混凝土大坝裂缝灌浆处理效果研究
|
摘要
混凝土大坝在施工期或运行期产生裂缝的现象较为普遍,为了满足工程安全运行的要求,一般对危害较大的裂缝进行灌浆处理。本文提出从以下四个方面对裂缝灌浆效果进行综合评价:(1)通过裂缝的成因、特点和危害性认识,评价灌浆处理原则、采用的嵌缝材料是否满足要求;(2)从灌浆施工工艺和质量控制手段评价裂缝灌浆效果;(3)对灌浆处理后的裂缝采取骑缝取芯样并进行力学性能试验,掌握裂缝灌浆后的实际抗拉和抗渗性能;(4)通过裂缝灌浆前后的三维有限元模拟计算,分析灌浆后混凝土坝整体稳定性、重点部位和裂缝处局部力学性能的差异。最后,以青铜峡大坝电站坝段三大条贯穿性裂缝的灌浆效果评价为例,介绍本评价方法的应用。结果表明:采用本评价方法能对裂缝灌浆效果进行较为科学、客观的评价,并对今后的大坝裂缝处理、评价提供借鉴。
It is common that concrete dams occur cracks in construction or operation.In order to operate safely,grouting is always adopted as the treatment for some harmful cracks.In this paper,the four aspects are considered for overall evaluations of crack grouting.First,by the recognition of causes and characteristics as well as the harm of cracks,the grouting principle is examined whether the grouting materials can meet the requirements.Second,the grouting is evaluated from grouting technology and the measures of quality-control.Third,the core samples of grouting obtained along the cracks are tested for mechanics properties so as to get the real behaviors of tensile strength and water-proof.Fourth,by 3D FEM simulation computation of fore-and-aft crack grouting,stability of the whole dam and the mechanics differences of key parts and partial sections of cracks after grouting are analyzed.Finally,the grouting for three big penetrable cracks of Qingtongxia dam is taken for an example to introduce the application of this evaluation,the results show that the evaluations of grouting proposed in this paper can be scientific and objective and can provide the references for crack grouting of other concrete dams and its evaluation.
It is common that concrete dams occur cracks in construction or operation.In order to operate safely,grouting is always adopted as the treatment for some harmful cracks.In this paper,the four aspects are considered for overall evaluations of crack grouting.First,by the recognition of causes and characteristics as well as the harm of cracks,the grouting principle is examined whether the grouting materials can meet the requirements.Second,the grouting is evaluated from grouting technology and the measures of quality-control.Third,the core samples of grouting obtained along the cracks are tested for mechanics properties so as to get the real behaviors of tensile strength and water-proof.Fourth,by 3D FEM simulation computation of fore-and-aft crack grouting,stability of the whole dam and the mechanics differences of key parts and partial sections of cracks after grouting are analyzed.Finally,the grouting for three big penetrable cracks of Qingtongxia dam is taken for an example to introduce the application of this evaluation,the results show that the evaluations of grouting proposed in this paper can be scientific and objective and can provide the references for crack grouting of other concrete dams and its evaluation.
引文
[1]冯伯林,徐道远,周先贵,等.温度荷载作用下拱坝裂缝的断裂力学分析方法[J].合肥工业大学学报(自然科学版),2000,23(6):1003~1008.
[2]张雪虎,张社荣,陈祖坪.用任意加密有限元剖分的方法研究拱坝强度裂缝的产状[J].水利学报,2001,(9):68~72,80.
[3]李雪红,顾冲时,赵斌.大坝裂缝的突变模型[J].水电能源科学,2000,18(4):16~18.
[4]迟世春,林皋.带裂缝重力坝的并缝效果研究[J].世界地震工程,2001,17(2):104~109.
[5]包银鸿.我国大坝灌浆材料的多层次开发[J].华东水电技术,1995,(4):34~40.
[6]王志勇.非稳定性混凝土裂缝的成因与处理[J].海岸工程,2000,19(2):54~58.
[7]陈维杰,李孟奇,李中玉.虎盘水电站大坝裂缝成因分析[J].水利水电工程设计,2000,19(4):28~29.
[8]钱宁,谢振江.李家峡水电站主坝混凝土裂缝及其缺陷处理[J].西北水电,2000,(4):29~31,63,67.
[9]王春华,邹少君.青铜峡大坝电站坝段三大条贯穿性裂缝及3#胸墙裂缝处理[J].大坝与安全,1998,(4):61~65.
[10]吴子平,吴中如.顾冲时,等.青铜峡大坝电站坝段变形性态及裂缝物理成因分析[J].大坝观测与土测试,2001,25(1):25~28.
[2]张雪虎,张社荣,陈祖坪.用任意加密有限元剖分的方法研究拱坝强度裂缝的产状[J].水利学报,2001,(9):68~72,80.
[3]李雪红,顾冲时,赵斌.大坝裂缝的突变模型[J].水电能源科学,2000,18(4):16~18.
[4]迟世春,林皋.带裂缝重力坝的并缝效果研究[J].世界地震工程,2001,17(2):104~109.
[5]包银鸿.我国大坝灌浆材料的多层次开发[J].华东水电技术,1995,(4):34~40.
[6]王志勇.非稳定性混凝土裂缝的成因与处理[J].海岸工程,2000,19(2):54~58.
[7]陈维杰,李孟奇,李中玉.虎盘水电站大坝裂缝成因分析[J].水利水电工程设计,2000,19(4):28~29.
[8]钱宁,谢振江.李家峡水电站主坝混凝土裂缝及其缺陷处理[J].西北水电,2000,(4):29~31,63,67.
[9]王春华,邹少君.青铜峡大坝电站坝段三大条贯穿性裂缝及3#胸墙裂缝处理[J].大坝与安全,1998,(4):61~65.
[10]吴子平,吴中如.顾冲时,等.青铜峡大坝电站坝段变形性态及裂缝物理成因分析[J].大坝观测与土测试,2001,25(1):25~28.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心