摘要
3305综采工作面采用多回撤通道工艺提高综采设备回撤效率,但是采面顶板上覆存在有坚硬且厚度较大的细粒砂岩,若不对顶板进行弱化,则采面末采期间面临矿压显现明显、回撤通道支护难度大以及液压支架容易倾倒等问题。为此,提出采用高压水力压裂技术对末采范围内坚硬顶板进行弱化,对弱化技术方案进行设计并进行工程应用。现场应用实践表明,通过对末采期间顶板进行弱化,采面末采期间矿压显现强度及周期来压步距等均明显降低,可为采面与回撤通道贯通创造良好条件。
The 3305 fully mechanized mining face adopts the technology of multiple withdrawal channels to improve the withdrawal efficiency of fully mechanized mining equipment.However,the roof of the mining face is covered with hard and thick fine-grained sandstone.If the roof is not weakened,the mining face will face problems such as obvious rock pressure,difficult support of the withdrawal channel and easy collapse of the hydraulic support during the final mining.Therefore,it is proposed to use high-pressure hydraulic fracturing technology to weaken the hard roof slab in the final mining range,and design the weakening technical scheme and carry out engineering application.The field application practice shows that by weakening the roof during the final mining period,the apparent strength of rock pressure and the periodic weighting step during the final mining period of the mining face are significantly reduced,which can create good conditions for the connection of the mining face and the withdrawal channel.
作者
赵立志
Zhao Lizhi(Shanxi Fenxi Zhongxing Coal Industry Co.,Ltd.,Jiaocheng Shanxi 030500)
出处
《山西化工》
2023年第2期139-140,147,共3页
Shanxi Chemical Industry
关键词
综采工作面
末采
顶板
水力压裂技术
弱化技术
fully mechanized mining face
final mining
top plate
hydraulic fracturing technology
weakening technology
