CN1873108B - 湿陷性黄土地基密闭真空膜压力水固结法 - Google Patents

湿陷性黄土地基密闭真空膜压力水固结法 Download PDF

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CN1873108B
CN1873108B CN2006102006421A CN200610200642A CN1873108B CN 1873108 B CN1873108 B CN 1873108B CN 2006102006421 A CN2006102006421 A CN 2006102006421A CN 200610200642 A CN200610200642 A CN 200610200642A CN 1873108 B CN1873108 B CN 1873108B
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CN1873108A (zh
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常建华
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China Sixth Metallurgical Construction Co., Ltd.
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Guiyang Aluminum Magnesium Design and Research Institute Co Ltd
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Abstract

本发明公开了一种湿陷性黄土地基密闭真空膜压力水固结法,该方法是在需要施工的场地内布置浸水孔,孔中注满水后,用密封膜密封,抽真空,使土地固结的。本发明具有方法简单易行、实施成本低,可安全可靠且快速有效地消除湿陷性黄土的湿陷性,更具有工程实用性。

Description

湿陷性黄土地基密闭真空膜压力水固结法
技术领域
本发明涉及一种土地固结法,特别是一种湿陷性黄土地基密闭真空膜压力水固结法。
背景技术
我国黄土覆盖面积广大,许多地区属于湿陷性黄土。在湿陷性黄土地区进行工程建设,若对地基处理不当,极易造成工程事故。传统的处理方法一般有土垫层或灰土垫层换铺法,灰土或粘土挤密桩法,钢筋砼桩法等。这些方法都有其各自的局限性,有的方法不经济,有的方法甚至可靠性不高。如土垫层或灰土垫层换铺法只适用于不会出现区域性地下水位上升及建筑物荷载不大时的情况;灰土或粘土挤密桩法,其挤密作用有限,对原土体结构的破坏导致的裂缝渗水却很严重,可靠性很低;钢筋砼桩法经济性很差,且不适用于处理黄土覆盖深度较厚的地基。
发明内容
本发明的目的,是提供一种湿陷性黄土地基密闭真空膜压力水固结法。该方法简单易行、实施成本低,可安全可靠且快速有效地消除湿陷性黄土的湿陷性,更具有工程实用性。
本发明是这样实现的。湿陷性黄土地基密闭真空膜压力水固结的方法,按下述步骤进行固结:
a、在场地内布置浸水孔,浸水孔直径为200~350毫米,孔距为直径的5~8倍,孔深为准备处理的深度;
b、向浸水孔内注水,以水淹没浸水孔为准;
c、用密闭膜覆盖场地,四周密封,抽出密闭膜内的空气,抽气真空度为700~900毫米汞柱,保持1~4小时,并每隔30分钟测量一次真空度;
d、对场地湿陷性沉降量进行测量并记录,如不满足要求,重复上述步骤,直至沉降量满足要求。
上述的湿陷性黄土地基密闭真空膜压力水固结法中,所述的浸水孔直径为250~300毫米,孔距为直径的6~7倍;抽气真空度为750~850毫米汞柱。
上述的湿陷性黄土地基密闭真空膜压力水固结法中,所述的密闭膜应具有在大于1000毫米汞柱真空度下不破裂的强度和韧性。
与现有技术相比,本发明具有方法简单易行、实施成本低,可安全可靠且快速有效地消除湿陷性黄土的湿陷性,更具有工程实用性。
具体实施方式
实施例。湿陷性黄土地基密闭真空膜压力水固结法。在实施本方法前,应先判定场地是否属于湿陷性土质。如果属于湿陷性土质,则按照本方法进行处理。判定方法为,通过实验测定拟建场地土样的湿陷系数,若该系数大于0.015,则属于湿陷性土质。
具体实施时,按下述步骤进行固结;
a、在场地内布置浸水孔,浸水孔直径为250毫米,孔距为1.5米,孔深则根据湿陷性土层覆盖深度及准备处理的深度决定;
b、向场地中的浸水孔内放水,以水能淹没浸水孔为准;
c、用密闭膜覆盖须处理的场地,所使用的密闭膜应具有较好的韧性,并能保证密闭不透气;将密闭膜的周边挖沟埋膜,并用粘性土覆盖,以保证其密闭不漏气;用抽气设备(如真空泵)逐渐抽出密闭膜内的空气,并保证密闭膜下真空度较稳定地保持在800mmHg左右,并在密闭真空膜内均匀分布,保持1~4小时,并每隔30分钟测量一次真空度;
d、对场地湿陷性沉降量进行测量并记录。经一定时间的沉降固结,沉降量逐渐变小,并趋于稳定。通过测量,当其沉降量小于规定的量值时,即表明场地土已完成了固结作用,达到了工程场地的使用要求。如果测量结果没达到需要的沉降量或工程场地的使用要求,可以再次向浸水孔中注水,重复上述操作步骤,直到测量结果达到工程场地的使用。
本发明的固结原理是:湿陷性土质在自然状态下也会慢慢的自然沉降的,发生沉降的主要因素是地面上的水渗透所造成的,通常情况下,由于地面上不会经常积水,水也不会渗透到地下很深,所以自然沉降的速度很缓慢,随着时间的推移沉降量会越来越小,最终趋于稳定的,本方法的作用是在短时间内加速湿陷性土质的沉降速度,使其趋于稳定。具有方法是在需要快速沉降的工地打浸水孔,在孔中加水,加压,让水快速的渗透到地下的深层,加快了水在土体内的参透速度,使沉降加快,在短时间内在所需要的地层范围达到沉降的稳定状态。

