CMSC型固化剂改良土的新型CBR试验研究

针对苏北某高速公路沿线特殊软土的特点,采用两种方案按全粉料配料的方法配制CMSC型固化剂,并按一定剂量掺入土中。同时,考虑当地的水文气候因素,针对传统钢制击实筒的饱水条件偏保守的特点,研制了新型击实筒,在新型击实筒内制备试件并养护至规定龄期,采用新型浸水装置饱水,进行贯入试验。结果表明,试件的各向饱水条件更接近实际工况,增强了CBR值的可信度。CMSC型固化剂改良土的改良效果优于石灰改良土,且固化剂掺入剂量存在最佳掺量,同时分析了CMSC型固化剂的加固机理,为进一步研究和工程应用提供了参考。

STUDY OF NEW CBR TEST ON IMPROVED SOIL WITH CMSC FIRMING AGENT

With respect to the characteristics of the special soft-soil along an expressway in northern Jiangsu province,the CMSC firming agent was synthesized with ingredient method of full powder by adopting two projects and added into soil with given proportion.Meanwhile,considering the local hydrologic and climatic factors and aiming at the conservative soaking condition,a new hit canister was invented.The soils improved with the CMSC firming agent were compacted in the new hit canister.The compacted samples were taken out and cured.When the curing time was mature,they should be soaked into the water with the new soaking equipment.At last,the pluging test was conducted.It indicated that the compacted samples were saturated within three-dimensional soaking condition.The CBR value was ensured its credibility within this new soaking condition which was closer to the actual situation.The engineering properties of soil improved with CMSC firming agent were better than lime-improved soil.The optimum proportion of CMSC firming agent could be obtained and the improving mechanism of CMSC soil firming agent were studied further more.The results could be used for reference to further study and engineering application.