發(fā)布時(shí)間：2019-03-16 18:50

【摘要】：針對高速公路、機(jī)場、鐵路等設(shè)施上的交通荷載易引發(fā)路基土的固結(jié)沉降問題,將交通荷載視為半正弦循環(huán)荷載,分析該類荷載作用下土體的固結(jié)過程以及荷載間歇期、荷載頻率、初始超靜孔隙水壓力等參量對固結(jié)過程的影響。通過修正Davis假定,使一維非線性固結(jié)控制方程適用于模擬具有非零初始超靜孔隙水壓力條件的飽和土固結(jié)過程,采用分離變量法推導(dǎo)半正弦循環(huán)荷載作用下一維非線性固結(jié)方程通解,并給出初始超靜孔隙水壓力為常數(shù)、正三角形分布和倒三角形分布3種典型初始條件下的解析解。模擬了不同的荷載間歇期、荷載頻率和初始超靜孔隙水壓力條件下均質(zhì)飽和黏土的固結(jié)過程。結(jié)果表明:固結(jié)過程中超靜孔隙水壓力峰值隨時(shí)間增大而減小,有效應(yīng)力和平均固結(jié)度峰值隨時(shí)間增大而增大;初始條件的差異對固結(jié)過程的早期具有明顯的影響,當(dāng)初始超靜孔隙水壓力為0時(shí),有效應(yīng)力和平均固結(jié)度峰值均最大,其他情況下從大到小依次為倒三角形分布、正三角形分布、矩形分布;間歇期或荷載頻率的差異對整個(gè)固結(jié)過程均存在影響,隨著間歇期的增大,達(dá)到穩(wěn)定時(shí)的平均固結(jié)峰值減小,固結(jié)過程延緩,隨著荷載頻率的減小,平均固結(jié)度峰值增大,固結(jié)過程加快。
[Abstract]:In view of the consolidation settlement of roadbed soil easily caused by traffic load on expressway, airport, railway and other facilities, the traffic load is regarded as semi-sinusoidal cyclic load, and the consolidation process of soil under this kind of load as well as the intermittent period of load are analyzed. The influence of load frequency, initial hydrostatic pressure and other parameters on consolidation process. By modifying the Davis assumption, the one-dimensional nonlinear consolidation control equation is applied to simulate the consolidation process of saturated soils with non-zero initial hydrostatic pressure conditions. The general solution of one-dimensional nonlinear consolidation equation under semi-sinusoidal cyclic load is derived by the method of separated variables, and the analytical solutions under three typical initial conditions, i.e., the initial ultra-static pore water pressure is constant, the triangular distribution and the inverted triangular distribution are given. The consolidation process of homogeneous saturated clay under different loading intervals, loading frequency and initial hydrostatic pore pressure is simulated. The results show that the peak value of water pressure in excess pore space decreases with the increase of time, while the peak value of effective stress and average consolidation degree increases with the increase of time in the consolidation process. The difference of initial conditions has obvious influence on the early stage of consolidation process. At the beginning, the peak value of effective stress and average consolidation degree is maximum when the water pressure of excess pore space is 0. In other cases, the distribution of effective stress and average consolidation degree is inverted triangle in turn from large to small. Triangular distribution, rectangular distribution; With the increase of intermittent period, the average consolidation peak value decreases and the consolidation process slows down. With the decrease of load frequency, the average consolidation degree peak value increases, and the average consolidation peak value increases with the increase of the intermittent period, and the average consolidation peak value increases with the increase of the load frequency. The consolidation process is accelerated.
【作者單位】： 長安大學(xué)環(huán)境科學(xué)與工程學(xué)院;長安大學(xué)旱區(qū)地下水文與生態(tài)效應(yīng)教育部重點(diǎn)實(shí)驗(yàn)室;陜西理工大學(xué)土木工程與建筑學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(41602237) 中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(310829151076,310829161011,310829163307)
【分類號】：U416.1

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