浅谈公路工程工中的石方爆破

随着青海省公路基础建设的发展,公路穿越的地质条件越来越复杂,涉及到的挖石方地段特别多,在这些路段爆破技术的使用就显得特别的重要.石方爆破在公路施工中制约着整个项目的工期,一般为公路施工项目的重点、难点工程.在石方爆破的施工中,本文可供参考.     

带非局部源的退化奇异反应扩散方程解的爆破

本文讨论了如下带非局部源的高维退化奇异反应扩散方程：｜x｜^m u,-div（｜x｜^a△↓u）=∫Ωu^p（X,t）dx-ku^q,在对初值一定的假设下,得到p=q〉1和p〉q时方程的解均在小初值整体存在而在大初值在有限时刻爆破.     

一类带调和势的非线性Klein-Gordon方程

运用能量和微分、积分不等式技巧,讨论一类带调和势的非线性Klein-Cordon方程u#-△u |x|2u mu=a|u|pu b|u|q,x ∈RN,t>0,其中,u=u(t,x):R ×RN→C的初值问题,得到了在一定条件下解的不稳定性质.     

浅谈高陡坡路堑爆破开挖施工技术

简要介绍了工程概况,论述了爆破方案和爆破参数的确定,并探讨了安全技术措施。     

回采工作面冲击危险性评价及防治技术研究

唐口煤矿5 3 0 1工作面采深近千米,在高采深条件下,巷道所处的围岩应力环境大为改变,高应力现象将尤为突出,由此带来的冲击地压等煤岩动力灾害已成为影响矿井安全生产的一大难题。为防止深井条件下破坏性冲击地压的发生,该文采用综合指数法进行工作面冲击地压危险性评价,利用钻孔卸压和爆破卸压进行冲击地压防治,为5301工作面安全开采提供了保障。根据对唐口煤矿5301工作面冲击地压危险性评价方法与防治技术的研究,对具有类似条件下的煤层开采,具有相应的借鉴作用。     

论城镇复杂环境条件下爆破危害的防控

通过某洞库工程的施工,对所采取的防护结构、爆破参数、爆破微差网络技术的合理性,以及控制或减小爆破冲击波、振动、飞石、噪声等危害的成效进行实际论证。为确保周边环境的安全,通过理论分析、计算,试爆、振动测试、防护结构改造等控制技术,安全的解决了本工程的施工难点,取得了适合于本工程爆破环境要求的成功经验。     

A new theory of rock-explosive matching based on the reasonable control of crushed zone

Rational rock-explosive matching is of great importance to enhancing explosive energy effective utili- zation and improving rock fragmentation effect. The traditionally emphasized method of acoustic impedance matching is not rational. Based on blasting breakage mechanism, a new theory of rock-explosive matching in drilling and blasting is proposed. The new approach chooses explosive parameters by reasonable control of the size of crushed zone under the condition of fully fragmentation between adjacent blast holes. This method can directly reflect the blasting fragmentation effect and energy effective utilization, which is easy to implement. Al- so, a modified model is developed, taken adjacent blast hole blasting loading into account. As a result, explo- sive parameters of different grades of rock are given in full coupling on-site mixed explosive charge for different project objectives.     

Key technologies of precision demolition blasting of ultra-long urban viaduct in complicated surroundings

The key technologies of precision blasting were put forward based on the characteristics of urban via- duct blasting demolition in complicated surroundings. Initial bending instability mechanics model of reinforcing steel bar frame of blasting fragmented pier and sequenced collapsed dynamic model were established for quanti- tative blasting design. Technologies of water pressure blasting were applied in multi-cell box girder fragmenta- tion. The detonating network of non-electric duplication crossover was adopted for the safety and reliability of ultra-long delay. The rationality of blasting scheme and parameters were validated by physical model test. Harm- ful effects were forecasted and controlled by integrated protective technologies. Specialization, cooperation, pre- cision, execution （SCPE） project management method was put forward for precision management. The key tech- nologies of precision demolition blasting can provide reference for similar proiects.     

玉米秸秆瞬间蒸汽爆破预处理的回归优化和结构分析

采用响应面法回归分析优化瞬间蒸汽爆破预处理玉米秸秆过程,研究了汽爆压强、维压时间以及填料量三因素对酶解糖产率的影响,基于Box-Behnken设计,分析并获得了一个二阶线性方程模型,能够较好地拟合实验值。获取的最优条件为汽爆压强3.5MPa,维压时间50s,填料量60g,此时糖产率达到54.37%,相比于未处理物料,其糖化率提高了1.88倍。采用扫描电镜、X射线衍射分析以及傅里叶红外光谱对处理前后的物料进行结构和组分分析,与未处理的物料相比,处理后的物料结晶度明显降低,颗粒度减小,可及度显著提高。     

爆破施工对邻近隧道安全的影响

城市交通工程新建隧道爆破施工会对近邻既有工程的衬砌结构产生影响,严重时会影响既有工程结构的安全.本文基于数值模拟方法,计算分析了4种最危险施工条件下,新建崂山隧道爆破对既有仰口公路隧道的影响.结果表明:崂山隧道的进、出口及中间段,爆破施工对既有仰口隧道的左线影响有限,对较远处右线的影响较小.在崂山隧道进口、出口和垂直距离最近处,计算结果都远低于我国《爆破安全规程》(GB 6722-86)规定的交通隧道安全振动速度标准值15 cm/s.但在崂山隧道断层破碎带(F5)爆破施工最危险条件下,计算速度最大值达到15.26 cm/s,该值已达到安全振动速度规定的临界值下限,建议施工过程中需要采取必要的工程安全措施.