阳煤一矿8303大采高工作面煤壁失稳特征及机理研究

发布时间：2018-08-06 17:55

【摘要】：大采高开采技术实现了工作面高产高效,但是煤壁稳定性问题制约了其安全高效生产。本论文采用理论分析、现场研究以及数值模拟相结合的方法,主要研究了大采高工作面煤壁在多因素作用下失稳特征及机理。重点研究了割煤高度、工作面长度、工作面推进速度、支架支护强度、支架护帮板支护强度、顶板强度、煤层强度、煤层埋深及煤层仰角对工作面煤壁稳定性的影响。采用数值模拟从剩余能量角度分析了工作面煤壁稳定性的主要影响因素。采用正交试验和回归分析得到了大采高工作面稳定性评价公式及评价指标,验证了 8303工作面失稳可能性。结合现场研究和数值模拟,研究了 8303工作面煤壁失稳特征及机理。基于大采高工作面煤壁失稳特征及机理,提出了大采高工作面稳定性控制技术措施。主要结论如下:(1)割煤高度、工作面长度、工作面推进速度、支架支护强度、支架护帮板支护强度、顶板强度、煤层强度、煤层埋深、煤层仰角及断层对工作面煤壁稳定性有影响,主要影响因素为割煤高度、工作面推进速度、煤层强度和煤层埋深,其显著性顺序为煤层强度煤层埋深割煤高度推进速度。(2)割煤高度、工作面推进速度、煤层硬度和煤层埋深与煤壁稳定性呈幂函数关系,多因素综合影响下工作面煤壁稳定性评价公式为Y =-9E7 + 4.01E7f-1.526 + 0.233H2 8011 + 4.62E5M2.4641 + 9.66E3V1.4972 ≤ 107J,验证了 8303工作面失稳的可能性。(3)8303工作面煤壁的失稳形式以中部煤层拉裂式片帮引发上部煤层剪切式片帮的复合式片帮为主。(4)中部煤层拉裂式片帮的破坏条件为及≤Rt≤2KP/πRarcsinb/R);上部煤层剪切片帮的失稳条件为Ch sec α+[QL+γ(2h-H+b/2L-H-b/2 tan α)](sin α tan φ-cos α)≤ 0。(5)复合式片帮主要与煤体的粘聚力、内摩擦角、抗拉强度、抗剪强度、煤体性质以及顶板压力有关。采用提高煤层强度、减小煤层割煤高度、加快煤层推进速度、加强支护管理保证支架支护强度、加强顶板管理、设计时避免煤层仰斜开采等措施改善顶板压力,减少其回转下沉量,有利于提高煤壁稳定性。
[Abstract]:The mining technology of large mining height has realized the high yield and high efficiency of coal face, but the stability of coal wall restricts its safe and efficient production. In this paper, theoretical analysis, field study and numerical simulation are used to study the instability characteristics and mechanism of coal wall in large mining face under the action of many factors. The influences of coal cutting height, working face length, working face advance speed, support strength, roof strength, coal seam depth and elevation angle on the stability of coal face wall are studied. The main influencing factors of coal wall stability in coal face are analyzed by numerical simulation from the angle of residual energy. By using orthogonal test and regression analysis, the evaluation formula and evaluation index of the stability of large mining face are obtained, and the possibility of instability in 8303 face is verified. Combined with field research and numerical simulation, the characteristics and mechanism of coal wall instability in 8303 face are studied. Based on the characteristics and mechanism of coal wall instability in large mining face, the technical measures of stability control in large mining face are put forward. The main conclusions are as follows: (1) the height of coal cutting, the length of working face, the speed of working face, the strength of support, the strength of roof, the depth of coal seam, The coal seam elevation angle and fault have influence on the stability of coal face wall. The main influencing factors are cutting height, working face advancing speed, coal seam strength and coal seam depth. The significant order is the advancing speed of cutting height of coal seam. (2) the height of cutting coal, the speed of coal face advancing, the hardness of coal seam and the depth of coal seam burying have power function relation with the stability of coal wall. Under the influence of multiple factors, the formula for evaluating the stability of coal face wall is Y / 9E7 4.01E7f-1.526 0.233H2 8011 4.62E5M2.4641 9.66E3V1.4972 鈮，

本文编号：2168525