CN113945340B - 一种预测填土导致架空承台沉降诱发管线渗漏量的方法 - Google Patents
一种预测填土导致架空承台沉降诱发管线渗漏量的方法 Download PDFInfo
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Abstract
本发明涉及一种预测填土导致架空承台沉降诱发管线渗漏量的方法,解决现有技术中现场间接测量外,尚无可靠的理论方法进行预测的问题;其解决的技术方案是:步骤1:确定管线的内径D,河床承台两侧架空部分单段管线长度L1和L2:步骤2:确定承台处填土高度H0;步骤3:确定填土重度γ:步骤4:确定填土在承台处河床表面引起的竖向荷载P:P=γH0;步骤5:确定河床底部软土层厚度Z和软土的压缩模量Es:步骤6:确定承台位置处填土的等效宽度B:步骤7:计算承台由于填土荷载引起的下沉量S:步骤8:确定承台处两侧架空管线的转动倾角α1、α2:步骤9:确定渗漏通道的面积A:步骤10:确定管道内流体的流速v;步骤11:确定出管道的渗漏量Q:Q=vA;本发明可计算出渗漏量。
Description
技术领域
本发明涉及基础建设领域,特别是一种预测填土导致架空承台沉降诱发管线渗漏量的方法。
背景技术
承插式钢筋混凝土管道是一种常见的输水设备,当该类管线穿越河流时,通常采用承台对其进行架空,即承台架在两段管线的承插接口处。在城市建设过程中,经常遇到河谷填埋,堆土荷载压在下部承台基础上,加之河床底部往往存在一定厚度的软土,在填土荷载作用下,承台发生沉降,导致管线承插接口发生变形,插口下沉,接口脱开,导致输水渗漏;加上填土密实性较差,渗透系数较大,渗漏量往往较大。目前,对于这种情况下的渗漏量,除了现场间接测量外,尚无可靠的理论方法进行预测。
发明内容
针对上述情况,为解决现有技术中存在的问题,本发明之目的就是提供一种预测填土导致架空承台沉降诱发管线渗漏量的方法,解决现有技术中现场间接测量外,尚无可靠的理论方法进行预测的问题。
其解决的技术方案是:一种预测填土导致架空承台沉降诱发管线渗漏量的方法,所述的方法主要包括以下步骤:
步骤1:确定管线的内径D,河床承台两侧架空部分单段管线长度L1和L2:
根据管线设计方案,确定管线的内径D;根据管线设计方案和施工方案,确定两侧架空部分单段管线长度,分别表示为L1和L2;
步骤2:确定承台处填土高度H0;
步骤3:确定填土重度γ:
利用钻探取出的土样,运回实验室进行密度试验,测试出密度后,乘以重力加速度,得到其重度γ;
步骤4:确定填土在承台处河床表面引起的竖向荷载P:
P=γH0
步骤5:确定河床底部软土层厚度Z和软土的压缩模量Es:
利用上述钻探结果,确定软土层厚度Z;利用钻探取出的软土原状样品,运回实验室进行压缩固结试验,测试出其压缩模量Es;
步骤6:确定承台位置处填土的等效宽度B:
步骤7:计算承台由于填土荷载引起的下沉量S:
步骤8:确定承台处两侧架空管线的转动倾角α1、α2:
步骤9:确定渗漏通道的面积A:
步骤10:确定管道内流体的流速v:
根据管道的设计方案,确定出流速v;
步骤11:确定出管道的渗漏量Q:
Q=vA。
优选的,确定所述的填土高度H0时,在承台边缘1~2m位置处进行钻探取样。
优选的,确定所述的等效宽度B时,利用物探方法探测出承台位置处河床上方填土的横断面几何形状,在Auto-CAD里绘制出填土几何形状,利用Auto-CAD的面积查询功能,确定出横断面的面积A0,则B=A0/H0。
优选的,若B≥Z,则β=0.75;若B≤0.5Z,β=0.25;若0.5Z<B<Z时,则β在(0.25,0.75)之间线性插值。
