高压水作用下冻结井壁渗漏水机理试验研究
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摘要
随着煤矿新建井筒穿过的表土层加厚,在冻结井筒支护方面,主要采用双层钢筋混凝土塑料夹层复合井壁结构形式。虽然这种井壁结构在我国的冻结井筒中得到推广应用,但它并没有从根本上解决冻结井壁的开裂渗漏水难题,冻结井壁渗漏水问题将变得更加突出、后果将更加严重。为彻底解决这一技术难题,本文在检索国内外现有资料的基础上,通过理论分析和试验研究对高压水作用下冻结井壁渗漏水机理进行了系统研究。
在理论分析方面,全面分析了冻结井壁所受温度应力及在温度应力作用下冻结井壁裂纹的产生,根据冻结井壁混凝土的力学性能,计算混凝土温度应力,根据损伤力学原理分析混凝土裂纹的产生、扩展和贯通,根据水力劈裂原理分析冻结井壁渗漏水的机理;在模型试验方面,根据相似理论,进行相似模型设计,模拟冻结井壁渗漏水情况,分别进行了高压水作用下含有施工冷缝井壁模型试验和含有温度裂纹井壁模型试验的研究,并分别采用跨孔直流电阻率法CT技术和超声波法检测混凝土模型渗漏水情况,试验结果表明,通常的施工冷缝在压力水作用下不会产生渗漏水;而温度裂纹在压力水作用下将产生裂纹扩展直至渗漏水,从而对冻结井壁渗漏水机理有了进一步的认识。本论文结果可为深冻结井壁渗漏水防治措施的确定提供试验依据。
With the new vertical shaft of coal mine cross-over special thick alluvium, it adopts composite shaft lining which is composite of double-layer laminated plastic in reinforced concrete wall structure when supporting freezing shaft wall. Although it has been used in freezing wall, it has not resolved the problem of leakage water of freezing shaft wall, and it will becomes more serious. In order to solve the technical problems in this paper, it has studies on mechanism of leakage water of freezing shaft wall under high-pressure water through theoretical analysis and experimental study on the basis of searching available information both at home and abroad.
In the theoretical analysis aspect, it has analyzed temperature stress and suffered in the freezing temperature wall under stress crack, calculating of thermal stress of concrete , according to the mechanical properties of concrete freezing wall ,analysis of concrete cracks, expansion and through, according to the principle of damage mechanics ,analysis of mechanism of leakage water of freezing shaft wall according to the principle of hydraulic fracturing; in the model test aspect, to design of model according to similarity theory in order to simulate seepage water of the freezing wall. It has studied on model test of shaft wall containing cold construction joints and temperatures crack containing wall under high-pressure water and inspected of concrete model for water leakage with cross-hole resistivity CT technology and ultrasonic. The test results indicates that the construction cold joints usually does not produce leakage of water under pressure water while producing crack until leakage of water under temperature crack and understands mechanism of leakage water of freezing shaft wall further. In this paper, it can supply the deep-freeze wall of water leakage prevention with experimental evidence. Chinese books catalog: TD265.3+2
在理论分析方面,全面分析了冻结井壁所受温度应力及在温度应力作用下冻结井壁裂纹的产生,根据冻结井壁混凝土的力学性能,计算混凝土温度应力,根据损伤力学原理分析混凝土裂纹的产生、扩展和贯通,根据水力劈裂原理分析冻结井壁渗漏水的机理;在模型试验方面,根据相似理论,进行相似模型设计,模拟冻结井壁渗漏水情况,分别进行了高压水作用下含有施工冷缝井壁模型试验和含有温度裂纹井壁模型试验的研究,并分别采用跨孔直流电阻率法CT技术和超声波法检测混凝土模型渗漏水情况,试验结果表明,通常的施工冷缝在压力水作用下不会产生渗漏水;而温度裂纹在压力水作用下将产生裂纹扩展直至渗漏水,从而对冻结井壁渗漏水机理有了进一步的认识。本论文结果可为深冻结井壁渗漏水防治措施的确定提供试验依据。
With the new vertical shaft of coal mine cross-over special thick alluvium, it adopts composite shaft lining which is composite of double-layer laminated plastic in reinforced concrete wall structure when supporting freezing shaft wall. Although it has been used in freezing wall, it has not resolved the problem of leakage water of freezing shaft wall, and it will becomes more serious. In order to solve the technical problems in this paper, it has studies on mechanism of leakage water of freezing shaft wall under high-pressure water through theoretical analysis and experimental study on the basis of searching available information both at home and abroad.
