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Bishop法在露天煤矿边坡角确定中的实践与应用
Practice and Application of Bishop Method in Determining Slope Angle of Open-Pit Coal Mines
DOI: 10.12677/ME.2024.121011, PDF, HTML, XML, 下载: 114  浏览: 523

Abstract: In response to the technical difficulties in determining the slope angle of Almale Coal Mine in Yitai Yili Mining Co., Ltd., a new method called Bishop method was adopted to determine the slope angle of open-pit coal mines. The usage conditions and precautions of the new method using Bishop method to determine the slope angle of open-pit coal mines were explained. The application re-search was conducted in Almale Coal Mine in Yitai Yili Mining Co., Ltd., and good application results were achieved, saving costs. It ensures the safe and efficient production of Almale Coal Mine and has a wide range of application value.

1. 引言

2. 矿井概况

3. 存在的问题

4. Bishop法在露天煤矿边坡角确定中的实践与应用

4.1. 计算方法

(1) 滑坡模式

(2) 计算方法

Figure 1. Schematic diagram of circular arc failure

$F=\frac{\sum X/\left(1+Y/F\right)}{\sum Z+Q}$

$Y=tg{\alpha }_{i}\cdot tg{\varphi }_{i}$

$Z=r{h}_{i}\Delta {X}_{i}\cdot \mathrm{sin}{\alpha }_{i}$

$Q=\frac{1}{2}{r}_{w}\cdot {Z}^{2}\cdot a/R$

(1) ${\sigma }^{\prime }=\frac{r{h}_{i}-{r}_{w}\cdot {h}_{wi}-{c}^{\prime }tg{\alpha }_{i}/F}{1+Y/F}〉0$

(2) $\left(1+Y/F\right)\mathrm{cos}{\alpha }_{i}〉0.2$

F——稳定系数；

Ci——瞬时粘结力；

r——岩石容重；

hi——条块高度；

rw——水容重；

hwi——水位高；

${\varphi }_{i}$ ——瞬时内摩擦角；

ΔXi——条块宽度；

αi——条块底面倾角；

Q——张裂隙水的水平作用力；

σ'——有效正压力。

(3) 求最危险滑落面方法

4.2. 采掘场边坡地层抗剪强度有关指标的选取

(1) 岩块物理力学指标选取

Table 1. Table of strength of different rock masses

4.3. 边坡安全储备系数的确定

《煤炭工业露天矿设计规范》6.0.8条明确规定了边坡稳定性安全系数Fs的选用范围如表2所示。

Table 2. Selection of slope safety factors Fs

4.4. 计算剖面的选取

Table 3. Summary table of using previous engineering geological data for each engineering geological section model

4.5. 最终边坡角的确定

(1) 南帮边坡(非工作帮)

Figure 2. Stability calculation results of the southern slope

(2) 北帮边坡(最终帮)

Figure 3. Stability calculation results of the northern slope

(3) 西帮边坡(端帮)

Figure 4. Stability calculation results of the western slope

(4) 东帮边坡(端帮)

Figure 5. Stability calculation results of dongbang slope

Figure 6. Calculation results of slope stability at maximum mining height

Table 4. Final slope angle

5. 结语

(1) 运用Bishop法来确定露天煤矿的边坡角对于煤矿安全生产具有非常重要的理论和现实指导意义；

(2) 煤矿在生产中应加强工程地质勘探工作，探明影响露天煤矿边坡稳定的软弱层的分布状态及其物理力学性质，以便作进一步分析研究，随时修正边坡角，使得边坡设计更加符合实际；

(3) 水作用下的边坡破坏机制复杂，掌握其力学特性是制定合理且完备的疏干排水方案的前提。矿田内煤层顶底板岩石力学强度低，稳固性差，岩石遇水极易软化，在开采过程中应在根据实际情况增加水文地质勘察工作并采取有效的防治水措施，防止水对边坡稳定性的影响。

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