三向应力下土体水力劈裂的破坏机理及适用性探讨

›› 2006, Vol. 27 ›› Issue (S2): 66-70.

三向应力下土体水力劈裂的破坏机理及适用性探讨

章定文，刘松玉

东南大学岩土工程研究所，南京 210096

收稿日期:2006-07-20 发布日期:2006-12-16
作者简介:章定文，男，1978年生，博士研究生，主要从事特殊土加固、路基工程等方面研究
基金资助:
东南大学优秀博士学位论文基金项目（NO. YBJJ0603）。

Mechanism of hydraulic fracture of foil under three dimensional its stress state and applicability

ZHANG Ding-wen, LIU Song-yu

Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China

Received:2006-07-20 Published:2006-12-16

摘要/Abstract

摘要： 土体中的水力劈裂破坏机理存在两种观点：张拉破坏机理和剪切破坏机理。前人已经对其进行了大量地研究，并分别基于两种破坏机理提出了起劈压力的理论计算式，但是对其适用性没有进一步探讨。分别分析三向应力状态下土体水力劈裂的张拉破坏和剪切破坏判定准则，并基于Mohr-Coulomb屈服准则分析两种破坏机理的适用条件。分析结果表明，土体的水力劈裂是张拉破坏还是剪切破坏与小主应力σ3和不排水抗剪强度cu的大小密切相关，当小主应力σ3较大且不排水抗剪强度cu较小时，土体的劈裂多受剪切破坏机理控制；反之，土体的劈裂为张拉破坏。最后通过已有文献中的试验结果验证了所提出的两种破坏机理适用条件的合理性。

关键词: 水力劈裂, 张拉破坏机理, 剪切破坏机理, 适用条件, 小主应力, 不排水抗剪强度

Abstract: There are two kinds of standpoints on the mechanism of hydraulic fracturing of soils, that are tensile failure and shear failure. Vast studies on the fracture mechanism as well as the corresponding theoretical formula of the fracture pressure appeared in literatures, however, their explicabilities were still not yet fully discussed. The computing methods of the fracture pressures for tensile failure and shear failure in three dimensional stress states are put forward in this paper. Base on Mohr-Coulomb failure criterion, the applicability of the proposed fracturing pressure calculating method is discussed. The results indicate that the hydraulic fracture criterion is related to the minor principal stress and undrained shear strength of soil; and the possibility of shear failure increases with the minor principal stress σ3 increasing. The hydraulic fracture test results in literatures verify the applicability of the proposed method.

Key words: hydraulic fracture, tensile failure mechanism, shear failure mechanism, applicability, minor principal stress

中图分类号:

TU 411.3

章定文，刘松玉. 三向应力下土体水力劈裂的破坏机理及适用性探讨[J]. , 2006, 27(S2): 66-70.

ZHANG Ding-wen, LIU Song-yu. Mechanism of hydraulic fracture of foil under three dimensional its stress state and applicability [J]. , 2006, 27(S2): 66-70.

参考文献

相关文章 15

[1]	邱敏, 袁青, 李长俊, 肖超超, . 基于孔穴扩张理论的黏土不排水抗剪强度计算方法对比研究[J]. 岩土力学, 2019, 40(3): 1059-1066.
[2]	郑安兴, 罗先启, 陈振华, . 基于扩展有限元法的岩体水力劈裂耦合模型[J]. 岩土力学, 2019, 40(2): 799-808.
[3]	李东奇，李宗利，吕从聪. 考虑裂隙附加水压的岩体断裂强度分析[J]. , 2018, 39(9): 3174-3180.
[4]	张坤勇，李威，Charkley Nai Frederick，陈恕,. 小主应力方向加载条件下的掺砾黏土真三轴试验[J]. , 2018, 39(9): 3270-3276.
[5]	郑安兴，罗先启，. 危岩水力劈裂分析的扩展有限元法[J]. , 2018, 39(9): 3461-3468.
[6]	杨石扣，任旭华，张继勋，. 基于数值流形法的重力坝水力劈裂研究[J]. , 2018, 39(8): 3055-3060.
[7]	蒋水华，曾绍慧，杨建华，姚池，黄劲松，周创兵,. 不排水抗剪强度非平稳随机场模拟及边坡可靠度分析[J]. , 2018, 39(3): 1071-1081.
[8]	杨石扣，任旭华，张继勋，. 改进的数值流形法在水力劈裂中的应用[J]. , 2018, 39(10): 3875-3881.
[9]	王进，朱泽奇，陈健，付晓东，房强, . 海相沉积软土的自钻式旁压试验及原位力学特性[J]. , 2017, 38(S1): 195-202.
[10]	刘美麟，房倩，张顶立，侯艳娟. 深基坑内撑式支护结构综合刚度研究[J]. , 2017, 38(7): 2059-2064.
[11]	郭小青，朱斌，刘晋超，熊根，黄根清 , . 珠江口海洋软土不排水抗剪强度及循环弱化特性试验研究[J]. , 2016, 37(4): 1005-1012.
[12]	石路杨，李建，许晓瑞，余天堂,. 水力劈裂对岩体中自然裂纹的影响研究[J]. , 2016, 37(10): 3003-3010.
[13]	闫澍旺，李嘉，贾沼霖，孙立强 , . 海洋石油平台超长桩拒锤分析及工程实例[J]. , 2015, 36(S2): 559-564.
[14]	袁俊平，王启贵 , . 水力劈裂楔劈效应试验研究[J]. , 2015, 36(12): 3360-3364.
[15]	赵延林，彭青阳，万文，王卫军，张盛国 , . 高水压下岩体裂纹扩展的渗流-断裂耦合机制与数值实现[J]. , 2014, 299(2): 556-564.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed