重塑黄土的钻孔剪切变形与强度特性研究

doi:10.13722/j.cnki.jrme.2021.0457

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (1202 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract The Borehole Shear Test(BST) provides direct determination of friction angle and cohesion of soils in-situ. In recent years，BST has been gradually used to in-situ shear test for soil investigations in China. In order to reveal the deformation and strength characteristics of remolded loess by BST，the normal displacement and shear displacement observation system are added to modify the traditional BST apparatus，the model test device for BST is designed，and the influence law of shear strength parameters test results caused by the initial normal stress，normal stress increments，consolidation time and testing procedures are discussed. On this basis，the method of adjusting the test control parameters according to the shear characteristics of the tested soil layer is proposed，which can be used to guide the in-situ BSTs of loess foundation treated by cushion method and compaction method. The test results show that the normal displacement curve includes initial deformation section，quasi elastic deformation section and plastic deformation section；The shear displacement curve includes quasi elastic increasing section，plastic deformation section and shear failure section；The normal pressure applied should be controlled in the range of quasi elastic deformation section；There is no significant difference of the shear strength parameters which measured by the multi-stage testing(MT) and single-stage testing(ST)，and the measured cohesion by MT is 2.3–3.5 kPa smaller than ST，and the measured internal friction angle by MT is 0.8°–2.4° larger than ST.

Key words： soil mechanics remolded loess borehole shear test shear deformation shear strength

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	YU Yongtang1
	2
	3
	ZHANG Long1
	ZHENG Jianguo1
	2
	HUANG Xiaowei1

Cite this article:

YU Yongtang1,2,3, et al. Study on deformation and strength characteristics of remolded loess by borehole shear test[J]. , 2021, 40(S2): 3367-3378.

URL:

http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0457 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/IS2/3367

[5]	LUTENEGGER A J，ADAMS M T. Tension tests on bored piles in residual soil[J]. Geotechnical Special Publication，1999，92：43-53.
[2]	常士骠，张苏民. 工程地质手册[M]. 4版. 北京：中国建筑工业出版社，2006：251-252.(CHANG Shibiao，ZHANG Sumin. Engineering geology handbook[M]. 4th ed. Beijing：China Architecture and Building Press，2006：251-252.(in Chinese))
[4]	LUTENEGGER A J，REMMES B D，HANDY R L. Borehole shear test for stiff soils[J]. Journal of the Geotechnical Engineering Division，1978，104(GT11)：1 403-1 407.
[8]	YANG H，WHITE D J，SCHAEFER V R. In-situ borehole shear tests and rock borehole shear test for slope investigation[J]. Site and Geomaterial Characterization，2006，ASCE GSP 149：293-299.
[10]	LUTENEGGER A J. Suggested method for performing the borehole shear test[J]. Geotechnical Testing Journal，1987，10(1)：19-25.
[12]	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 Jingjing，KONG Lingwei，MU Kun. In-situ borehole shear test on expansive soil and its strength characteristics[J]. Rock and Soil Mechanics，2017，38(2)：453-461.(in Chinese))
[14]	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 Jianjing，MA Donghua，ZENG Pengyi，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))
[3]	LUTENEGGER A J，TIMIAN D A. Reproducibility of borehole shear test results in marine clay[J]. Geotechnical Testing Journal，1987，10(1)：13-18.
[7]	HANDY R L，SCHMERTMANN J H，LUTENEGGER A J. Borehole shear tests in a shallow marine environment[M]. Philadelphia：ASTM STP 883 Strength Testing of Marine Sediments：Laboratory and In-situ Measurements，1985：140-153.
[13]	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)：1 723-1 732. (AN Ran，KONG Lingwei，ZHANG Xianwei. Mechanical properties and generalized Duncan-Chang model for granite residual soils using borehole shear tests[J]. Chinese Journal of Geotechnical Engineering，2020，42(9)：1 723-1 732.(in Chinese))
[15]	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[硕士学位论文][D]. 北京：中国地质大学(北京)，2018：26-45.(CHEN Junxin. Numerical study of the control of a backfill slope based on in-situ borehole shear test-take Nanping—Kaiyuan real estate slope for example[M. S. Thesis][D]. Beijing：China University of Geosciences(Beijing)，2018：26-45.(in Chinese))
[1]	HANDY R L，FOX N S. A soil borehole direct shear test device[J]. Transportation Research Record，1967，27：42-51.
[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)：3 635-3 641.(YU Yongtang，ZHENG Jianguo，LIU Zhenghong，et al. Borehole shear test and its application to loess[J]. Rock and Soil Mechanics，2016，37(12)：3 635-3 641.(in Chinese))
[6]	MILLER G A，AZAD S，HASSELL C E. Iowa borehole shear testing in unsaturated soil[J]. Geotechnical Site Characterization，1998，2(1)：1 321-1 326.
[9]	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.
[16]	张冬霁，卢廷浩. 一种土与结构接触面模型的建立及其应用[J]. 岩土工程学报，1998，20(6)：62-66.(ZHANG Dongji，LU Tinghao. Establishment and application of a interface model between soil and structure[J]. Chinese Journal of Geotechnical Engineering，1998，20(6)：62-66.(in Chinese))