基于支护结构安全系数的铁路隧道围岩膨胀性分级方法
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摘要
采用室内试验方法建立隧道膨胀性围岩含水量、加载压力与膨胀率的关系,以及自由膨胀率与无荷膨胀率、有荷膨胀率的关系;采用数值方法模拟新建山西中南部铁路线上庄1号隧道的施工过程,计算得到了不同膨胀率条件下各施工步序支护结构各截面的弯矩和轴力,从而计算出安全系数;基于隧道施工过程中支护结构安全系数计算,建立不同线膨胀率与隧道结构安全系数的关系并得到其计算公式,进而根据自由膨胀率、50 kPa荷载下有荷线膨胀率将膨胀土划分为Ⅰ～Ⅳ级。研究成果为类似膨胀土隧道的修建提供参考,具有重要的现实意义。
Through lab experiment,the relationships between water content of tunnel swelling surrounding rock,loading pressure and swelling rate were established,also relationships among free swelling rate,swelling rate without load and swelling rate with load were established.Using numerical method,the construction procedure of Shangzhuang No.1 tunnel on the Mid-south Railway of Shanxi province was simulate,and the bending moment and axial force of every cross-section of supporting structure of every construction stage with different swelling rates were calculated respectively.Then the safety coefficient was worked out.On the basis of above-mentioned safety coefficient,and after establishing the relationship between different linear swelling rate and tunnel safety coefficient,the calculation formula was obtained.Further,according to free swelling rate and linear swelling rate with the load under 50 kPa,the authors divided the swelling rocks into Ⅰ~Ⅳ levels.The results could serve as a reference to similar swelling rock tunnel and have a significant meaning.
Through lab experiment,the relationships between water content of tunnel swelling surrounding rock,loading pressure and swelling rate were established,also relationships among free swelling rate,swelling rate without load and swelling rate with load were established.Using numerical method,the construction procedure of Shangzhuang No.1 tunnel on the Mid-south Railway of Shanxi province was simulate,and the bending moment and axial force of every cross-section of supporting structure of every construction stage with different swelling rates were calculated respectively.Then the safety coefficient was worked out.On the basis of above-mentioned safety coefficient,and after establishing the relationship between different linear swelling rate and tunnel safety coefficient,the calculation formula was obtained.Further,according to free swelling rate and linear swelling rate with the load under 50 kPa,the authors divided the swelling rocks into Ⅰ~Ⅳ levels.The results could serve as a reference to similar swelling rock tunnel and have a significant meaning.
引文
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[3]中华人民共和国水利部.土工试验规程[S].北京:中国水利水电出版社,1999.
[4]经苏龙,白一琴.膨胀土的膨胀变化规律探讨及分析[J].大坝观测与土工测试,1999,23(3):40-41.
[5]杨庆,吴训川.膨胀岩工程性能的研究现状[J].勘察科学技术,1993(2):35-38.
[6]徐永福,史春乐.宁夏膨胀土的膨胀变形规律[J].岩土工程学报,1997,19(3):95-98.
[7]中华人民共和国交通部.GTJ D70—2004公路隧道设计规范[S].北京:人民交通出版社,2004.
[8]中华人民共和国铁道部.TB10003—2005铁路隧道设计规范[S].北京:中国铁道出版社,2005.
[9]张国智.ANSYS10.0热力学有限元分析实例指导教程[M].北京:机械工业出版社,2007.
[10]周坤.膨胀软岩隧道衬砌膨胀力数值模拟研究[D].成都:西南交通大学,2007.
[11]卢爱红.茅献彪.湿度应力场的数值模拟[J].岩石力学与工程学报,2002,21(S2):2470-2473.
[12]李成江.膨胀性围岩力学机制及其隧洞支护效应的数值模拟分析[D].上海:同济大学,1988.
[13]王小军.膨胀岩的判别与分类和隧道工程[J].水文地质工程地质,1995(2):44-48.