基于裂离参量的粒状土颗粒破碎量化方法  

Quantitative method for crushing of granular soils based on discarding parameters

作　　者：徐日庆[1,2] 畅帅[1,2] 李雪刚[1,2] 陆建阳[1,2] 

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《岩土工程学报》2013年第12期2179-2185,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51178420);国家科技支撑计划项目(2012BAJ01B04-3)

摘　　要：以粒组为分析对象,将颗粒破碎引起粒状土级配变化的过程划分为3个阶段。在此基础上,针对单个粒组与粒状土整体的颗粒破碎情况分别提出了裂离比Rk与加权裂离率Bd的新概念。在进行等比级数简化假设的基础上,给出了两者的计算方法。研究已有文献中搜集的21组颗粒破碎试验资料发现:在所研究的围压范围内,对于不同粒状土材料,Bd–3均呈现出线性关系。且对于多数试验结果,该关系存在一个明显的斜率折点。综合考虑围压、母岩强度与原始级配对Bd的影响发现,对于灰岩、角砾岩、砂岩料等不同粒状土材料,Bd的变化规律具有归一性。整理已有试验资料中不同粒状土的加权裂离率Bd与破碎率Bg发现,Bd与Bg间存在一定的指数化关系。最后通过优势分析,指出基于裂离参量的粒状土颗粒破碎量化方法有其自身的特点与优势,具备广阔的研究前景。Taking fraction as analysis object, the crushing of granular soils is divided into three stages. Based on this, new concepts of discarding ratio Rk and weighted discarding ratio Bo are proposed for the crushing of a single fraction and granular soils as a whole respectively. And their theoretical computing methods are put forward based on the simplified hypothesis of geometric progressional distribution. By investigating the collected test data of particle crushing for 21 granular soil samples from references, it is found that the relationship between Bd and tr3 is linear for different granular soils with varying values ofo3 in research ranges. In addition, there exist significant turning points of slope in such linear relationship for most test results. Considering the combined effects of confining pressure, strength of mother rock and original grain composition, it is concluded that the variation of Bd is generalized for the particle breakage of limestone, breccia and sandstone. By sorting out the weighted discarding ratio Bd and the breakage factor Bg of the collected test results for different granular soil samples, it is indicated that the relationship between Bo and Bg is exponential. Finally, it is pointed out that the proposed quantitative method for the crushing of granular soils based on the discarding parameters has its own characteristics and advantages, which has broad research prospects.

关 键 词：粒状土 颗粒破碎 裂离比 加权裂离率 

分 类 号：TU411[建筑科学—岩土工程]