筑堤清滩土石料大型抗剪强度试验研究
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摘要
以广东省韶关市某中小河流治理工程的清滩土石料为研究对象,开展室内大型三轴剪切试验和大型直剪试验,研究不同试验方法下清滩土石料的抗剪强度特性。大型三轴剪切试验结果表明,清滩土石料强度随着应变的增加逐渐增加,无明显峰值强度,为弱硬化型,同时抗剪强度随着围压的增大而增大,体应变呈剪缩型变化;大型直剪试验结果表明,土石混合料在不同垂直压力下均具有一定的峰值强度,呈现微弱的应变软化特性;不同试验方法确定的清滩土石料抗剪强度参数对比结果为,大型三轴剪切试验所得到的抗剪强度参数最大,大型常规直剪试验次之,大型叠环式剪切试验最小。研究成果表明,清滩土石料具有较好的抗剪强度,防渗处理好后可作为较好的筑堤材料。
The shear strength characteristics of earth-rock material from river dredging obtained from different test methods are examined via large-scale indoor triaxial shear test and direct shear test. The earth-rock material from river dredging in the harnessing project of a small and medium-sized river in Shaoguan,Guangdong Province is taken as a case study. The results of large-scale triaxial shear test show that the shear strength of the earth-rock material from river dredging increases with the rising of strain and confining pressure,displaying weak hardening with no obvious peak strength. The results of large-scale direct shear test show that peak strength of the earth-rock material from river dredging exists under different vertical pressures,characterized by a weak strain softening. Comparison of shear strength parameters among different test methods implies that the shear strength parameters obtained from large-scale triaxial shear test is the largest,followed by those of conventional direct shear test and piled ring shear test in sequence. The research results prove that the earth-rock material from river dredging is of good shear strength,hence can be used as good embankment material after anti-seepage treatment.
The shear strength characteristics of earth-rock material from river dredging obtained from different test methods are examined via large-scale indoor triaxial shear test and direct shear test. The earth-rock material from river dredging in the harnessing project of a small and medium-sized river in Shaoguan,Guangdong Province is taken as a case study. The results of large-scale triaxial shear test show that the shear strength of the earth-rock material from river dredging increases with the rising of strain and confining pressure,displaying weak hardening with no obvious peak strength. The results of large-scale direct shear test show that peak strength of the earth-rock material from river dredging exists under different vertical pressures,characterized by a weak strain softening. Comparison of shear strength parameters among different test methods implies that the shear strength parameters obtained from large-scale triaxial shear test is the largest,followed by those of conventional direct shear test and piled ring shear test in sequence. The research results prove that the earth-rock material from river dredging is of good shear strength,hence can be used as good embankment material after anti-seepage treatment.
引文
[1]吴锐,邓清禄,付敏,等.碎石尺寸对碎石土强度影响的大型直剪试验研究[J].长江科学院院报,2016,33(8):80-85.
[2]杨继红,董金玉,黄志全,等.不同含石量条件下堆积体抗剪强度特性的大型直剪试验研究[J].岩土工程学报,2016,38(增2):161-166.
[3]王青志,朱鑫鑫,刘建坤,等.寒区高速铁路路基粗颗粒填料大型直剪试验研究[J].铁道学报,2016,38(8):102-109.
[4]曹文贵,黄文健,王江营,等.土石混填体变形力学特性大型三轴试验研究[J].湖南大学学报(自然科学版),2016,43(3):142-148.
[5]姜景山,程展林,卢文平,等.基于大型三轴排水剪切试验的粗粒土强度特性研究[J].水电能源科学,2014,32(7):109-112.
[6]姜景山,程展林,左永振,等.粗粒土剪胀性大型三轴试验研究[J].岩土力学,2014,35(11):3129-3138.
[7]余明东,钱波,何仕海.黏性粗粒土压实特性试验研究[J].人民黄河,2015,37(6):99-101.
[8]周志军,南浩林,孟梅.土石混合料大型击实试验研究[J].路基工程,2007,(5):95-96.
[9]SL 237-1999,土工试验规程[S].北京:中国水利水电出版社,1999.
[10]朱晟,王永明,翁厚洋.粗粒筑坝材料密实度的缩尺效应研究[J].岩石力学与工程学报,2011,30(2):348-357.
[11]朱俊高,翁厚洋,吴晓铭,等.粗粒料级配缩尺后压实密度试验研究[J].岩土力学,2010,31(8):2394-2398.
[12]左永振,张伟,潘家军,等.粗粒料级配缩尺方法对其最大干密度的影响研究[J].岩土力学,2015,36(增1):417-422.
[2]杨继红,董金玉,黄志全,等.不同含石量条件下堆积体抗剪强度特性的大型直剪试验研究[J].岩土工程学报,2016,38(增2):161-166.
[3]王青志,朱鑫鑫,刘建坤,等.寒区高速铁路路基粗颗粒填料大型直剪试验研究[J].铁道学报,2016,38(8):102-109.
[4]曹文贵,黄文健,王江营,等.土石混填体变形力学特性大型三轴试验研究[J].湖南大学学报(自然科学版),2016,43(3):142-148.
[5]姜景山,程展林,卢文平,等.基于大型三轴排水剪切试验的粗粒土强度特性研究[J].水电能源科学,2014,32(7):109-112.
[6]姜景山,程展林,左永振,等.粗粒土剪胀性大型三轴试验研究[J].岩土力学,2014,35(11):3129-3138.
[7]余明东,钱波,何仕海.黏性粗粒土压实特性试验研究[J].人民黄河,2015,37(6):99-101.
[8]周志军,南浩林,孟梅.土石混合料大型击实试验研究[J].路基工程,2007,(5):95-96.
[9]SL 237-1999,土工试验规程[S].北京:中国水利水电出版社,1999.
[10]朱晟,王永明,翁厚洋.粗粒筑坝材料密实度的缩尺效应研究[J].岩石力学与工程学报,2011,30(2):348-357.
[11]朱俊高,翁厚洋,吴晓铭,等.粗粒料级配缩尺后压实密度试验研究[J].岩土力学,2010,31(8):2394-2398.
[12]左永振,张伟,潘家军,等.粗粒料级配缩尺方法对其最大干密度的影响研究[J].岩土力学,2015,36(增1):417-422.