在平面波的作用下地下洞室的振动加速度分布规律研究
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摘要
利用模型试验和理论研究了在平面应力波的作用下,地下洞室振动加速度分布规律。结果表明:当洞室受到拱顶正上方平面波作用时,拱顶径向振动加速度是4个测量数据中最大的,是振动最激烈的地方;当入射方向从拱顶向左侧偏移至水平方向,迎爆侧的径向加速度都比背爆侧的径向加速度大;当入射方向在拱顶时,切向振动加速度从拱顶至侧墙是先增加后减小,入射方向在拱腰处,拐角的切向振动加速度应该注意;对比洞室的径向加速度和切向振动加速度,洞室的振动加速度允许峰值是由径向加速度控制。这将对实际工程进行抗爆设计非常有意义。
Based on model experiments and theory,the distribution of vibration acceleration of underground chambers was studied under the planar waves.The results show that when underground chambers are acted by planar waves from vault,the radial acceleration of roof is maximal in four monitored data;when the incident direction changing from vault to rib,the radial acceleration from face-blast side is larger than the back-blast side's;when the incident direction from vault,the tangential accelaeration increases firstly and then decreases from roof to side wall;the tangential acceleration of the corner should be attention when the incident direction from extrado.Compared to the radial acceleration and tangential acceleration,the permitted peak acceleration of underground chamber is controlled by radial acceleration,which is very meaning for practical engineerings to explosion resistance design.
Based on model experiments and theory,the distribution of vibration acceleration of underground chambers was studied under the planar waves.The results show that when underground chambers are acted by planar waves from vault,the radial acceleration of roof is maximal in four monitored data;when the incident direction changing from vault to rib,the radial acceleration from face-blast side is larger than the back-blast side's;when the incident direction from vault,the tangential accelaeration increases firstly and then decreases from roof to side wall;the tangential acceleration of the corner should be attention when the incident direction from extrado.Compared to the radial acceleration and tangential acceleration,the permitted peak acceleration of underground chamber is controlled by radial acceleration,which is very meaning for practical engineerings to explosion resistance design.
引文
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[3]毕佳,王源,谭跃虎,等.九华山隧道施工中爆破振动对明城墙影响的测试与评定[J].岩土力学,2006,27(S1):1265-1267.
[4]李洪涛,卢文波,舒大强,等.隧洞开挖爆破地震反应谱特征研究[J].爆炸与冲击,2008,28(4):331-335.
[5]陈明,卢文波,舒大强,等.爆破振动作用下边坡极限平衡分析的等效加速度计算方法[J].岩石力学与工程学报,2009,28(4):784-790.
[6]王光勇,顾金才,陈安敏,等.拱顶端部加密锚杆支护洞室抗爆加固效果模型试验研究[J].岩土工程学报,2009,31(3):378-383.
[7]杨自友,顾金才,陈安敏,等.爆炸波作用下锚杆间距对围岩加固效果影响的模型试验研究[J].岩石力学与工程学报,2008,27(4):757-764.
[8]王光勇,顾金才,陈安敏,等.端部消波和加密锚杆支护洞室抗爆能力模型试验研究[J].岩石力学与工程学报,2010,29(1):51-58.
[9]朱传云,许桂生.爆炸应力波近似处理的分析与研究[J].岩土力学,2002,23(4):455-458.
[10]黎在良,刘殿魁.固体中的波[M].北京:科学出版社,1995.
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