本发明的工作原理是当河床上受到填土的竖向荷载后,河床发生沉降,相应河床处的管道承台基础也发生相应沉降,而河床两侧处的承台基础下方没有软土存在,且无填土存在,故不会发生沉降;因此,河床处承台发生沉降后,上方架设的管道承插口发生旋转倾斜,下口打开,出现渗漏,水流流速越高,开口面积越大,则渗漏量越大。
附图说明
图1为本发明测量过程中的主视剖面图。
具体实施方式
以下结合附图对本发明的具体实施方式做进一步详细说明。
我国东南沿海某地区建有一座火力发电站,该火力发电站通过一输水管线进行输水;该管线为承插式钢筋混凝土管,管道横穿河流,在河床中间建有一承台;后来由于城市建设开发需要,地面进行整平,河流被填土覆盖。由于填土荷载作用,导致该管道出现渗漏,为了确定渗漏量,采用本发明的方法对其进行预测。
根据管线设计方案,确定管线的内径D为1.0m,根据管线设计方案和施工方案,确定河床承台两侧架空部分单段管线长度L1为5.5m、L2为5.0m;在承台边缘1~2m位置处进行钻探取样,确定填土高度H0为4.1m;利用钻探取出的土样,运回实验室进行密度试验,测试出密度后,乘以重力加速度,得到其重度γ为17.7kN/m3;确定填土在承台处河床表面引起的竖向荷载P为72.57kPa;利用上述钻探结果,确定软土层厚度Z为7.2m;利用钻探取出的软土原状样品,运回实验室进行压缩固结试验,测试出其压缩模量Es为1.74MPa;利用物探方法探测出承台位置处填土的横断面几何形状,在Auto-CAD里绘制出填土几何形状,利用Auto-CAD的面积查询功能,确定出横断面的面积A0为43.87m2,则承台位置处填土的等效宽度B为10.7m;由于B>Z,故β=0.75,则承台由于填土荷载引起的下沉量S为0.225m;进一步确定承台处两侧架空管线的转动倾角α1为2.34°、α2为2.58°;确定渗漏通道的面积A为0.135m2;根据管道的设计方案,确定出流速v为0.20m/s;确定出管道的渗漏量Q为0.027m3/s。
Claims (3)
1.一种预测填土导致架空承台沉降诱发管线渗漏量的方法,其特征在于,包括以下步骤:
步骤1:确定管线的内径D,河床承台两侧架空部分单段管线长度L1和L2:
根据管线设计方案,确定管线的内径D;根据管线设计方案和施工方案,确定两侧架空部分单段管线长度,分别表示为L1和L2;
步骤2:确定承台处填土高度H0;
步骤3:确定填土重度γ:
利用钻探取出的土样,运回实验室进行密度试验,测试出密度后,乘以重力加速度,得到其重度γ;
步骤4:确定填土在承台处河床表面引起的竖向荷载P:
P=γH0
步骤5:确定河床底部软土层厚度Z和软土的压缩模量Es:
利用上述钻探结果,确定软土层厚度Z;利用钻探取出的软土原状样品,运回实验室进行压缩固结试验,测试出其压缩模量Es;
步骤6:确定承台位置处填土的等效宽度B:
步骤7:计算承台由于填土荷载引起的下沉量S:
若B≥Z,则β=0.75;若B≤0.5Z,β=0.25;若0.5Z<B<Z时,则β在(0.25,0.75)之间线性插值;
步骤8:确定承台处两侧架空管线的转动倾角α1、α2:
步骤9:确定渗漏通道的面积A:
步骤10:确定管道内流体的流速v:
根据管道的设计方案,确定出流速v;
步骤11:确定出管道的渗漏量Q:
Q=vA。
2.根据权利要求1所述的一种预测填土导致架空承台沉降诱发管线渗漏量的方法,其特征在于,确定所述的填土高度H0时,在承台边缘1~2m位置处进行钻探取样。
3.根据权利要求1所述的一种预测填土导致架空承台沉降诱发管线渗漏量的方法,其特征在于,确定所述的等效宽度B时,利用物探方法探测出承台位置处河床上方填土的横断面几何形状,在Auto-CAD里绘制出填土几何形状,利用Auto-CAD的面积查询功能,确定出横断面的面积A0,则B=A0/H0。
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