CN110306522B - 一种爆炸挤淤填石下陷深度预测方法 - Google Patents
一种爆炸挤淤填石下陷深度预测方法 Download PDFInfo
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Abstract
Description
技术领域
本发明涉及基础建设领域,尤其涉及一种用于预测爆炸挤淤处理地基填石下陷深度的方法。
背景技术
爆炸挤淤是处理深厚软土,特别是水下软土地基较为经济和实用的方法。但对于深厚软土,特别是沿海港湾淤泥厚达30m,该项处理技术仍存在一些问题,比如深厚软土底部难以完全置换,即存在泥石混合层,或存在一定深度的未置换软土层,处理效果欠佳。对于泥石混合层,深度越大,填石的置换率越低,下部填石在自重作用下随着时间仍缓慢下陷,使得混合层的地基承载力不断提高。填石的最终下陷深度除了采用钻探和物探等方法确定外,目前尚无方式进行预测。
发明内容
本发明提供了一种爆炸挤淤填石下陷深度预测方法,其克服了背景技术中爆炸挤淤填石下陷深度预测所存在的不足。
本发明解决其技术问题的所采用的技术方案是:
一种爆炸挤淤填石下陷深度预测方法,包括:
步骤(1),获取填石平均等效粒径d50;
步骤(2),获取填石密度ρ0;
步骤(5),计算填石的下陷压力f;
其中,g为重力加速度;
步骤(6),计算地基不同深度处的下陷抗力pu;
pu=0.3ρ'gd50Nγ+0.4c'Nc
步骤(7),设深度zi,该深度zi位于埋设的炸药药包以下,若在该深度zi以上的下陷压力f均大于下陷抗力pu,即f>pu,而在该深度zi以下的下陷压力f不大于下陷抗力pu,即f≤pu,则深度zi为填石的最大下陷深度。
一实施例之中:该步骤(2)中,通过称重获得填石质量,通过将填石浸入水中获得体积,通过质量和体积计算填石密度。
一实施例之中:该步骤(3)中,地基在尚未爆炸挤淤施工前,在现场采用钻机取土样,将土样送回实验室进行土工试验,每隔预定深度测试一组土体性质,土体性质包括密度、粘聚力和内摩擦角,其中密度采用环刀法测试,粘聚力和内摩擦角采用直剪试验测试。
本技术方案与背景技术相比,它具有如下优点:
本技术方案能预测爆炸挤淤处理地基填石下陷深度,且预测简单、流程性强和结果可靠。
附图说明
下面结合附图和具体实施方式对本发明作进一步说明。
图1是具体实施方式的地基土密度ρ随着深度变化关系图。
图2是具体实施方式的地基土粘聚力c随着深度变化关系图。
图4是具体实施方式的地基土每个深度处的下陷压力和下陷抗力的关系图。
具体实施方式
一种爆炸挤淤泥石混合层填石下陷深度的预测方法,它包括:
步骤(1),获取填石的平均等效粒径d50。利用大型筛分实验仪器,如电动振动筛(型号BZS-500),对不少于预定重量,如20kg的典型填石样品进行筛分实验,根据筛分实验结果,绘制填石的颗粒累积级配曲线(粒径累积曲线),用于表示填石的粒径组成,以及求取平均粒径d50;根据曲线特征,确定填石的平均等效粒径d50,其单位为m。
步骤(2),获取填石的密度ρ0。利用称重和测体积的方法,得到填石密度,其中体积采用将填石浸入水中获得,根据水增大的体积得到密度ρ0,其单位为g/cm3。
地基在尚未爆炸挤淤施工前,在现场采用钻机取土样,将土样送回实验室进行土工试验,每隔10cm深度测试一组土体性质,包括密度、粘聚力和内摩擦角,其中密度采用环刀法测试,粘聚力和内摩擦角采用直剪试验测试。
步骤(5),计算填石的下陷压力f,单位为kPa。
其中,g为重力加速度。
步骤(6),计算地基不同深度处的下陷抗力pu,单位为kPa,由力学平衡原理得到。
pu=0.3ρ'gd50Nγ+0.4c'Nc
步骤(7),设深度zi,该深度zi位于埋设的炸药药包以下,若在该深度zi以上的下陷压力f均大于下陷抗力pu,即f>pu,而在该深度zi以下的下陷压力f不大于下陷抗力pu,即f≤pu,则深度zi为填石的最大下陷深度。
实施案例
福建省福州市连江县境内罗源湾围堤软基处理爆炸挤淤工程,泥面以上围堤高8m,顶宽9.4m,采用斜坡堤的结构型式。该围堤地质条件较差,存在厚达30m的淤泥层,地层状况为(以泥面为深度零点):①0~3m,淤泥混砂,灰黄色;②3~30m,淤泥,深灰色;③30~39m,粉质粘土,黄褐色,上部夹少量砂土;④39m以下,粉质粘土,夹碎石。
在爆炸挤淤过程中,炸药布设在堤头位置,布药宽度为42m,药包平均埋深为15m,药包间距为2m,单药包重量为36kg。
现场取典型填石样品50kg,进行大型筛分试验,得到填石的平均等效粒径d50为0.21m;对填石的密度进行测试,得到其密度ρ0为2.7g/cm3;利用钻机在爆炸挤淤实施前,现场取土样进行室内土工参数测试,由于本工程中药包埋深为15m,所以只统计出15m深度以下土体的密度ρ、粘聚力c和内摩擦角其中,15~17m深度范围内,密度ρ、粘聚力c和内摩擦角随着深度的变化关系分别如图1~图3所示。采用上述方法计算下陷压力及分别计算每个深度处的下陷抗力,结果如图4所示,可以看出,在深度16.8m处以上,下陷压力均大于下陷抗力,而在深度16.8m处以下,下陷压力均小于下陷抗力,填石在此深度处不会发生下陷,故该工程中,爆炸挤淤过后,填石仍会下陷1.8m,即最大下陷深度为16.8m。
以上所述,仅为本发明较佳实施例而已,故不能依此限定本发明实施的范围,即依本发明专利范围及说明书内容所作的等效变化与修饰,皆应仍属本发明涵盖的范围内。
Claims (4)
1.一种爆炸挤淤填石下陷深度预测方法,其特征在于:包括:
步骤(1),获取填石平均等效粒径d50;
步骤(2),获取填石密度ρ0;
步骤(5),计算填石的下陷压力f;
其中,g为重力加速度;
步骤(6),计算地基不同深度处的下陷抗力pu;
pu=0.3ρ'gd50Nγ+0.4c'Nc
步骤(7),设深度zi,该深度zi位于埋设的炸药药包以下,若在该深度zi以上的下陷压力f均大于下陷抗力pu,即f>pu,而在该深度zi以下的下陷压力f不大于下陷抗力pu,即f≤pu,则深度zi为填石的最大下陷深度。
2.根据权利要求1所述的一种爆炸挤淤填石下陷深度预测方法,其特征在于:该步骤(2)中,通过称重获得填石质量,通过将填石浸入水中获得体积,通过质量和体积计算填石密度。
3.根据权利要求1所述的一种爆炸挤淤填石下陷深度预测方法,其特征在于:该步骤(3)中,地基在尚未爆炸挤淤施工前,在现场采用钻机取土样,将土样送回实验室进行土工试验,每隔预定深度测试一组土体性质,土体性质包括密度、粘聚力和内摩擦角,其中密度采用环刀法测试,粘聚力和内摩擦角采用直剪试验测试。
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