岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2013年
8期
2218-2224
,共7页
李兴华%龙源%纪冲%周翔%何洋扬%路亮
李興華%龍源%紀遲%週翔%何洋颺%路亮
리흥화%룡원%기충%주상%하양양%로량
爆破地震波%波函数展开法%隧道围岩%隧道衬砌%动应力集中系数
爆破地震波%波函數展開法%隧道圍巖%隧道襯砌%動應力集中繫數
폭파지진파%파함수전개법%수도위암%수도츤체%동응력집중계수
blasting seismic wave%wave function expansion method%tunnel surrounding rock%tunnel lining%dynamic stress concentration factor (DSCF)
将爆破地震波进行合理近似简化,采用波函数展开法,推导出无限岩石介质中爆破地震波作用下隧道围岩和衬砌动应力集中系数的表达式。结合具体算例,分析隧道不同位置上爆破地震波主频、隧道几何参数和隧道围岩和衬砌物理力学指标对动应力集中系数的影响。分析结果表明,爆破地震波主振频率对隧道围岩和衬砌中的动应力集中系数(DSCF)影响较大,隧道不同位置和不同方向应力的动应力集中系数随主振频率的变化趋势不同,低主振频率引起的动应力集中系数较大,不利于隧道的抗爆破振动;隧道几何参数对隧道围岩和衬砌内侧切向应力动应力集中系数影响趋势不同;隧道衬砌弹性模量对隧道结构动应力集中系数影响较大,泊松比次之;泊松比较大的隧道围岩具有一定的抗爆破振动作用,但效果有限。
將爆破地震波進行閤理近似簡化,採用波函數展開法,推導齣無限巖石介質中爆破地震波作用下隧道圍巖和襯砌動應力集中繫數的錶達式。結閤具體算例,分析隧道不同位置上爆破地震波主頻、隧道幾何參數和隧道圍巖和襯砌物理力學指標對動應力集中繫數的影響。分析結果錶明,爆破地震波主振頻率對隧道圍巖和襯砌中的動應力集中繫數(DSCF)影響較大,隧道不同位置和不同方嚮應力的動應力集中繫數隨主振頻率的變化趨勢不同,低主振頻率引起的動應力集中繫數較大,不利于隧道的抗爆破振動;隧道幾何參數對隧道圍巖和襯砌內側切嚮應力動應力集中繫數影響趨勢不同;隧道襯砌彈性模量對隧道結構動應力集中繫數影響較大,泊鬆比次之;泊鬆比較大的隧道圍巖具有一定的抗爆破振動作用,但效果有限。
장폭파지진파진행합리근사간화,채용파함수전개법,추도출무한암석개질중폭파지진파작용하수도위암화츤체동응력집중계수적표체식。결합구체산례,분석수도불동위치상폭파지진파주빈、수도궤하삼수화수도위암화츤체물리역학지표대동응력집중계수적영향。분석결과표명,폭파지진파주진빈솔대수도위암화츤체중적동응력집중계수(DSCF)영향교대,수도불동위치화불동방향응력적동응력집중계수수주진빈솔적변화추세불동,저주진빈솔인기적동응력집중계수교대,불리우수도적항폭파진동;수도궤하삼수대수도위암화츤체내측절향응력동응력집중계수영향추세불동;수도츤체탄성모량대수도결구동응력집중계수영향교대,박송비차지;박송비교대적수도위암구유일정적항폭파진동작용,단효과유한。
The blasting seismic wave is simplified reasonably. Based on wave function expansion method, the dynamic stress concentration factor equation of tunnel surrounding rock and lining under the blasting seismic wave is deduced in infinite rock. Combining with a typical case, the influences of the main frequency of the blasting seismic wave, geometric parameters and the physico-mechanical indices of tunnel surrounding rock and lining on dynamic stress concentration factor in the different positions of tunnel are analyzed. The analytical results show that the trend of dynamic stress concentration factor of different direction stresses with the main frequency of the blasting seismic wave are different at different positions. The dynamic stress concentration factor caused by the blasting seismic wave with low main frequency of the blasting seismic wave is larger, which is unfavorable for blasting vibration resistance. The influence trend of tunnel geometric parameters on the dynamic stress concentration factor of tangential stress of tunnel surrounding rock and lining is different. The elastic modulus of tunnel lining has a greater effect on dynamic stress concentration factor than the Poisson’s ratio. The tunnel surrounding rock with larger Poisson’s ratio have the effect of blasting vibration resistance, but the effect is limited.