余荣安
摘要:为克服沙漠地区铁路路基施工存在的风积沙填料较松散、上料困难、压实难及压实度
难以控制等问题。结合风积沙路基施工工程实例简要介绍了沙漠地區风积沙路基施工的工艺,其中重点介绍了风积沙路基填筑压实的过程。对于沙漠地区路基湿压法施工。重点是解决好施工用水、一次摊铺风积细砂土层厚度、洒水量控制及碾压遍数、振动碾压的频率等问题,应遵循短、快的原则;为沙漠地区铁路路基施工提供技术参考。
关键词:风积沙路基;湿压法;施工
中图分类号:U412.36+6 文献标识码:A 文章编号:
Abstract: in order to overcome the desert areas of the existing railway subgrade construction for wind-blown sand packing than to loose, feeding difficulties, compaction difficult and compaction degree hard to control. Combined with wind-blown sand subgrade construction engineering example this paper briefly introduces the desert wind deposited sand subgrade construction craft, of which mainly introduces wind-blown sand subgrade compaction process. For desert region roadbed wet pressure construction. Key to the construction of water, a paving wind-blown sand soil layer thickness, sprinkle water control and compaction quantities, vibration frequency of RCC, should follow the principle of short, fast; In desert areas railway roadbed construction to provide the technology reference.
Keywords: wind-blown sand subgrade; Wet pressure; construction
1 引言
我国沙漠在内蒙、新疆等地分布较广,且多为风积沙。由于沙漠地区人烟稀少匮乏建筑材料,筑路所需的土、砂石料等主要材料均需远运,工程造价较高。而沙漠地区风积沙分布广泛、储量丰富、取材方便,因此在沙漠地区为降低工程造价,本着就地取材的原则路基填筑应以风积沙为主。根据风积沙的物理力学性质和实践结果表明,风积沙路基具有整体稳定性好、沉降量小、沉降速度快、水稳性好等优点;但风积沙颗粒组成细且颗粒单一均匀,粉黏粒含量很少,渗透系数较大,比表面积很大,在天然条件下呈松散状态,内部粘聚力几乎为零,抗剪性能极差。在外力作用下表面易产生位移;同时又由于沙漠地带特殊的气候、地质状况,使得沙漠地区风积沙路基的施工比一般气候、地质条件下的路基施工难度要大得多,特别是风积沙路基施工中压实度难以控制及上料比较困难[1,2]。……