“深挖洞”的生动写照——油画《地下长城》简介

1973年1月1日两报一刊发表了毛主席“深挖洞，广积粮，不称霸”的指示。为了反映广大人民群众坚决响应毛主席这一伟大号召的热情．湖北省油画家刘三多与伍振权参观了本地区许多人防工程，对于工程兵移山填海的创造力有了强烈的感受，于1974年创作了油画《地下长城》。该油画画面是一位女民兵在宽阔敞亮的人防工程里指挥来往汽车的场面，生动地刻画出了这一英雄人物英姿飒爽的形象．反映了中国人民创造地下长城的宏伟场面。

筑起我们新的长城——解读中国“深挖洞”

第四章 挖洞评说 11．一场没有公开的争论。群众评说“深挖洞”。 1978年冬，北京，京西宾馆，服务员们刚刚送走第三次全国人民防空会议代表，又忙着接待出席党的十一届三中全会的中央委员和候补中央委员。两个会议相隔不到一个月，前者研究战争中如何生存的话题，后者提出把工作重点转移到经济建设上来。

Comparison of vibrations induced by excavation of deep-buried cavern and open pit with method of bench blasting

The measured data of vibrations induced by excavation of deep-buried cavern and open pit with method of bench blasting were analyzed by Fourier Transform and Wavelet Transform,and the characteristics of vibrations induced under these two circumstances were studied.It is concluded that with the similar rock condition and drilling-blasting parameters,vibration induced by bench blasting in deep-buried cavern has a higher main frequency and more scattered energy distribution than that in open pit.The vibration induced by bench blasting in open pit is mainly originated from the blast load,while the vibration induced by bench blasting in deep-buried cavern is the superposition of vibrations induced by blast load and transient release of in-situ stress.The vibration induced by transient release of in-situ stress increases with the stress level.