考虑蠕变影响的近断层软岩巷道变形破坏特征与支护对策

崔魏; 崔峰

考虑蠕变影响的近断层软岩巷道变形破坏特征与支护对策

崔魏,
崔峰

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出版历程
- 发布日期: 2021-11-19

Deformation-failure characteristics and support countermeasures of soft roadway near a fault considering the creep influence

CUI Wei,
CUI Feng

摘要

摘要: 为研究近断层软岩巷道变形破坏时效特征及确定其合理的支护方式，以安里煤矿1条回风大巷为背景，考虑泥岩的蠕变特性，对掘进过程中围岩的位移和塑性区进行数值分析，提出了“锚索+锚杆+喷射混凝土+注浆”联合支护方案。研究结果表明：当近断层软岩巷道支护结构较为薄弱时，沿着掘进方向，巷道表面岩体径向位移将呈单峰分布且其最大值出现在距断层破碎带约3~6 m的位置；巷道穿过破碎带进入泥岩段时，其横断面岩体径向位移将与巷道推进距离呈线性关系；采用“锚索+锚杆+注浆+喷射混凝土”联合支护方案后，近断层软岩巷道顶板、底板、侧墙最大位移将分别比常规“锚杆索+金属网”支护方案减小84.9%、83.8%、89.2%。
- 断层破碎带 /
- 软岩巷道 /
- 蠕变 /
- 塑性区 /
- 支护方案 /
- 变形破坏特征
Abstract: In order to study the deformation and failure of soft rock roadway excavation near fault aging characteristics and determine the reasonable support mode, a ventilation roadway in Anli Coal Mine as the background, the displacement of surrounding rock mass in the process of the excavation and the changing regularity of plastic zone are analyzed with numerical simulation considering the creep property of mudstone, and the “anchor + bolt + shotcrete+ grouting” combination supporting scheme is proposed. The results show that: when the supporting structure of roadway in soft rock near the fault is relatively weak, along the excavation direction, the radial displacement of rock mass on the roadway surface presents a single peak distribution, and its maximum value occurs about 3 m to 6 m from the fault fractured zone; when the roadway passes through the fractured zone and enters the mudstone section, the radial displacement of the cross-sectional rock mass will be linearly related to the excavation distance of the roadway; when the combined support scheme of “anchor + bolt + shotcrete + grouting” is adopted, the maximum displacement of the roof, floor and side wall will be reduced by nearly 84.9%, 83.8% and 89.2%, respectively, compared with that of the support scheme of “anchor bolt + metal net”.
- fault fractured zone /
- soft rock roadway /
- creep /
- plastic zone /
- support plan /
- deformation-failure characteristics

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