Claims (3)

1.一种湿陷性黄土地基密闭真空膜压力水固结法,其特征在于:按下述步骤进行固结;
a、在场地内布置浸水孔,浸水孔直径为200~350毫米,孔距为直径的5~8倍,孔深为准备处理的深度;
b、向浸水孔内注水,以水淹没浸水孔为准;
c、用密闭膜覆盖场地,四周密封,抽出密闭膜内的空气,抽气真空度为700~900毫米汞柱,保持1~4小时,并每隔30分钟测量一次真空度;
d、对场地湿陷性沉降量进行测量并记录,如不满足要求,重复上述步骤,直至沉降量满足要求。
2.根据权利要求1所述的湿陷性黄土地基密闭真空膜压力水固结法,其特征在于:浸水孔直径为250~300毫米,孔距为直径的6~7倍;抽气真空度为750~850毫米汞柱。
3.根据权利要求1或2所述的湿陷性黄土地基密闭真空膜压力水固结法,其特征在于:所述的密闭膜应具有在大于1000毫米汞柱真空度下不破裂的强度和韧性。
CN2006102006421A 2006-06-30 2006-06-30 湿陷性黄土地基密闭真空膜压力水固结法 Expired - Fee Related CN1873108B (zh)

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CN102425149B (zh) * 2011-09-02 2013-11-06 中铁十七局集团第二工程有限公司 一种基于冲孔补水的强夯处理地基的方法
CN102425153A (zh) * 2011-12-20 2012-04-25 宁夏回族自治区电力设计院 湿陷性黄土场地浸水方法
CN105369797A (zh) * 2015-11-12 2016-03-02 江苏澄工科技有限公司 湿陷性黄土真空辐射固结法

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RU2059043C1 (ru) * 1991-12-06 1996-04-27 Осипов Виктор Иванович Способ замачивания массива лессового просадочного грунта
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Publication number Priority date Publication date Assignee Title
RU2059043C1 (ru) * 1991-12-06 1996-04-27 Осипов Виктор Иванович Способ замачивания массива лессового просадочного грунта
CN1084599A (zh) * 1993-02-06 1994-03-30 吴崇礼 一种排水桩及其排水施工方法
WO2000050696A1 (en) * 1999-02-25 2000-08-31 Menard Soltraitement An equipment and a method for partially drying a zone of ground containing a liquid

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