防灾减灾工程学报
防災減災工程學報
방재감재공정학보
JOURNAL OF DISASTER PREVENTION AND MITIGATION ENGINEERING
2009年
6期
632-637
,共6页
高有斌%曾国海%徐步兴%叶凝雯
高有斌%曾國海%徐步興%葉凝雯
고유빈%증국해%서보흥%협응문
电渗法%强夯法%双控动力固结法%软粘土
電滲法%彊夯法%雙控動力固結法%軟粘土
전삼법%강항법%쌍공동력고결법%연점토
electro-osmotic method%forced tamping method%double-control dynamic consolidation method%soft clay
饱和软粘土含水率大、渗透性差,强夯处理时,超孔隙水压力不易消散,常规的排水措施效果不佳,而电渗降水已经被证明是一种有效的软粘土排水措施.本文提出了将电渗降水和强夯法相结合的地基处理方法--双控动力固结法,进行了双控动力固结法的处理试验,并与不降水强夯法和井点降水强夯法进行对比分析.结果表明,电渗法可迅速降低地下水位和地基土含水量,有效避免"弹簧土"的产生,提高单点夯最佳夯击能;可有效抑制夯后超孔隙水压力的急剧上升,并促进超孔隙水压力快速消散;在降水速度和土性改良方面,电渗降水优于井点降水.因此,应用双控动力固结法处理软粘土,有着很显著的加固效果.
飽和軟粘土含水率大、滲透性差,彊夯處理時,超孔隙水壓力不易消散,常規的排水措施效果不佳,而電滲降水已經被證明是一種有效的軟粘土排水措施.本文提齣瞭將電滲降水和彊夯法相結閤的地基處理方法--雙控動力固結法,進行瞭雙控動力固結法的處理試驗,併與不降水彊夯法和井點降水彊夯法進行對比分析.結果錶明,電滲法可迅速降低地下水位和地基土含水量,有效避免"彈簧土"的產生,提高單點夯最佳夯擊能;可有效抑製夯後超孔隙水壓力的急劇上升,併促進超孔隙水壓力快速消散;在降水速度和土性改良方麵,電滲降水優于井點降水.因此,應用雙控動力固結法處理軟粘土,有著很顯著的加固效果.
포화연점토함수솔대、삼투성차,강항처리시,초공극수압력불역소산,상규적배수조시효과불가,이전삼강수이경피증명시일충유효적연점토배수조시.본문제출료장전삼강수화강항법상결합적지기처리방법--쌍공동력고결법,진행료쌍공동력고결법적처리시험,병여불강수강항법화정점강수강항법진행대비분석.결과표명,전삼법가신속강저지하수위화지기토함수량,유효피면"탄황토"적산생,제고단점항최가항격능;가유효억제항후초공극수압력적급극상승,병촉진초공극수압력쾌속소산;재강수속도화토성개량방면,전삼강수우우정점강수.인차,응용쌍공동력고결법처리연점토,유착흔현저적가고효과.
High water content and poor permeability of saturated soft clays lead to difficult dissipation of excess pore water pressure in the forced tamping process;for the saturated soft clays,conventional drainage measures are inefficient while the electro-osmotic method has proved to be an effective drainage measure.A double-control dynamic consolidation method,the combination of the electro-osmotic method and the forced tamping method,is proposed in this paper for strengthening soils,and it has been compared with the un-dewatering forced tamping method and the well-point dewatering forced tamping method in a field study of the double-control dynamic consolidation mcthod.The results show that the electro-osmotic method can quickly decrease water level and water content in soils so that the occurrence of"spring soil"is effectively avoided to increase the optimum tamping energy at single point.In addition,the electro-osmotic method can efficiently suppress the sharp growth of excess pore water pressure after tamping and promote the quick dissipation of the excess pressure.The electro-osmotic method is better than the well-point dewatering method on the dewatering speed and the soil improvement.Therefore,the double-control dynamic consolidation method has a significant strengthening effect on the improvement of soft clay.