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本刊本期发表了用振冲法加固软土地基的一组稿件,介绍国内外的应用实例和技术经验。用振冲法加固软土地基,国外已有成功先例,特別是日本新泻、十胜冲两次大地震后,用振冲法加固的地基上的建筑物基本完好或震害大为减轻的报道,更引起了普遍的重视。用振冲法可以通过振动和挤压加密地基软粘土和砂层,并和填入振冲孔内的透水材料形成的碎石桩一起,提高地基土层的承载能力;对地震区的建筑物的地基砂层,用振冲法加固后相对密度可达到0.8以上,同时透水桩体有利于振动孔隙水压力的消散,因而能有效地防止砂基液化。振冲法的施工机具和工艺都较简单,与地下水位的高低无关,工效高,成本低,效果显著,不失为加固软土地基和防止砂基液化的好方法,可用于处理各种建筑物的砂基特别是地震区建筑物的砂基、低水头闸坝的软土地基及房屋基础等工程,在有条件的地方应该大力推广。在我国应用振冲法只是开始,虽有一些成功的工程实例,但科学试验工作还不够充分,工程未经过实际考验,设计和施工尚无可以遵循的准则,施工机具有待完善和提高,其适用范围也还不大清楚。因此,希望在推广使用的同时,继续研究改进,从理论和实践上不断总结提高,使振冲法作为地基处理的一种新的有效手段,为加快水利电力建设发挥更大的作用。
In this issue, we published a series of manuscripts for strengthening soft soil foundation by vibro-impulse method and introduced application examples and technical experiences both at home and abroad. Vibration method to reinforce soft soil foundation has a successful precedent abroad, especially Japan Niigata, Shizuoka two earthquakes, vibram five fingers outlet, ground reinforcement by vibro-impact foundation buildings basically intact or greatly reduced earthquake damage Reported, but also aroused widespread attention. Vibration method can be used to vibrate and squeeze the soft clay and sand foundation, and filled with vibrating pierced perforation of the pile of permeable materials to improve the bearing capacity of the foundation soil; buildings on the earthquake area Of the ground sand, reinforced by vibro-impact method can reach a relative density of 0.8 or more, while permeable pile body is conducive to the dissipation of vibration pore water pressure, which can effectively prevent sand-based liquefaction. Vibration method of construction machinery and technology are relatively simple, and has nothing to do with the level of the groundwater level, high efficiency, low cost, the effect is remarkable, after all, to strengthen the soft ground and prevent sand-based liquefaction of a good method can be used to deal with various buildings Sand-based building, especially in the earthquake zone sand foundation, low head dam soft foundation and housing foundation and other projects, where conditions permit should be vigorously promoted. In our country, the application of vibro-impulse method is just the beginning. Although there are some successful engineering examples, the scientific experiment is still not enough. The engineering has not been tested, and there is no standard to be followed in the design and construction. The construction machinery needs to be improved and improved. The scope is not yet clear. Therefore, it is hoped that the promotion and use will continue to be studied and improved, and the theory and practice will continue to be summarized and improved. As a new and effective means of foundation treatment, the vibration-impulse method plays a greater role in accelerating the construction of water resources and electricity.