综采面末采贯通过上覆综放面倒台阶煤柱期间底鼓防治技术研究

Research on the control technology of floor heave during the final mining of fully mechanized mining face passing through the overlying inverted-step coal pillar of fully mechanized caving face

为了解决大柳塔活鸡兔井22209综采工作面末采期间矿压显现剧烈、刮板输送机机尾段底鼓严重、回撤通道围岩变形大且难以控制等问题,结合现场观测及数值模拟的手段对综采工作面末采贯通期间过上覆综放面倒台阶煤柱时的应力状态进行了分析,得到了工作面与上覆倒台阶煤柱在不同空间位置下对回采工作面的影响。基于此,采取了超前支护以及在工作面顶板施工固定锚索及让压开采的技术措施来进行防治。通过对回撤通道两帮和顶板移近量的监测发现,巷道变形稳定,减小了上覆综放工作面煤柱带来的影响,保证了工作面的安全高效生产。

In order to solve the problems of severe mine pressure,severe floor heave at the tail section of scraper conveyor,and large deformation of surrounding rock of the retreat channel during the final mining period of 22209 fully mechanized mining face in Daliuta Huojitu Well,the stress state during the final mining of fully mechanized mining face passing through the overlying inverted-step coal pillar of fully mechanized caving face was analyzed by combining on-site observation and numerical simulation methods,and the influences of different spatial positions between the working face and the overlying inverted-step coal pillar on the mining face were obtained.On the basis,advanced support,fixed anchor cables construction in roof,and pressure-yielding mining measures were adopted to prevent these problems.Through monitoring the movement of the two sides of the retreat channel and the roof,it was found that the deformation of the roadway was stable,reducing the impact of the overlying coal pillars on the fully mechanized caving face and ensuring safe and efficient production of the working face.