CN104481564B - 一种变形自检测的碳纤维树脂锚杆及其制备方法和应用 - Google Patents
一种变形自检测的碳纤维树脂锚杆及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开了一种变形自检测的碳纤维树脂锚杆及其变形检测方法。该锚杆主要由玻璃纤维、树脂及树脂锚固剂组成,其中所述的玻璃纤维占原料重量百分比为70%‑85%,所述树脂锚固剂由不饱和聚酯树脂、大理石粉、促进剂、碳纤维组成;所述不饱和聚酯树脂、大理石粉、促进剂、碳纤维的质量比为80~90:4~8:3~5:6,所述碳纤维的长度为4mm~6mm,所述锚杆的归一化电阻率与应变关系式为ΔR/R=0.142e1.315ε,其中ΔR/R0叫做归一化电阻率,ε为应变值。避免了因为外部传感器的植入而引起的变形测试精度下降以及传感器耐久性不满足要求的现象,特别适用于全寿命周期内加固体的变形监测与安全预警。
Description
技术领域
本发明属于土木工程领域,特别涉及一种变形自检测的碳纤维树脂锚杆及其变形检测方法。
背景技术
锚杆,按材质分为钢丝绳锚杆、普通钢筋锚杆、螺纹钢锚杆、玻璃钢锚杆、木锚杆和竹锚杆等类型,广泛的应用于矿山、隧道、道路等工程施工支护。锚杆在工程应用中具有悬吊作用、挤压加固作用、组合梁作用,能够限制岩土体脱离原体,增加岩土体的粘聚力,同时支护成本低、施工迅速。然而,目前使用的锚杆只能起到单一的锚固作用,对加固体的变形信息的检测则需采用其他设备,增加了检测的难度和成本,因此有必要对加固体变形的检测进行更加深入的研究。
发明内容
鉴于此,本发明提出了一种变形自检测的碳纤维树脂锚杆,该类型的树脂锚杆利用导电复合材料的拉敏特性,通过监测锚杆的电阻变化以获取其自身变形信息而无需在加固体内安装传感设备,避免了因为外部传感器的植入而引起的变形测试精度下降以及传感器耐久性不满足要求的现象,特别适用于全寿命周期内加固体的变形监测与安全预警。
为实现上述目的,本发明采用下述技术方案:
一种变形自检测的碳纤维树脂锚杆,所述原料主要由玻璃纤维、树脂及树脂锚固剂组成,其中所述的玻璃纤维占原料重量百分比为70%-85%,所述树脂锚固剂由不饱和聚酯树脂、大理石粉、促进剂、碳纤维组成;
所述不饱和聚酯树脂、大理石粉、促进剂、碳纤维的质量比为80~90:4~8:3~5:6。
优选的是,所述碳纤维的长度为4mm~6mm。
本发明还提供了上述的变形自检测的碳纤维树脂锚杆的制备方法,包括如下步骤:
1)将碳纤维用丙酮浸泡,洗涤,烘干后,与不饱和聚酯树脂、大理石粉、促进剂混合,制成黏稠状粘结材料,得树脂锚固剂;
2)取螺纹玻璃钢锚杆作为锚杆杆体,在底部和上部分别粘贴导电片和导线,引出导线,用上述的树脂锚固剂对锚杆进行全长锚固,固化后,加装托盘和螺母,即得变形自检测的碳纤维树脂锚杆碳纤维树脂锚杆;
所述不饱和聚酯树脂、大理石粉、促进剂、碳纤维的质量比为80~90:4~8:3~5:6。
上述的锚杆在全寿命周期内加固体的变形监测与安全预警发面的应用。
本发明的设计思路是(1)导电高分子复合材料已在能源、光电子器件、信息、传感器、分子导线以及电磁屏蔽、金属防腐和隐身技术等领域得到了广泛应用,其中填充复合型导电高分子材料是应用最广泛的导电复合材料,它是在基体聚合物中加入碳纤维、炭黑、石墨或碳纳米管等导电填料复合而成。导电高分子复合材料的导电行为呈现出现行的渗滤现象,如图1所示。当填料含量增加到某一阈值时,在某一区域内复合材料电阻率急剧下降,这一区域被称为渗滤区域。机敏材料具有感知和驱动功能,某些导电高分子复合材料也具有机敏性,经过特殊设计后表现出一些特殊效应,如拉敏效应。拉敏效应是在外部拉力作用下复合材料导电性发生转变的过程(低阻态→高阻态)。拉敏效应的出现是由于当复合材料变形超过某一临界值时,导电通路被部分破坏从而导致复合材料高阻态的发生。
(2)碳纤维树脂基复合材料,其比强度、比模量综合指标在现有结构材料中是较高的,在强度、刚度、重量、抗疲劳蠕变特性、化学稳定性等方面相较于传统的材料颇具优势。
本发明由于采取以上技术方案,其具有以下优点:
1、本发明提出了一种变形自检测的碳纤维树脂锚杆,该类型的树脂锚杆利用导电复合材料的拉敏特性,通过监测锚杆的电阻变化以获取其自身变形信息而无需在加固体内安装传感设备,避免了因为外部传感器的植入而引起的变形测试精度下降以及传感器耐久性不满足要求的现象。
2、在矿山巷道、隧道、边坡、坝体、加筋挡土墙等工程中,碳纤维树脂锚杆均有广泛的应用,并可对其进行全寿命周期内加固体的变形监测及安全预警。
附图说明
图1导电聚合物渗滤现象示意图;
图2碳纤维含量与电阻率关系曲线;
