岩土体参数约束随机场解析模拟方法及边坡可靠度分析

doi:10.13722/j.cnki.jrme.2017.0981

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摘要约束随机场模型可充分利用有限的现场试验数据和监测资料等，较真实地表征岩土体参数空间变异性。提出岩土体参数二维各向异性约束随机场解析模拟方法，结合边坡可靠度分析给出计算流程，并基于2个钻孔的不排水抗剪强度现场试验数据建立约束随机场模型更新边坡可靠度评价。通过不排水饱和黏土边坡算例验证了提出方法的有效性，并探讨钻孔位置与钻孔布置方案对边坡可靠度的影响规律。结果表明：提出方法不仅可以充分利用有限的现场试验数据真实地表征岩土体参数空间变异性，而且所获得的岩土体参数约束随机场能够有效反映岩土体参数的均值和标准差沿埋深逐渐增加的内在特性，使得边坡可靠度评价结果更加接近工程实际。钻孔位置与钻孔布置方案对边坡可靠度均具有一定的影响，在坡趾附近区域钻孔取样获得的现场试验数据可对边坡可靠度评价提供更多的信息量。

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	蒋水华1
	2
	曾绍慧1
	潘嘉铭1
	姚池1
	杨建华1
	周创兵1

关键词 ：边坡工程, 可靠度, 不排水抗剪强度, 空间变异性, 约束随机场, 钻孔布置方案

Abstract：Conditional random field model can make best use of limited site investigation data to characterize the spatial variation of rock and soil properties more realistically. This paper aims to propose an analytical approach to simulate the 2D anisotropic conditional random field of rock and soil parameters. The procedure of implementation of the proposed approach is presented. A 2D conditional random field model based on the undrained shear strength is constructed and the slope reliability is updated based on the data of field vane shear tests from two boreholes. Then，an example of a clay slope under the undrained conditions is investigated to demonstrate the effectiveness of the proposed approach. The effects of the borehole location and layout scheme of boreholes on the slope reliability are also explored. The results indicate that the proposed approach can fully incorporate the limited site investigation data into the modelling of conditional random fields and realistic characterization of the spatial variation of rock and soil parameters. The obtained realizations of the 2D conditional random field by the proposed approach can reflect the inherent trends of increasing of means and standard deviations of rock and soil parameters with the depth，which make the results of slope reliability analysis more consistent with the engineering practice. The borehole locations and layout scheme of boreholes have the important influences on the slope reliability. The site specific test data acquired from the boreholes which are located in the vicinity of the slope toe can provide more value of information to the evaluation of slope reliability.

Key words： slope engineering reliability undrained shear strength spatial variability conditional random field layout scheme of boreholes

引用本文:

蒋水华1，2，曾绍慧1，潘嘉铭1，姚池1，杨建华1，周创兵1. 岩土体参数约束随机场解析模拟方法及边坡可靠度分析[J]. 岩石力学与工程学报, 2018, 37(3): 642-651.
JIANG Shuihua1，2，ZENG Shaohui1，PAN Jiaming1，YAO Chi1，YANG Jianhua1，ZHOU Chuangbing1. Slope reliability analysis based on analytical simulation of conditional random fields of rock and soil parameters. , 2018, 37(3): 642-651.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0981 或 http://www.rockmech.org/CN/Y2018/V37/I3/642

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