CN112028594A - 产物稳定的盾构同步注浆用水泥-水玻璃双液注浆料 - Google Patents
产物稳定的盾构同步注浆用水泥-水玻璃双液注浆料 Download PDFInfo
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- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
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- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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Abstract
本发明公开了一种产物稳定的盾构同步注浆用水泥‑水玻璃双液注浆料,由A液和B液组成,其特征在于:所述的A液的组分为水泥、粉煤灰、缓凝剂和水;其中,所述的水泥为42.5级的普通硅酸盐水泥,粉煤灰为Ⅱ级粉煤灰,缓凝剂为纯度≥99.0%、PH值4.0~4.5,澄清度≤3的磷酸二氢铵;所述的B液为波美度为30‑40°,模数为3.1~3.3的水玻璃。该种注浆料用于盾构同步注浆,其胶凝时间短、管片的抗浮性能好;且其反应产物的稳定性好,在实际工程的自然条件下不易崩解、开裂,体积收缩率小,抗压强度不劣化,形成的管片衬砌结构的强度高、防水性能好。
Description
技术领域
本发明涉及一种盾构同步注浆用的注浆材料。
技术背景
在盾构隧道的掘进过程中,随着盾构机的推进,在盾构机的盾尾完成拼接的管片,会脱离盾尾进入土体;由于盾构机的外径大于管片环的外径,脱离盾尾的管片和土体之间会出现环行的盾构间隙;需要在盾构机推进过程中,不间断地从盾尾直接向壁后注浆,以填充盾构间隙。盾构机的推进速度与注浆速度要匹配,推进一环就必须同时完成一环的注浆,故叫同步注浆。盾构同步注浆的目的是为了尽快填充环形间隙,使管片与管片外的隧道土层紧密结合,以保证盾构隧道的结构稳固、可靠。
目前,盾构同步注浆用的注浆材料主要是水泥浆。同步注浆时,水泥浆的凝结时间长且难以控制;加之,注浆时土层存在流动的地下水,使得注浆的结石率(浆液的最初体积与凝固后结石体积之比)低,管片与隧道土层间的填筑浆液不饱满。管片外侧与土层间的间隙不能够及时有效地填充,且注浆材料不能及时胶凝,导致浆液下沉,管片上方出现大的空闲空间;管片下方浆液集中、挤压,产生上浮力,使管片形成的盾构衬砌结构长时间处于上浮状态。管片的上浮会产生多种危害:一是造成盾构隧道衬砌的内轮廓超出规定的限界,必须进行处理。二是在盾构的端面产生剪切力,造成管片的错台、开裂、破损和漏水,降低管片的抗压强度和抗渗压力。
为了消除管片上浮给盾构隧道造成的危害,就需要调控好同步注浆用的注浆料的胶凝特性,缩短其胶凝时间;在管片脱出盾尾后,未发生上浮之前,消除浆液产生的浮力。采用水泥-水玻璃双液浆料进行同步注浆,其胶凝时间可调、早期强度大,具有用于解决盾构隧道抗浮问题的潜力。但现有的水泥-水玻璃双液浆,其结石体只有在95%高湿度下,才具有较好的长期稳定性,在湿度低于70%的实际工程现场的的自然条件下,其产物(结石体)的结石率较低、且稳定性差;容易出现外观开裂、崩解和裂纹,抗压强度显著衰减。总之,现有的水泥-水玻璃双液浆用于盾构隧道同步注浆,其产物(结石体)稳定性差,会危及管片衬砌结构的安全和防水性能,从而限制了水泥-水玻璃双液浆在盾构同步注浆中的应用。
发明内容
本发明的发明目的是提供一种产物稳定的盾构同步注浆用水泥-水玻璃双液注浆料,该种注浆料用于盾构同步注浆,其胶凝时间短、管片的抗浮性能好;且其反应产物的稳定性好,在实际工程的自然条件下不易崩解、开裂,体积收缩率小,抗压强度不劣化,形成的管片衬砌结构的强度高、防水性能好。
