爆破作用对软弱夹层岩质边坡稳定性影响试验研究
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摘要
根据含软弱夹层顺层岩质边坡爆破中产生爆破振动和层裂效应的特点,推导了在顺层岩质边坡爆破时的边坡稳定性系数计算公式,并以顺层岩质边坡模型爆破试验实测数据为基础,按极限平衡法进行了爆破作用下顺层岩质边坡的稳定性分析。对试验结果的计算分析表明,爆破瞬间,爆破振动和层裂效应导致边坡稳定性降至极限平衡状态附近,易产生一定位移,稳定性系数降幅达64%;爆破后,层裂效应导致边坡自稳能力降低,其降幅达30%—35%,这与试验现象吻合较好。据此提出了适合顺层岩质边坡爆破的开挖方法以及相应的防护措施,为此类顺层岩质边坡爆破的优化设计提供了理论依据。
According to the characteristic of blasting vibration and bedding cracks caused by blasting excavation in bedding rock slope,the calculation method of stability coefficient of bedding rock slope formed by blasting was put forward.Based on the measured data of blasting test of bedding rock slope model,the stability analysis of slope influenced by blast effect was taken by using limit equilibrium equation.The calculated result of test data show that the self-stability of slope was down to limit equilibrium equation caused by blasting vibration and bedding cracks when blasting,which often brings on slide,and the decrement of stability factor is about 64%;blast bedding cracks decreased the self-stability of slope and the decrement is from 30% to 35% after blasting.Then some blasting excavation and protection methods for bedding rock slope were put forward.The paper provided theoretical basis for optimization design of blasting excavation of bedding rock slope.
According to the characteristic of blasting vibration and bedding cracks caused by blasting excavation in bedding rock slope,the calculation method of stability coefficient of bedding rock slope formed by blasting was put forward.Based on the measured data of blasting test of bedding rock slope model,the stability analysis of slope influenced by blast effect was taken by using limit equilibrium equation.The calculated result of test data show that the self-stability of slope was down to limit equilibrium equation caused by blasting vibration and bedding cracks when blasting,which often brings on slide,and the decrement of stability factor is about 64%;blast bedding cracks decreased the self-stability of slope and the decrement is from 30% to 35% after blasting.Then some blasting excavation and protection methods for bedding rock slope were put forward.The paper provided theoretical basis for optimization design of blasting excavation of bedding rock slope.
引文
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[7]肖正学,张志呈,李朝鼎.爆破地震波动力学基础与地震效应[M].成都:电子科技大学出版社,2004:371.
[2]刘恭忍,王克成,刘云贺.高边坡开挖爆破动力稳定分析方法研究[J].西安理工大学学报,1997,13(4):308-313.
[3]胡益华,李宁,韩信,等.岩石边坡爆破动力荷载计算方法初探[J].水利与建筑工程学报,2003,3(1):49-52.
[4]吴青山,张继春.顺层路堑边坡岩体爆破的层裂效应实验研究[J].中国铁道科学,2004,25(3):50-54.
[5]张西前.节理岩体边坡爆破动力稳定性分析研究[D].西安:西安理工大学,2006.
[6]周维垣.高等岩石力学[M].北京:水利电力出版社,1990:238.
[7]肖正学,张志呈,李朝鼎.爆破地震波动力学基础与地震效应[M].成都:电子科技大学出版社,2004:371.
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