In the theoretical analysis aspect, it has analyzed temperature stress and suffered in the freezing temperature wall under stress crack, calculating of thermal stress of concrete , according to the mechanical properties of concrete freezing wall ,analysis of concrete cracks, expansion and through, according to the principle of damage mechanics ,analysis of mechanism of leakage water of freezing shaft wall according to the principle of hydraulic fracturing; in the model test aspect, to design of model according to similarity theory in order to simulate seepage water of the freezing wall. It has studied on model test of shaft wall containing cold construction joints and temperatures crack containing wall under high-pressure water and inspected of concrete model for water leakage with cross-hole resistivity CT technology and ultrasonic. The test results indicates that the construction cold joints usually does not produce leakage of water under pressure water while producing crack until leakage of water under temperature crack and understands mechanism of leakage water of freezing shaft wall further. In this paper, it can supply the deep-freeze wall of water leakage prevention with experimental evidence. Chinese books catalog: TD265.3+2
引文
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[3]程桦,周晖.冻结井壁预制弧板井壁接头刚度模型[J].煤炭学报,2004,29(2):167-171
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[5]王衍森,张开顺,李炳胜等.深厚冲积层中冻结井外壁钢筋应力实测研究[J].中国矿业大学学报,2007,36(3):287-291
[6]黄家会等.立井井壁温度变化规律实测研究[J].辽宁工程技术大学学报,2007,36(3):287-291
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[2]姚直书,杨俊杰.深表土中高强钢筋混凝土井壁力学性能的试验研究[J].煤炭学报,2004,29(2):167-171
[3]程桦,周晖.冻结井壁预制弧板井壁接头刚度模型[J].煤炭学报,2004,29(2):167-171
[4]吕恒林.钢筋混凝土井壁与深厚围岩(土)耦合机理研究[J].中国矿业大学学报,2007,36(3):287-291
[5]王衍森,张开顺,李炳胜等.深厚冲积层中冻结井外壁钢筋应力实测研究[J].中国矿业大学学报,2007,36(3):287-291
[6]黄家会等.立井井壁温度变化规律实测研究[J].辽宁工程技术大学学报,2007,36(3):287-291
[7]经来旺.冻结法施工中温度变化对井壁强度的影响[J].煤炭学报,2000,36(1):287-291
[8]经来旺.冻结壁融化阶段井壁温度应力分析[J].岩土力学,2004,36(9):287-291
[9]王振波.混凝土坝的温度损伤及损伤仿真计算[J].三峡大学学报,2003,25(5):391-394
[10] Bazant Z P. Predication of Concrete creep and Shrinkage: Past, Present and Future[J].Nuclear Engineering and Design, 2001,203:27～38
[11]焦修刚,刘光廷,李鹏辉等.混凝土温湿度耦合方程组的数值解法[J].三峡大学学报,2005,27(4):329-332
[12]王振波,徐道远.大体积混凝土结构温度荷载下的细观损伤分析[J].河海大学学报,2000,28(4):9～22
[13]盛金保,李雷.混凝土面板坝渗流分析方法初探[J].水利水运科学研究,2000,6:39～43
[14]张有天,陈平,窦铁生.三峡永久船闸混凝土边墙极端不利外水压力分析[J].岩石力学与工程学报,2000,19(2):186～192
[15]陈卫忠,杨建平,杨家岭等.裂隙岩体应力渗流耦合模型在压力隧洞工程中的应用[J].岩石力学与工程学报,2006,25(12):2385～2391
[16]朱岳明,龚道勇,章洪等.碾压混凝土坝渗流场分析的缝面渗流平面单元模拟法[J].水利学报,2003,3:63～68
[17]郭颂,水平应力—对采准巷道围岩稳定性的新认识[J].煤矿开采, 1998(4)
[18]马英明.立井厚表土层地压的理论与实践[J].中国矿业学院学报,1979(2):45~69
[1]崔广心.深厚表土中竖井井壁的外载[J].岩土工程学报,2003,29(3):167-171
[2]姚直书,杨俊杰.深表土中高强钢筋混凝土井壁力学性能的试验研究[J].煤炭学报,2004,29(2):167-171
[3]程桦,周晖.冻结井壁预制弧板井壁接头刚度模型[J].煤炭学报,2004,29(2):167-171
[4]吕恒林.钢筋混凝土井壁与深厚围岩(土)耦合机理研究[J].中国矿业大学学报,2007,36(3):287-291
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