图3碳纤维长径比对导电性影响;
图4全长树脂锚杆锚固示意图,其中,1—导线;2—锚杆杆体;3—托盘;4—螺母;
图5归一化电阻率与应变关系;
图6归一化电阻率与应变关系。
具体实施方式
以下通过实施例的方式进一步说明本发明,但并不因此将本发明限制在所述的实施例范围之中。下列实施例中未注明具体条件的实验方法,按照常规的方法和条件进行选择。
实施例1:
(1)碳纤维长度及含量的确定
为了得到所需的碳纤维树脂复合材料,以室内试验的方式进行复合材料的研制,选取聚乙烯树脂为基材,以碳纤维为填料,如图1、2所示,碳纤维的长度取为4mm~6mm。
(2)碳纤维树脂锚杆变形-电阻关系标定
根据室内进行的导电复合材料的拉伸试验,测得复合材料的变形与电阻变化之间的关系,得出二者间的函数关系:ΔR/R0=F(ε),其中ΔR/R0叫做归一化电阻率,ε为应变值。
(3)碳纤维树脂锚杆的制备
不饱和聚酯树脂为基材,大理石粉、三乙醇胺为掺合料,长度为4~6mm的碳纤维为导电填料,进行树脂锚杆的制备。首先,将上述的碳纤维用丙酮浸泡,洗涤,烘干后,与上述的不饱和聚酯树脂、大理石粉、促进剂混合,制成黏稠状粘结材料,得树脂锚固剂;其次,取螺纹玻璃钢锚杆作为锚杆杆体,在底部和上部分别粘贴导电片和导线,引出导线,用上述的树脂锚固剂对锚杆进行全长锚固,固化后,加装托盘和螺母,即得变形自检测的碳纤维树脂锚杆碳纤维树脂锚杆(如图4所示);
(4)应用范围
在矿山巷道、隧道、边坡、坝体、加筋挡土墙等工程中,碳纤维树脂锚杆均有广泛的应用,并可对其进行全寿命周期内加固体的变形监测及安全预警。
实施例2:隧道工程中碳纤维树脂锚杆
制备步骤同实施例1,不同之处在于,所述不饱和聚酯树脂、大理石粉、三乙醇胺、碳纤维的质量比为:80:4:3:6。
隧道工程中,锚杆主要是用来提供纵向拉力,克服岩体抗拉能力不足的缺点,力学观点上表现为提高了岩体的粘聚力和内摩擦角,以限制岩体的脱落。但由于围压等因素的存在,导致岩体内部锚杆难以监测的变形,最终会使隧道发生变形破坏甚至垮塌造成生命财产的损失,使用专业设备定期检测则耗时费力,操作不便。因此,可采用安装碳纤维树脂锚杆的方式解决以上问题。以聚乙烯树脂为基材,以长度为4~6mm的碳纤维为导电填料,进行锚杆的制备(归一化电阻率与应变关系式为:ΔR/R=0.142e1 . 315ε)。碳纤维树脂锚杆既能通过自身的抗拉特性加固岩体防止脱落,又可通过其拉敏效应下电阻率-应变变化关系进行隧道岩体及锚杆变形的监测,为隧道的养护及灾害的监测提供依据,保证了工程的安全,减少了全寿命周期的工程成本。
实施例3:边坡挡土墙中的碳纤维树脂锚杆
制备步骤同实施例1,不同之处在于,所述不饱和聚酯树脂、大理石粉、三乙醇胺、碳 纤维的质量比为:90:8:5:6。
边坡工程中,边坡的稳定坚固至关重要,因此,通常采用锚杆支护的方法加固边坡,不但提高了稳定性,降低了成本。为了更好地保证边坡的稳定性,方便监测边坡及锚杆的变形,采用碳纤维树脂锚杆对边坡进行全周期寿命内的监测,防止工程事故的发生(锚杆制作工艺如上,归一化电阻率与应变关系为:ΔR/R0=0.102ε+0.98,如下图所示)。通过电阻率应变间的变化关系以及锚杆应变极限,就能对边坡变形稳定进行及时方便的监测,保证了工程安全,又减少了全寿命周期的工程成本。
上述虽然结合附图对本发明的具体实施方式进行了描述,但并非对本发明保护范围的限制,所属领域技术人员应该明白,在本发明的技术方案的基础上,本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围以内。
Claims (3)
1.一种变形自检测的碳纤维树脂锚杆的制备方法,其特征在于,包括如下步骤:
1)将碳纤维用丙酮浸泡,洗涤,烘干后,与不饱和聚酯树脂、大理石粉、促进剂混合,制成黏稠状粘结材料,得树脂锚固剂;
2)取螺纹玻璃钢锚杆作为锚杆杆体,在底部和上部分别粘贴导电片和导线,引出导线,用上述的树脂锚固剂对锚杆进行全长锚固,固化后,加装托盘和螺母,即得变形自检测的碳纤维树脂锚杆;
所述不饱和聚酯树脂、大理石粉、促进剂、碳纤维的质量比为80~90:4~8:3~5:6;
所述变形自检测的碳纤维树脂锚杆的原料主要由玻璃纤维、树脂及树脂锚固剂组成,其中所述的玻璃纤维占原料重量百分比为70%-85%,所述树脂锚固剂由不饱和聚酯树脂、大理石粉、促进剂、碳纤维组成。
2.权利要求1所述的方法制备的变形自检测的碳纤维树脂锚杆。
3.如权利要求2所述的锚杆在全寿命周期内加固体的变形监测与安全预警中的应用。
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