CN114809038A - 一种露天矿锚索加固边坡稳定性确定方法 - Google Patents
一种露天矿锚索加固边坡稳定性确定方法 Download PDFInfo
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Abstract
本发明公开一种露天矿锚索加固边坡稳定性确定方法,首先将边坡滑体划分为两个区域,测量并计算位于下部区域的滑面底界面的长度和重量;然后确定锚索安装角度,并计算锚固力垂直弱层方向和沿着弱层方向的分力;接着利用两个方向上的分力计算锚固力使底界面的黏聚力、内摩擦系数增加的值,从而计算出锚索加固后底界面的等效黏聚力和等效内摩擦角;最后将等效黏聚力和等效内摩擦角带入剩余推力法中,得到锚索加固边坡稳定性系数。本发明的方法将莫尔库伦强度准则与剩余推力法相结合使用,准确快速的计算出锚索加固边坡稳定性系数,克服了现有方法计算锚索加固边坡稳定性系数流程繁琐、操作复杂等的不足。
Description
技术领域
本发明涉及露天开采技术领域,尤其涉及一种露天矿锚索加固边坡稳定性确定方法。
背景技术
滑坡是露天矿最为常见的地质灾害,预应力锚索加固是滑坡防治的重要措施之一。岩土工程界的专家与学者应用不同的理论及方法着力于研究预应力锚索的加固作用和机制,部分学者采用数值模拟手段分析了锚索加固边坡稳定性,但受岩土体变形参数不确定性的影响,该手段难以在工程中推广。因此,迫切需要寻求一种露天矿锚索加固边坡稳定性确定方法,填补边坡稳定性分析方法和滑坡防治方面的不足。
发明内容
针对上述现有技术的不足,本发明提供一种露天矿锚索加固边坡稳定性确定方法。
为解决上述技术问题,本发明所采取的技术方案是:一种露天矿锚索加固边坡稳定性确定方法,包括如下步骤:
步骤1:以边坡滑面的侧界面与弱层底界面的交点A为基准将边坡划分为两个区域,具体过程如下:
步骤1.1:采用刚体极限平衡法,确定边坡滑面的侧界面与弱层底界面的交点A;
步骤1.2:以A点向上作垂线与边坡线交于点B,AB线将滑体划分为两个区域。
步骤2:测量两个区域中位于下部区域的滑面底界面的长度L;
步骤3:计算两个区域中位于下部区域的滑体的重量W;
具体的计算公式如下:
步骤4:确定锚索安装角度ω;
步骤5:分别计算锚固力垂直弱层方向和沿着弱层方向的分力,具体过程如下:
计算锚固力垂直弱层方向的分力P1:P1=Psin(ω+α);
计算锚固力沿着弱层方向的分力P2=Pcos(ω+α);
其中,P为锚索的锚固力。
步骤6:根据莫尔库伦强度准则计算锚固力使底界面的黏聚力、内摩擦系数增加的值,具体过程如下:
其中,P1为锚索的锚固力垂直弱层方向的分力,P2为锚索的锚固力沿着弱层方向的分力。
进一步的,所述锚索加固后底界面的等效黏聚力cd的计算方法如下:
其中,c为弱层的黏聚力,P2为锚索的锚固力沿着弱层方向的分力。
其中,P1为锚索的锚固力垂直弱层方向的分力。
采用上述技术方案所产生的有益效果在于:本发明提供的方法是基于莫尔库伦强度准则,将锚固力垂直弱层方向的分力与沿着弱层方向的分力等效为弱层底界面的黏聚力与内摩擦角,再与成熟的剩余推力法相结合,能够准确快速的计算出锚索加固边坡稳定性系数。本方法克服了现有方法计算锚索加固边坡稳定性系数流程繁琐、操作复杂等的不足,同时能够为确定锚索数量提供理论支撑。
附图说明
图1为本发明实施例中露天矿锚索加固边坡稳定性确定方法的流程图;
图2为本发明实施例中边坡的滑面形态位置及区域划分的示意图;
图3为本发明实施例中锚固力为20000kN时计算的边坡稳定性系数结果示意图。
具体实施方式
下面结合附图和实施例,对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明,但不用来限制本发明的范围。
本实施例中。某露天煤矿最终开采深度为240m,最终开采煤层为4煤,设计边坡角为17°。边坡体岩层自下至上分别为4煤、泥岩、3煤、泥岩和第四系,在4煤底板处赋存弱层,其倾角约为5°,弱层的主要矿物成分为蒙脱石,具有遇水崩解的特性。露天矿设计的锚索锚固力为20000kN。根据以往的研究成果,确定的岩土体物理力学参数如表1所示。
表1岩土体力学计算指标表
