1.机械工业勘察设计研究院有限公司 陕西省特殊土性质与处理重点实验室,陕西 西安 710043
2.中联西北工程设计研究院有限公司,陕西 西安 710077
3.西安建筑科技大学土木工程学院,陕西 西安 710055
4.同济大学地下建筑与工程系,上海 200092
于永堂(1983—),男,高级工程师,博士。主要从事岩土工程测试与装备、特殊土工程性质评价与地基处理技术的开发与应用研究。E‑mail:yuyongtang@126.com
收稿:2021-06-06,
修回:2021-11-19,
纸质出版:2022-10-28
移动端阅览
于永堂,朱建民,郑建国等.黄土钻孔剪切变形与强度特性研究[J].防灾减灾工程学报,2022,42(05):1104-1112.
YU Yongtang,ZHU Jianmin,ZHENG Jianguo,et al.Study on Deformation and Strength Characteristics of Xi'an Loess by Borehole Shear Tests[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(05):1104-1112.
于永堂,朱建民,郑建国等.黄土钻孔剪切变形与强度特性研究[J].防灾减灾工程学报,2022,42(05):1104-1112. DOI: 10.13409/j.cnki.jdpme.20210606001.
YU Yongtang,ZHU Jianmin,ZHENG Jianguo,et al.Study on Deformation and Strength Characteristics of Xi'an Loess by Borehole Shear Tests[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(05):1104-1112. DOI: 10.13409/j.cnki.jdpme.20210606001.
为揭示黄土钻孔剪切过程的变形和强度特征,在传统钻孔剪切仪上增加法向位移和剪切位移传感器,并采用改进的钻孔剪切仪在典型西安黄土中进行不同深度的钻孔剪切试验,同时在相邻探井内取原状土样进行三轴固结不排水剪切试验和直剪试验(固结快剪、快剪),最后将不同试验方法测得的抗剪强度参数进行对比分析。试验结果表明,法向应力‑法向位移关系曲线可通过刺入压密阶段、似弹性变形阶段和塑性变形阶段描述其特征;在首级法向应力下的剪切破坏过程中,剪切应力历经短期弹性、长期弹塑性增大阶段,直至达到相对稳定值;在分级法向应力下的剪切破坏过程中,剪切应力历经从零增大至比例强度的弹性阶段,从比例强度增大至峰值强度的弹塑性阶段和从峰值强度降低至残余强度的屈服破坏阶段;当法向应力控制在似弹性变形阶段范围时,剪切应力与法向应力之间呈良好的线性关系,较好地符合摩尔‑库伦强度准则;钻孔剪切试验测得的内摩擦角普遍高于三轴固结不排水剪切试验和直剪试验(固结快剪、快剪)结果,但黏聚力除在浅部地层(10 m深度范围内)中高于直剪试验(固结快剪、快剪)结果外,均小于三轴固结不排水剪切试验和直剪试验(固结快剪、快剪)结果。
In order to reveal the deformation and strength characteristics of loess in the process of Borehole Shear Tests (BST), the normal displacement sensor and shear displacement sensor were installed in the traditional borehole shear instrument, and the modified borehole shear instrument was applied to the BSTs at different depths in a typical loess stratum, Xi'an. Meanwhile, undisturbed soil samples were taken from the adjacent exploration well for triaxial consolidated undrained shear tests, and consolidated and unconsolidated quick direct shear tests. Finally, the shear strength parameters measured by different test methods are compared and analyzed. The test results show that the relation curve of normal stress versus normal displacement can be described by the penetration-compaction stage, quasi-elastic deformation stage, and plastic deformation stage. The shear failure process under the first normal pressure goes through the short-term elastic stage and the long-term elastic-plastic stage until it reaches the relatively stable shear strength. The shear failure process under the increments of normal pressure goes through the elastic stage when the shear stress increases from zero to the proportional strength, the elastic-plastic stage when the proportional strength increases to the peak strength, and the yield failure stage when the peak strength decreases to the residual strength. When the normal stress is in the range of quasi-elastic deformation stage, there is a good linear relationship between the shear stress and the normal stress, which conforms to the Mohr-Coulomb strength criterion; The internal friction angles measured by BSTs are generally higher than those of triaxial consolidated undrained shear tests, consolidated and unconsolidated quick direct shear tests, but the cohesions are lower than those of triaxial consolidated undrained shear tests and direct shear tests except that it is higher than that of direct shear tests in shallow stratum (within 10 m depth).
刘祖典 . 黄土力学与工程 [M]. 西安 : 陕西科学技术出版社 , 1997 : 1 ‑ 25 .
Liu Z D . Loess mechanics and engineering [M]. Xi΄an : Shaanxi Science and Technology Press , 1997 : 1 ‑ 25 . (in Chinese)
沈小克 , 蔡正银 , 蔡国军 . 原位测试技术与工程勘察应用 [M]. 土木工程学报 , 2016 , 49 ( 2 ): 98 ‑ 120 .
Shen X K , Cai Z Y , Cai G J . Applications of in‑situ tests in site characterization and evaluation [M]. China Civil Engineering Journal , 2016 , 49 ( 2 ): 98 ‑ 120 . (in Chinese)
Handy R L , Fox N S . A soil borehole direct shear test device [J]. Transportation Research Record , 1967 , 27 : 42 ‑ 51 .
Lutenegger A J , Timian D A . Reproducibility of borehole shear test results in marine clay [J]. Geotechnical Testing Journal , 1987 , 10 ( 1 ): 13 ‑ 18 .
Drnevich V P . Suggested method for performing the borehole shear test [J]. Geotechnical Testing Journal , 1987 , 10 ( 1 ): 19 ‑ 25 .
