风积土路基道路冻害防治措施试验  

Experimental on preventing and curing measures of frost damage on road of Aeolian soil subgrade

作　　者：张向东[1] 朱光宇[1] 刘浜葭[1] 

机构地区：[1]辽宁工程技术大学土木建筑工程学院,辽宁阜新123000

出　　处：《广西大学学报（自然科学版）》2009年第4期431-437,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(50478033);辽宁省高等学校优秀人才支持计划项目(2008RC23)

摘　　要：根据辽西地区的水文地质气候特征，考察了近几年的辽西地区风积土路基道路的冻害现象，发现存在的道路冻害现象有：冻胀、融沉、翻浆冒泥、开裂等。分析研究表明土质、温度、水是产生这些冻害的根本原因。针对这些冻害，从其产生的根本原因出发，采取碾压击实路基、风积砂换填、无机结合料稳定土路基等措施对其进行防治，并进行了路基风积土冻结试验、碾压击实试验、风积砂换填试验、水泥煤渣稳定土层和石灰粉煤灰稳定土层试验研究。通过对试验数据分析得到了其冻结规律，采用碾压击实法，其最佳压实度度为93％-95％；采用风积砂换填隔水法，风积砂垫层时位置应在地下水位以上，一般应在土基50—80cm深度处铺筑，换填厚度在中湿路基为15—20cm，潮湿路基为20～30cm；采用无机结合料稳定土防止、防治风积土路基道路冻害，厚度均应在25cm左右，其中水泥、煤渣、风积土的质量比约为6：40：54，石灰、粉煤灰、土三者的质量比为14：30：56，在此基础上，对各种措施的防治效果进行了对比评价。According to the characteristics of the hydrologic geology and the climate in the western region of Liaoning province, after inspecting the phenomenon of Aeolian roadbed road frost damage in recent years and found the phenomenon of the road frost damage include frost heaving, thaw collapse, the mud pumping, cracking, etc. Analysis shows that the soil, temperature, water are the basic cause of such frost damage. Against these frost damages, took the measures which were presented against the basic causes for the prevention and curing of the frost damage, for instance, rolling the roadbed, replacing the Aeolian sand and stabilizing the soil of inorganic binder and so on, and did experimental study indoor for every preventing and curing measure. The rule of frost damage has been concluded based on the analysis of experimental data. When rolling the roadbed, the best degree of compaction is 93% - 95%. When taking Aeolian sand for preventing the water rising, the Acolian sand replacement should be set above water table, which should normally be made at 50 -80 cm depth of soil base with 15 - 20 cm thickness of replacement for medium wet subgrade and 20-30 cm for wet subgrade . When using stabilized soil inorganic binder for prevention and control of the frost damage, the thickness of the binder is about 25 cm The mass proportion of cement, coal and Aeolian is about 6： 40：54 and lime, fly ash and aeolian is about 14： 30： 56. Based on these, comparative evaluation for various preventing and curing measures of the Aeolian subgrade was given.

关 键 词：风积土 道路冻害 冻结 压实度 风积砂换填 无机结合料稳定土 

分 类 号：U418.53[交通运输工程—道路与铁道工程]