高应力岩巷综掘施工围岩支护控制技术研究

矿井巷道存在深井高应力现象,科学合理的支护是保障矿井生产安全高效的关键。随着岩巷EBZ-318(H)综掘施工工艺的推广,掘巷初期对围岩的扰动小、破坏小,岩石承载巷道上方覆岩的能力强,主动开展岩巷综掘工艺巷道支护控制技术的研究,实现支护安全可靠、科学合理的目标,为类似条件下岩巷的安全快速掘进和支护施工提供经验。

深井高应力岩巷破坏特征及修复技术

针对陈四楼煤矿高应力岩巷变形剧烈,破坏形式多样化这一现象,通过详细的分析地质资料和现场调研,总结出巷道变形破坏的特征并分析出导致巷道破坏的主要因素,从而针对性地提出了围岩强化支护技术。采用多样化的支护方式和合理的支护参数设计,限制围岩进一步松散破碎变形,维护巷道的长期稳定。经过6个月的现场观测表明,高应力岩巷破坏情况得到了有效的控制,保障了矿井的安全生产,取得了良好的社会效益和经济效益。

基于综掘施工的高应力围岩控制技术研究

矿井巷道呈现深井高应力现象,科学合理的支护技术参数是保障矿井安全高效生产的关键。随着岩巷EBZ一318(H)综掘施工工艺的推广应用,掘巷初期对围岩扰动小、破坏小,岩石承载巷道上方覆岩的能力强,主动开展岩巷综掘工艺巷道的支护控制技术研究,实现支护安全可靠、科学合理目标,为类似条件下岩巷的安全快速掘进和支护施工提供经验。

Support failure of a high-stress soft-rock roadway in deep coal mine and the equalized yielding support technology： a case study

Abstract There are many soft-rock roadway coal mines in China. The surrounding rocks of the high-stress soft-rock roadways in deep mine are especially difficult to be supported using the traditional supporting way. In this study, the south wing rail roadway on the second level of Yunjialing coal mine in China was used as an example to analyze the deformation and failure characteristics and influencing factors of roadway. On this basis, this study proposed the equalized yielding support idea which employs the yielding rings to realize the pressure equalization on the bolts and cables in the section. To achieve this purpose, the first bolt-mesh-cable equalizing pressure yielding support was integrated with the second grouting reinforcement. The results proved that the yield rings of the bolts and cables on the spandrel of the arched roadway firstly developed yielding deformation; then the deformation extended to the vault of the roadway; the bolts and cables achieved a yielding extreme value of 15 and 18 tonnes, respectively. The roadway surrounding rock tended to be stable at the 26th day after the maintenance. The equalizing pressure yielding supporting technology plays a moderate pressure-releasing and actively controlling role on the surrounding rocks in the soft-rock roadway with large deformation.

The principle of stability control of surrounding rock-bearing structures in high stress soft rock roadways

Through the description of the deformational features of the surrounding rockaround high stress engineering soft rock roadways,the coupling stabilization principle ofinner and outer structures in surrounding rock was put forward.The supporting principlesof high stress engineering soft rock roadway (high resistance and yielding support,timelysupport,high strength and high stiffness supports) were proposed,which were applied inengineering practices,and obtained better achievements.

Principle and practice of coupling support of double yielding shell of soft rock roadway under high stress

In order to ensure the safety and stability of the soft rock roadway under high stress, based on the char- acteristics of the surrounding rock deformation and failure, this paper presented the support technology“coupling support of double yielding shell”, then gave the design method of inner and outer shells and analyzed the principle and requirements of the support technology by taking the -850 meast belt mad-way of Qujiang coal mine as the background. The field application results show that the support technol- ogy can control the soft rock roadway deformation better under high stress. The displacement between roadway sides was 851 mm, the displacement of the roof was 430 mm, and the displacement of the floor was 510 mm.

An experimental study of a yielding support for roadways constructed in deep broken soft rock under high stress

A rationally designed support for deep roadways excavated in broken soft rock under high stress was investigated. The deformation and failure characteristics and the mechanism of ''yielding support'' was studied for anchor bolts and cables. The rail roadway of the 2-501 working face in the Liyazhuang Mine of the Huozhou coal area located in Shanxi province was used for field trials. The geological conditions used there were used during the design phase. The new ''highly resistant, yielding'' support system has a core of high strength, yielding bolts and anchor cables. The field tests show that this support system adapts well to the deformation and pressure in the deep broken soft rock. The support system effectively controls damage to the roadway and ensures the long term stability of the wall rock and safe production in the coal mine. This provides a remarkable economic and social benefit and has broad prospects for fur- ther application.

Study on mechanism and practice of surrounding rock control of high stress coal roadway

The mechanical principle and surrounding rock deformation feature of highstress coal roadway was analyzed.The condition of stress balance of the kind of theroadway was put forward.The surrounding rock control principle and supporting techniqueof high stress coal roadway were discussed.It was very important to control early daysdeformation of coal sides.The supporting strength is should increased,so the strengthloss of coal sides is decreased.The range of plastic fluid zone is reduced.The abovemention-ned principle is applied in industrial test,and the new supporting technique is ap-plied successfully.