苇子沟煤矿立井井筒穿过采空区技术研究

发布时间：2018-08-24 09:05

【摘要】：随着煤炭资源的开采和对能源需求的加大,已探明可采煤炭资源日益减少,煤田残煤开发是十分必要的。在老矿区建井可能穿越采空区或塌陷区,盲目施工可发生岩层沉降、塌陷,井筒偏斜、脱落,导致重大质量和人员丧亡事故。因此,开展此项研究对在建矿井和今后类似矿井建设,具有重大的现实意义。本文依托“立井井筒穿过采空区的施工技术及压力显现研究”项目,以辽宁南票矿务局苇子沟煤矿副井井筒施工为背景,为保证副井精通施工安全,对立井井筒穿过采空塌陷区的施工技术及压力显现监测问题进行理论分析,并确定施工方案。本文主要研究内容如下：(1)综合地层地质资料、水文地质资料与采空区情况,根据检查钻孔揭露的覆岩情况和实际施工安全的需求,计算覆岩破坏高度。(2)应用秦氏公式计算表土地压和基岩地压,并且计算围岩的膨胀地压。从而得出井筒最大侧压力。根据采空区冒落带和导水裂缝带高度以及井筒附加应力的计算,为了实现监测采空区破碎带立井地压的大小及分布规律和井壁内应力大小及分布规律,确定2个监测水平,其深度分别为80m、95m。其中,80m水平主要测试井筒竖向应力、应变和地压,95m水平主要测试采空区覆岩破碎带立井地压和井壁切向应力与应变。(3)利用大型有限元软件ADNIA进行模拟。在85米处和89.5米处分别查看其应力(ADINA里拉应力为正,压应力为负)和Z向位移,模拟得出压力变化曲线得出模拟压力变化规律与应变变化规律。(4)根据以上压力测试结果以及数值计算结果,确定掘进作业方式采用掘砌混合作业施工方式,采用光面爆破和挂金属网加喷射混凝土临时支护,采取了一系列的安全技术措施。(5)为保证设计的正确和施工的安全,必须充分掌握井筒在施工过程中及生产期间的物理参数及其变化规律。通过施工中实际监测,记录数据分析整理出压力—时间曲线。并与理论分析和模拟分析的结果进行比较。
[Abstract]:With the exploitation of coal resources and the increase of energy demand, it has been proved that the recoverable coal resources are decreasing day by day, so it is very necessary to exploit the residual coal in coal field. In the old mining area, the construction of well may pass through the goaf or collapse area, blind construction may occur strata subsidence, collapse, wellbore deflection, shedding, leading to major quality and personnel death accident. Therefore, it is of great practical significance to carry out this study for the construction of existing mines and similar mines in the future. Based on the project of "study on Construction Technology and pressure manifestation of Vertical Shaft passing through Goaf", this paper takes the construction of auxiliary shaft in Weizigou Coal Mine, Liaoning Nanpiao Mining Bureau, as the background, in order to ensure the safety of the construction of auxiliary shaft. In this paper, the construction technology and pressure performance monitoring of borehole passing through the cave-in area are analyzed theoretically and the construction scheme is determined. The main contents of this paper are as follows: (1) synthesizing stratigraphic geological data, hydrogeological data and goaf conditions, according to the overburden conditions exposed by checking boreholes and the requirements of practical construction safety, The failure height of overburden rock is calculated. (2) the surface earth pressure and bedrock ground pressure are calculated by using Qin's formula and the swelling ground pressure of surrounding rock is calculated. Thus, the maximum sidewall pressure is obtained. Based on the calculation of the height of caving zone and water-conducting fracture zone in goaf and the additional stress of wellbore, in order to realize the monitoring of the size and distribution law of vertical pressure in broken zone of goaf and the law of stress distribution in shaft wall, two monitoring levels are determined. Its depth is 80 mv 95 m respectively. The vertical stress, strain and ground pressure of shaft are mainly measured at 80 m level, and the ground pressure and tangential stress and strain of shaft wall in overburden fractured zone in goaf are mainly measured at the level of 80 m. (3) the simulation is carried out by using the large-scale finite element software ADNIA. The stress (ADINA tensile stress is positive, compressive stress is negative) and Z-direction displacement are examined at 85 m and 89.5 m, respectively. The pressure variation curve is obtained by simulation. (4) according to the above pressure test results and numerical calculation results, the tunneling operation mode is determined to adopt the construction mode of combined excavation and masonry operation, and the pressure variation law and strain variation law are obtained. (4) according to the above pressure test results and numerical calculation results, A series of safety technical measures have been taken by using smooth blasting and metal mesh hanging and shotcrete temporary support. (5) in order to ensure the design and construction safety, It is necessary to fully understand the physical parameters of the wellbore during the construction process and the production period as well as its variation law. Through actual monitoring in construction, the recorded data are analyzed and sorted out the pressure-time curve. The results are compared with the results of theoretical analysis and simulation analysis.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD262

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