铁道学报
鐵道學報
철도학보
2014年
1期
94-99
,共6页
膨胀土%膨胀力%原位试验%高速铁路
膨脹土%膨脹力%原位試驗%高速鐵路
팽창토%팽창력%원위시험%고속철로
expansive soil%swelling pressure%in-situ test%high-speed railway
利用平衡加压法在云桂高速铁路典型中-强膨胀土路段进行竖向膨胀力原位试验，研究竖向膨胀力随时间、含水率增量、卸荷回弹量的变化规律，并对试验过程中试验体周边地表的变形进行了监测。结果表明：竖向膨胀力随时间的变化规律与膨胀土中渗水通道的畅通情况密切相关；竖向膨胀力随含水率增量的变化规律可分为4个阶段，即初始线性增长阶段→过渡阶段→二次线性增长阶段→稳定阶段；卸荷时，膨胀土竖向回弹变形增加，竖向膨胀力不断减小，二者呈线性或二次曲线性变化；试体周边地表的隆起规律与竖向膨胀力随含水率增量的变化规律相一致。
利用平衡加壓法在雲桂高速鐵路典型中-彊膨脹土路段進行豎嚮膨脹力原位試驗，研究豎嚮膨脹力隨時間、含水率增量、卸荷迴彈量的變化規律，併對試驗過程中試驗體週邊地錶的變形進行瞭鑑測。結果錶明：豎嚮膨脹力隨時間的變化規律與膨脹土中滲水通道的暢通情況密切相關；豎嚮膨脹力隨含水率增量的變化規律可分為4箇階段，即初始線性增長階段→過渡階段→二次線性增長階段→穩定階段；卸荷時，膨脹土豎嚮迴彈變形增加，豎嚮膨脹力不斷減小，二者呈線性或二次麯線性變化；試體週邊地錶的隆起規律與豎嚮膨脹力隨含水率增量的變化規律相一緻。
이용평형가압법재운계고속철로전형중-강팽창토로단진행수향팽창력원위시험，연구수향팽창력수시간、함수솔증량、사하회탄량적변화규률，병대시험과정중시험체주변지표적변형진행료감측。결과표명：수향팽창력수시간적변화규률여팽창토중삼수통도적창통정황밀절상관；수향팽창력수함수솔증량적변화규률가분위4개계단，즉초시선성증장계단→과도계단→이차선성증장계단→은정계단；사하시，팽창토수향회탄변형증가，수향팽창력불단감소，이자정선성혹이차곡선성변화；시체주변지표적륭기규률여수향팽창력수함수솔증량적변화규률상일치。
With the swelling pressures balancing method,in-situ vertical swelling pressure tests were made in typical mid & strong expansive soil sections of the Yun-Gui High-speed Railway to study the law of change of vertical swelling pressures with time,dampness increments and decompression rebound amounts and to moni-tor ground surface deformations surrounding the specimen in the test processes.The results show as follows:The law of changing of vertical swelling pressures with immersion time is closely related to the penetrating pas-sage situation of weeper drains;changes of vertical swelling pressures with dampness increments can be divided into four stages,i.e.,the initial linear increasing stage,gradual transition stage,second linear increasing stage and stabling stage;when unloading,vertical rebound deformations increase in the shape of the linear or quad-ratic curve whereas vertical swelling pressures keep on decreasing;the upswelling law of ground surface sur-rounding the specimen is consistent with the changing law of vertical swelling pressures with dampness incre-ments.