如图1所示,本实施例中露天矿锚索加固边坡稳定性确定方法如下所述。
步骤1:以边坡滑面的侧界面与弱层底界面的交点A为基准将边坡划分为两个区域,具体过程如下:
步骤1.1:采用刚体极限平衡法,确定边坡滑面的侧界面与弱层底界面的交点A;
步骤1.2:以A点向上作垂线与边坡线交于点B,AB线将滑体划分为两个区域。
本实施例中,AB线将滑体划分为2个区域,如图2所示。
步骤2:测量两个区域中位于下部区域的滑面底界面的长度L;
本实施例中,测量两个区域中位于下部区域的滑面底界面的长度L=635.21m,如图2所示。
步骤3:计算两个区域中位于下部区域的滑体的重量W;
具体的计算公式如下:
本实施例中,计算两个区域中位于下部区域的滑体的重量:
W=16.20×(635.21cos5°)2·(tan17°-tan5°)/2=708839kN
步骤4:确定锚索安装角度ω;
本实施例中,确定的锚索安装角度ω=25°。
步骤5:分别计算锚固力垂直弱层方向和沿着弱层方向的分力,具体过程如下:
计算锚固力垂直弱层方向的分力P1:P1=Psin(ω+α);
计算锚固力沿着弱层方向的分力P2=Pcos(ω+α);
其中,P为锚索的锚固力。
本实施例中,锚索锚固力为P=20000kN,计算锚固力垂直弱层方向的分力P1=Psin(ω+α)=10000kN,锚固力沿着弱层方向的分力P2=Pcos(ω+α)=17320.50kN,如图3所示。
步骤6:根据莫尔库伦强度准则计算锚固力使底界面的黏聚力、内摩擦系数增加的值,具体过程如下:
进一步的,所述锚索加固后底界面的等效黏聚力cd的计算方法如下:
其中,c为弱层的黏聚力,P2为锚索的锚固力沿着弱层方向的分力。
其中,P1为锚索的锚固力垂直弱层方向的分力。
Claims (8)
2.根据权利要求1所述的露天矿锚索加固边坡稳定性确定方法,其特征在于,所述步骤1的过程如下:
步骤1.1:采用刚体极限平衡法,确定边坡滑面的侧界面与弱层底界面的交点A;
步骤1.2:以A点向上作垂线与边坡线交于点B,AB线将滑体划分为两个区域。
5.根据权利要求1所述的露天矿锚索加固边坡稳定性确定方法,其特征在于,所述步骤5的具体过程如下:
计算锚固力垂直弱层方向的分力P1:P1=Psin(ω+α);
计算锚固力沿着弱层方向的分力P2=Pcos(ω+α);
其中,P为锚索的锚固力。
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CN111794253A (zh) * | 2020-07-20 | 2020-10-20 | 卢金 | 一种预应力锚索加固破碎岩体高边坡的方法 |
CN112287578A (zh) * | 2020-10-22 | 2021-01-29 | 辽宁工程技术大学 | 一种端帮开采条件下边坡稳定性计算方法 |
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Patent Citations (7)
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US20030082014A1 (en) * | 2001-08-30 | 2003-05-01 | Soo-Yong Kang | Method for reinforcing slope reverse analysis technique |
CN101814104A (zh) * | 2010-04-07 | 2010-08-25 | 武汉大学 | 一种岩质边坡加固的锚固洞结构设计方法 |
CN103488829A (zh) * | 2013-09-16 | 2014-01-01 | 伍法权 | 一种边坡锚固布局方法 |
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CN112287578A (zh) * | 2020-10-22 | 2021-01-29 | 辽宁工程技术大学 | 一种端帮开采条件下边坡稳定性计算方法 |
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