摘要
分析了线性加载路基沉降的机理,直接从一维固结度出发,证明了沉降曲线呈S形状。对Gompertz模型、Logistic模型、Weibull模型等3种呈S形状的成长模型进行数学分析。前两种模型虽然使用广泛,但不能反映加载速率和施工方法的影响,反弯点处沉降值与最终沉降相对不变,用它们进行基础全程沉降模拟具有一定的局限性;相对而言,Weibull模型具有较强的适用性。最后对路基沉降模拟提出了建议。
Mechanism of settlement of ramp loading roadbed on soft ground is analyzed; and proof of settlement-time curve appearing S-shape is conducted directly based on consolidation degree of one-dimension soil consolidation theory. Mathematical analyses of Gompertz, logistic, Weibull growth model that appearing S-shape are conducted. Although Gompertz, logistic growth models are adopted extensively to predict settlement of ramp loading roadbed, they have deficiencies such as： （1）neglecting loading velocity; （2）neglecting construction art; （3） relative constant ratio of settlement at inflection point to ultimate settlement. Good usabilitv of Weibull erowth model is nointed out. Finally. suggests on prediction of soft roadbed settlement are proposed.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2006年第5期791-794,共4页
Rock and Soil Mechanics
关键词
路基沉降
孔压滞后
固结度
S形曲线
最终沉降
拐点
settlement of roadbed
consolidation degree
S-shape curve
ultimate settlement
inflection point
