明：绳锯割缝使缝槽周围应力重新分布，缝槽顶板随着割缝工作面的推进经过顶板悬露、顶板触底，连续缓沉3种演化形态；顶板未触底时，缝槽上下方形成“U”形卸压区，最大挠度在顶板中心位置，也是最先触底部位，顶板触底之后，缝槽中间位置出现应力恢复，减弱绳锯割缝的卸压增透效果；串珠绳锯的直径越大，顶板发生触底的极限跨度越大，缝槽触底越晚，卸压效果越好；相同割缝直径增加第2条割缝，两缝槽卸压区连成一起，卸压效果相互促进，减弱两缝作用下的应力恢复现象，增大了卸压范围；缝槽推进距离足够长时，由于顶板触底，缝槽两边的卸压增透效果更好，割缝卸压的影响范围从左到右划分为应力集中区、卸压区、应力恢复区、卸压区、应力集中区，对应的卸压区和应力恢复区都有较好的增透效果。

In order to explore the pressure relief and permeability enhancement effect around coal seam slot cut by diamond-bead wire saw, firstly, the mechanical model of a doubly clamped roof beam based on the stress of the slot roof was established to analyze the force characteristics of the roof beam and the characteristics of the sinking contact bottom of slot roof (referred to as the contact bottom). Besides, the self-designed physical similarity simulation test platform was used to carry out various similar simulation tests to analyze the stress and displacement changes of coal and rock strata above and below the slot after cutting the seam using wire saw with different process parameters. Finally, based on the FLAC^3D numerical simulation and the development of a coal seam gas permeability calculation program, the distribution characteristics and periodic evolution laws of stress and permeability of coal and rock mass around the advancing slot of the coal working face were analyzed. The research shows that the wire saw cuts seams, which makes the stress around the slot redistribute, and the slot roof passes through three evolution forms of roof hanging, roof contact with the bottom, and continuous sinking with the advancement of the working face. When the roof does not touch the bottom, the upper and lower parts of the slot form a ‘U’-type pressure relief zone. The maximum deflection is at the center of the roof, which is also the first part to contact the bottom. After the roof contacts the bottom, the stress recovery occurs in the middle of the slot, which weakens the pressure relief and permeability enhancement effect of the slot. The larger the diameter of the diamond-bead wire saw is, the larger the ultimate span of the roof bottom is, the later the slot contacts the bottom, and the better the pressure relief effect is. With the same slot diameter, the second slot is added, and the pressure relief zone of the two slots is connected. The pressure relief effects promote each other, which weakens the stress recovery under the action of the two slots and increases the pressure relief range. When the slot advancing distance is long enough, due to the roof contacting the bottom, the pressure relief and permeability enhancement effect on both sides of the slot is better. The influence range of pressure relief is divided into stress concentration zone, pressure relief zone, stress recovery zone, pressure relief zone and stress concentration zone from left to right. The corresponding pressure relief zone and stress recovery zone have a better permeability enhancement effect.