本发明实现其发明目的所采用的技术方案是,一种产物稳定的盾构同步注浆用水泥-水玻璃双液注浆料,由A液和B液组成,其特征在于:
所述的A液的组分为水泥、粉煤灰、缓凝剂和水;其中,所述的水泥为42.5级的普通硅酸盐水泥,粉煤灰为Ⅱ级粉煤灰,缓凝剂为纯度≥99.0%、PH值4.0~4.5,澄清度≤3的磷酸二氢铵;
所述的B液为波美度为30-40°,模数为3.1~3.3的水玻璃。
进一步,本发明的双液注浆料中各组分的重量配比为:水泥252~357份、粉煤灰26~142份、缓凝剂0.5-3.5份,水636~752份;水玻璃230~395份。
本发明的双液注浆料的配制和使用方法如下:
按所述配比量取水玻璃得到B液。同时按所述配比量取A液的各组分,然后将水泥、粉煤灰投入水中,搅拌均匀;再投入缓凝剂、并搅拌,得到A液。使用时,将A液倒入B液并拌匀,即得双液注浆料。随即在盾构隧道的管片安装过程需要同步注浆时,用其注浆即可。
与现有技术相比,本发明的有益效果是:
一、本发明的双液注浆料,在水泥浆体中加入了Ⅱ级粉煤灰,Ⅱ级粉煤灰的0.045mm方孔筛通过率为80%以上。这种细粒度的细粉煤灰,由于其独特的外观形貌、内在结构、表面活性、颗粒级配的物理特性,能增强浆液的流变性及其在注浆时的扩散半径,使水泥浆体中的颗粒分散程度加大,扩大水泥水化作用的空间和水化产物的生成场所,有利于能够形成更加均匀、结合牢固的反应产物(结石体);进而减低了析水率和体积收缩率,提高了中后期抗压强度;明显减轻或避免了结石体的外观开裂、崩解和裂纹,抗压强度衰减的发生,提高了产物的稳定性。
二、粉煤灰中含有SiO2、Al2O3等活性成分,这些活性成分会与水泥水化产物中的大量Ca(OH)2反应,发生火山灰反应,生成C-S-H水化硅酸钙凝胶和A-S-H水化铝酸钙凝胶;这既增大了结石体的强度,又减小了结石体的中的微孔结构,结石体的渗透率下降,减小外部有害化学离子的侵入危害;同时,火山灰反应还消耗掉水泥水化产生的氢氧化钙,减小了氢氧化钙浸出的危险。总之,活性化学反应也明显减低了产物的析水率和体积收缩率,提高了中后期抗压强度;提高了产物的稳定性。
三、粉煤灰的活性化学反应较水泥水化更慢,早期的粉煤灰的微细颗粒均匀分布于水泥浆体的基相之中,还起到细微的集料作用,使得浆液体系内细颗粒的比例增大,混合料的内聚力增大,减小了浆液的离析和泌水,也减小了结石体的体积收缩;进一步减低了产物的析水率和体积收缩率,提高了结石体的抗压强度、提高了产物的稳定性。
总之,本发明在通过特定配比的水玻璃、缓凝剂实现胶凝时间的调节,而使管片具有良好的抗浮性能的基础上;再通过掺入粉煤灰这种具有填充作用、粒径更小的活性材料替代部分水泥,增大了注浆材料体系内胶凝物质的分散程度,形成了更多、更牢固的胶凝物质,减少了结石体内的微孔结构,降低了结石体的体积收缩,抑制了结石体的开裂、崩解,强度劣化;使得在实际工程的自然湿度条件下,产物的长期稳定性好,结石体不易开裂、崩解,强度不会劣化。
下面结合具体实施方式对本发明做进一步的详细说明。
具体实施方式
实施例一
本发明的一种具体实施方式是,一种产物稳定的盾构同步注浆用水泥-水玻璃双液注浆料,由A液和B液组成,其特征在于:
所述的A液的组分为水泥、粉煤灰、缓凝剂和水;其中,所述的水泥为42.5级的普通硅酸盐水泥,粉煤灰为Ⅱ级粉煤灰,缓凝剂为纯度=99.0%、PH值=4.0,澄清度=3的磷酸二氢铵;
所述的B液为波美度为30°,模数为3.1的水玻璃。
本例的各组分的重量配比为:水泥252份、粉煤灰29份、缓凝剂1.9份,水675份;水玻璃319份。
为验证本发明的盾构同步注浆用水泥-水玻璃双液注浆料的产物稳定性,配制出不添加粉煤灰的相应对照例。并对实施例和对照例在湿度60%的自然条件下,进行性能测试和产物稳定性观察。
对照例一
