CN111894675A - 一种地铁隧道塌方推管法抢险推力预测方法 - Google Patents
一种地铁隧道塌方推管法抢险推力预测方法 Download PDFInfo
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- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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Abstract
Description
技术领域
本发明涉及基础建设领域,具体是指一种用于地铁隧道塌方时采用推管法抢险时推管推力的预测方法。
背景技术
隧道在开挖施工过程中,由于种种原因,比如地质状态、受力状态、地下水变化、不适当的设计或不适当的施工方法等,都可能引起隧道塌方。隧道一旦发生塌方,对里面施工人员的安全造成极大威胁。因此,在隧道塌方区实施快速救援十分重要。在各种救援方法中,推管法是较好的方法之一,该法利用推力将管道强行顶入到塌方体中,并穿过塌方体,通过管道将空气和抢险物品输送到塌方被困区,给被困人员以物资给养。推管法的推力一般采用千斤顶或铲车等工具,千斤顶需要反力支撑,反力和推力是一对作用力与反作用力,在实施推管法时,明确其推力大小,对于施加反力结构具有重要参考意义。然而,迄今为止,推力大小或反力大小均基于工程经验,尚未见到有关隧道抢险推管法推力的理论预测方法,有鉴于此,本发明提出一种推管法推力大小的预测方法,具有结构简单、流程性强和结果可靠的优点。
发明内容
本发明的目的在于提供一种地铁隧道塌方推管法抢险推力预测方法。
为实现上述目的,本发明的技术方案是:一种地铁隧道塌方推管法抢险推力预测方法,具体步骤如下:
(1)确定塌方体的高度H、重度γ。
根据隧道不良地质体的高度H0,乘以岩土体松散系数1.1~1.3,得到塌方体的高度H,即H=(1.1~1.3)H0,或根据物探、钻探方法或估计法在地面上对塌方体进行竖直勘探,测得塌方体的高度H;在塌方体内取典型土样,利用环刀法测得其密度,然后乘以重力加速度得到其重度γ。
(2)确定推管中心轴线离隧道底部的距离H1。
为方便施工,通常H1位于1.0~3.0m之间。
(3)确定推管中心轴线处滑塌体的水平长度L。
根据物探、钻探方法或估计法确定出推管中心轴线处滑塌体的水平长度L。
(4)确定推管的常规段外径d1、扩大段外径d2和锥头外径D,以及单根推管的常规段长度L1和扩大段长度L2。
这些数据均由对施工选择的推管进行测量得到。
(6)确定塌方体与推管外壁之间的界面摩擦力τ。
(7)确定水平长度L范围内的推管根数m和完整根数n。
其中,int为取整数函数。
(8)确定水平长度L范围内的非完整推管的常规段长度L3和扩大头段长度L4。
若(m-n)(L1+L2)<L1,则L3=(m-n)(L1+L2),L4=0;否则,L3=L1,L4=(m-n)(L1+L2)-L1。
(9)确定常规段所需的推力T1、扩大段所需的推力T2和锥头所需的推力T3。
T1=πd1τnL1,
T2=πd2τnL2,
(10)确定推管所需的总推力T。
T=T1+T2+T3。
本发明的有益效果:本发明实施后,能够待地铁隧道发生塌方时,对利用推管法进行抢险时的推力进行预测,预测方法较为简单、结果可靠,以便合理选用推力设备,为隧道抢险提供技术支持。
具体实施方式
实施例
某隧道经过侵入接触带,由于围岩性质较差,地下水位较高,遇到塌方问题,内有3人被困。决定采用推管法进行抢险,采用本发明的预测方法对推管所需的推力进行预测。经过物探方法,确定出隧道不良地质体的高度H0为22.0m,乘以岩土体松散系数1.2,根据公式H=(1.1~1.3)H0,得到塌方体的高度H为26.4m;在塌方体内取典型土样,利用环刀法测得其密度为1.65g/cm3,然后乘以重力加速度得到其重度,γ为16.5kN/m3;根据施工经验,确定出推管中心轴线离隧道底部的距离H1为1.5m;根据物探方法确定出推管中心轴线处滑塌体的水平长度L为14.8m;对施工选择的推管进行测量,得到推管的常规段外径d1为0.30m、扩大段外径d2为0.35m和锥头外径D为0.35m,以及单根推管的常规段长度L1为1.8m和扩大段长度L2为0.2m;在塌方体上取典型土样,运回实验室进行不固结快剪试验,测得岩土体的粘聚力c为3.7kPa、内摩擦角为12°;根据进一步计算得到塌方体与推管外壁之间的界面摩擦力τ为87.3kPa;根据经计算,水平长度L范围内的推管根数m为7.8,完整根数n为7.0;进一步,(m-n)(L1+L2)=1.6m<L1=1.8m水平长度L范围内的非完整推管的常规段长度L3为(m-n)(L1+L2)=1.6m,扩大头段长度L4为0;进一步,根据T1=πd1τnL1计算得到常规段所需的推力T1为1167.8kN,根据T2=πd2τnL2扩大段所需的推力T2为134.3kN,根据锥头所需的推力T3为60.9kN;最后计算得到推管所需的总推力T为1363.0kN。
Claims (2)
1.一种地铁隧道塌方推管法抢险推力预测方法,其特征在于,步骤如下:
(1)确定塌方体的高度H、重度γ,
根据隧道不良地质体的高度H0,乘以岩土体松散系数1.1~1.3,得到塌方体的高度H,即H=(1.1~1.3)H0;在塌方体内取典型土样,利用环刀法测得其密度,然后乘以重力加速度得到其重度γ;
(2)确定推管中心轴线离隧道底部的距离H1,
为方便施工,通常H1位于1.0~3.0m之间;
(3)确定推管中心轴线处滑塌体的水平长度L,
根据物探、钻探方法或估计法确定出推管中心轴线处滑塌体的水平长度L;
(4)确定推管的常规段外径d1、扩大段外径d2和锥头外径D,以及单根推管的常规段长度L1和扩大段长度L2,
这些数据均由对施工选择的推管进行测量得到;
(6)确定塌方体与推管外壁之间的界面摩擦力τ,
(7)确定水平长度L范围内的推管根数m和完整根数n,
其中,int为取整数函数;
(8)确定水平长度L范围内的非完整推管的常规段长度L3和扩大头段长度L4,
若(m-n)(L1+L2)<L1,则L3=(m-n)(L1+L2),L4=0;否则,L3=L1,L4=(m-n)(L1+L2)-L1;
(9)确定常规段所需的推力T1、扩大段所需的推力T2和锥头所需的推力T3,
T1=πd1τnL1,
T2=πd2τnL2,
(10)确定推管所需的总推力T;
T=T1+T2+T3。
2.根据权利要求1所述的一种地铁隧道塌方推管法抢险推力预测方法,其特征在于,塌方体的高度H还可以根据物探、钻探方法或估计法在地面上对塌方体进行竖直勘探测得。
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LU501206A LU501206B1 (en) | 2020-08-06 | 2021-07-30 | Method for predicting emergency-response pipe-pushing thrust for subway tunnel collapse |
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CN115859444A (zh) * | 2022-12-21 | 2023-03-28 | 交通运输部公路科学研究所 | 一种公路隧道崩塌预测方法 |
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CN102140928A (zh) * | 2010-02-03 | 2011-08-03 | 沈忠毅 | 隧道式井下事故逃生系统 |
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