鹅孵石与钻石

“为什么我们非要学习这些没用的东西呢？”

旋挖钻机在碎卵石地层钻进施工技术

本文针对碎卵石颗粒结构松散,粒径不均匀,稳定性差的特点,从施工方法确定、施工机具选择、常见事故的预防和处理等方面综述了旋挖钻机在碎卵石地层施工技术,具有较强的实用性和参考价值。

卵漂石地层大口径钻头与钻进工艺的选择

根据工程实例 ,通过钻头和钻进工艺的对比试验 ,得出了利用大直径滚刀钻头 ,在致密卵漂石地层施工大口径桩孔 ,能大幅度提高钻进效率。

卵石在村镇建筑工程中的应用

卵石作为一种地产建筑材料,因其材质优良,产地普遍,容易取得,价格低廉等原因,所以在我国许多地区的村镇中小型建筑工程及传统民居工程中有着广泛的应用。但是由于卵石受外观形状、产地、使用范围等方面的局限。到目前为止,国家还没有颁布有关这方面的技术操作规程。这就给一些以卵石为材料的分项分部的施工操作,质量检验监督及质量等级评定认证工作带来了一定的困难——无章可循。本人根据多年的工程实践,以新疆地区为例就卵石在建筑工程的应用问题谈一些粗浅看法,供同行的参考。

Incubation time approach in rock fracture dynamics

The paper is summarizing latest results connected with application of the incubation time approach to problems of dynamic fracture of rock materials. Incubation time based fracture criteria for intact media and media with cracks are discussed. Available experimental data on high rate fracture of different rock materials and incubation time based fracture criteria are used in order to evaluate critical parameters of causing fracture in these materials. Previously discovered possibility to optimize (minimize) energy input for fracture is discussed in connection to industrial rock fracture processes. It is shown that optimal value of momentum associated with critical load in order to initialize fracture in rock media does strongly depend on the incubation time and the impact duration. Existence of optimal load shapes minimizing momentum for a single fracturing impact or a sequence of periodic fracturing impacts is demonstrated.