对照例一与实施例一不同的仅仅是:A液中不含有粉煤灰。
实施例一和对照例一在自然温、湿度条件下的性能测试和产物稳定性观察结果如下。
表1实施例一和对照例一在自然温、湿度条件下的产物性能
表1的性能测试表明,实施例一的析水率、7d抗压强度、28d抗压强度、28d强度损失率、14d体积收缩率远优于对照例一;
产物稳定性观察结果表明:在注浆后28天后,实施例一的结石体未出现开裂、崩解,而对照例一在3天就出现了开裂、收缩、崩解等现象。
可见,实施例一的产物稳定性远优于对照例一。
实施例二
本例的组分与实施例一的基本相同,不同的仅仅是:
缓凝剂为纯度=99.5%、PH值=4.5,澄清度=2.5的磷酸二氢铵;
波美度为40°,模数为3.3的水玻璃;
各组分的重量配比为:水泥263份、粉煤灰66份、缓凝剂2.6份,水659份;水玻璃319份。
对照例二
对照例二与实施例二不同的仅仅是:A液中不含有粉煤灰。
实施例二和对照例二在自然温湿度条件下的性能测试和产物稳定性观察结果如下。
表2实施例二和对照例二在自然温湿度条件下的的产物性能
表2的性能测试表明,实施例二的析水率、7d抗压强度、28d抗压强度、28d强度损失率、14d体积收缩率远优于对照例二;
产物稳定性观察结果表明:在注浆后28天后,实施例二的结石体未出现开裂、崩解,而对照例二在3天就出现了开裂、收缩、崩解等现象。
可见,实施例二的产物稳定性也远优于对照例二。
实施例三
本例的组分与实施例一基本相同,不同的仅仅是:
缓凝剂为纯度=99.8%、PH值=4.2,澄清度=2.0的磷酸二氢铵;
波美度为35°,模数为3.2的水玻璃;
各组分的重量配比为:水泥278份、粉煤灰120份、缓凝剂2.8份,水636份;水玻璃319份。
对照例三
对照例三与实施例三不同的仅仅是:A液中不含有粉煤灰。
实施例三和对照例三在自然温湿度条件下的性能测试和产物稳定性观察结果如下。
表3实施例三和对照例三的产物性能
表3的性能测试表明,实施例三的析水率、7d抗压强度、28d抗压强度、28d强度损失率、14d体积收缩率远优于对照例三;
产物稳定性观察结果表明:在注浆后28天后,实施例三的结石体未出现开裂、崩解,而对照例三在3天就出现了开裂、收缩、崩解等现象。
可见,实施例三的产物稳定性也远优于对照例三。
本发明中的Ⅱ级粉煤灰是指0.045mm方孔筛筛余量不大于30%、需水量比不大于105%、烧失量不大于8%、含水量不大于1%的粉煤灰。
实施例四
本例的组分与实施例一基本相同,不同的仅仅是:
缓凝剂为纯度=99.9%、PH值=4.2,澄清度=1.5的磷酸二氢铵;
波美度为36°,模数为3.1的水玻璃;
各组分的重量配比为:水泥357份、粉煤灰26份、缓凝剂0.5份,水636份;水玻璃230份。
实施例五
本例的组分与实施例一基本相同,不同的仅仅是:
缓凝剂为纯度=99.7%、PH值=4.3,澄清度=1.0的磷酸二氢铵;
波美度为38°,模数为3.3的水玻璃;
各组分的重量配比为:水泥300份、粉煤灰142份、缓凝剂3.5份,水752份;水玻璃395份。
Claims (2)
1.一种产物稳定的盾构同步注浆用水泥-水玻璃双液注浆料,由A液和B液组成,其特征在于:
所述的A液的组分为水泥、粉煤灰、缓凝剂和水;其中,所述的水泥为42.5级的普通硅酸盐水泥,粉煤灰为Ⅱ级粉煤灰,缓凝剂为纯度≥99.0%、PH值4.0~4.5,澄清度≤3的磷酸二氢铵;
所述的B液为波美度为30-40°,模数为3.1~3.3的水玻璃。
2.根据权利要求1所述的一种盾构同步注浆用的水泥-水玻璃双液注浆料,其特征在于:
所述的各组分的重量配比为:水泥252~357份、粉煤灰26~142份、缓凝剂0.5-3.5份,水636~752份;水玻璃230~395份。
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