Hong Y , White D J , Schaefer V R . In‑Situ borehole shear test and rock borehole shear test for slope investigation [C]∥ Geoshanghai International Conference , Shanghai , 2006 : 293 ‑ 298 .
Handy R L , Schmertmann J H , Lutenegger A J . Borehole shear tests in a shallow marine environment . In: Chaney, R.C., Demars, K.R. (eds.) Strength Testing of Marine Sediments: Laboratory and In‑Situ Measurements[M]. Philadelphia: ASTM STP 883 , 1985 : 140 ‑ 153 .
Lutenegger A J , Remmes B D , Handy R L . Borehole shear test for stiff soils [J]. Journal of the Geotechnical Engineering Division , 1978 , 104 (NGT 11 ): 1403 ‑ 1407 .
Lutenegger A J , Adams M T . Tension tests on bored piles in residual soil [J]. Geotechnical Special Publication , 1999 , 92 : 43 ‑ 53 .
Miller G A , Azad S , Hassell C E . Iowa borehole shear testing in unsaturated soil [J]. Geotechnical Site Characterization , 1998 , 2 ( 1 ): 1321 ‑ 1326 .
White D J , Handy R L . Preconsolidation pressures and soil moduli from borehole shear tests [C]∥ Proceedings from International Conference on In Situ Measurement of Soil Properties and Case Histories , Bali , 2001 .
Abdelsalam S S , Suleiman M T , Sritharan S . Enhanced load‑transfer analysis for friction piles using a modified borehole shear test [J]. Geotechnical Testing Journal , 2012 , 35 ( 6 ): 1 ‑ 11 .
于永堂 , 郑建国 , 刘争宏 , 等 . 钻孔剪切试验及其在黄土中的应用 [J]. 岩土力学 , 2016 , 37 ( 12 ): 3635 ‑ 3641 .
Yu Y T , Zheng J G , Liu Z H , et al . Borehole shear test and its application to loess [J]. Rock and Soil Mechanics , 2016 , 37 ( 12 ): 3635 ‑ 3641 . (in Chinese)
李晶晶 , 孔令伟 , 穆坤 . 膨胀土原位孔内剪切试验与强度响应特征 [J]. 岩土力学 , 2017 , 38 ( 2 ): 453 ‑ 461 .
Li J J , Kong L W , Mu K . In‑situ borehole shear test on expansive soil and its strength characteristics [J]. Rock and Soil Mechanics , 2017 , 38 ( 2 ): 453 ‑ 461 . (in Chinese)
安然 , 孔令伟 , 张先伟 . 残积土孔内剪切试验的强度特性及广义邓肯–张模型研究 [J]. 岩土工程学报 , 2020 , 42 ( 9 ): 1723 ‑ 1732 .
An R , Kong L W , Zhang X W . Mechanical properties and generalized Duncan‑Chang model for granite residual soils using borehole shear tests [J]. Chinese Journal of Geotechnical Engineering , 2020 , 42 ( 9 ): 1723 ‑ 1732 . (in Chinese)
冯文凯 , 易小宇 , 白慧林 , 等 . 原位钻孔剪切试验及其在残坡积土中的应用 [J]. 科学技术与工程 , 2017 , 17 ( 34 ): 289 ‑ 293 .
Feng W K , Yi X Y , Bai H L , et al . In‑situ borehole shear test and its application in residual slop soil [J]. Science Technology and Engineering , 2017 , 17 ( 34 ): 289 ‑ 293 . (in Chinese)
张建经 , 马东华 , 曾鹏毅 , 等 . 新型便携式钻孔剪切仪研发与测试分析 [J]. 重庆交通大学学报(自然科学版) , 2019 , 38 ( 11 ): 90 ‑ 97 .
Zhang J J , Ma D H , Zeng P Y , et al . Development and test analysis of a new portable borehole shear equipment [J]. Journal of Chongqing Jiaotong University(Natural Science) , 2019 , 38 ( 11 ): 90 ‑ 97 . (in Chinese)
陈俊新 . 基于原位钻孔剪切试验的填方边坡治理数值模拟—以南平开元房地产边坡为例 [D]. 北京 : 中国地质大学(北京) , 2018 : 26 ‑ 45 .
Cheng J X . Numerical study of the control of a backfill slope based on in‑situ borehole shear test‑take Nanping—Kaiyuan real estate slope for example [D]. Beijing : China University of Geosciences (Beijing) , 2018 : 26 ‑ 45 . (in Chinese)
GB 50021—2001 岩土工程勘察规范 [S]. 北京 : 中国建筑工业出版社: 2009 .
赵景波 . 黄土形成过程的实质与环境 [J]. 干旱区地理 , 2000 , 23 ( 4 ): 315 ‑ 319 .
Zhao J B . Essence and environment of loess formation [J]. Arid Land Geography , 2000 , 23 ( 4 ): 315 ‑ 319 . (in Chinese)
赵景波 . 西北黄土区第四纪土壤与环境 [M]. 西安 : 陕西科学技术出版社 , 1994 : 141 ‑ 161 .
Zhao J B . Soil and environment of quaternary in northwest loess areas [M]. Xi'an : Shaanxi Science and Technology Press , 1994 : 141 ‑ 161 . (in Chinese)
Handy R L . Borehole shear test manual [M]. Madrid, Iowa, USA : Handy Geotechnical Instruments, Inc. , 2009 : 1 ‑ 10 .
0
浏览量
0
下载量
0
CSCD
关联资源
相关文章
相关作者
相关机构
苏公网安备32010202012147号
