WO2020258426A1 - 一种考虑结构面粗糙度的裂隙岩体稳定性分析系统 - Google Patents

一种考虑结构面粗糙度的裂隙岩体稳定性分析系统 Download PDF

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WO2020258426A1
WO2020258426A1 PCT/CN2019/097071 CN2019097071W WO2020258426A1 WO 2020258426 A1 WO2020258426 A1 WO 2020258426A1 CN 2019097071 W CN2019097071 W CN 2019097071W WO 2020258426 A1 WO2020258426 A1 WO 2020258426A1
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fractured rock
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王述红
朱承金
王鹏宇
张紫杉
邱伟
王帅
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东北大学
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  • the invention belongs to the field of rock mass stability analysis, and in particular relates to a fractured rock mass stability analysis system considering the roughness of structural surfaces.
  • rock stability is a common geotechnical problem in my country's construction projects such as water conservancy and hydropower, roads, railways, and mineral resources development.
  • Rock mass disasters caused by natural landslides, tunnel collapse and human engineering activities have brought huge losses to my country’s economic construction and people’s lives and property. Therefore, the status of rock mass engineering in various engineering constructions is very important.
  • the stability of the body prevents problems before they happen, and can ensure the safety of production and construction and people’s property.
  • rock mass stability analysis the rock mass structural surface is generally assumed to be a plane, but in reality it is a surface with roughness, and it is difficult to measure the cohesive force in actual engineering. Therefore, a method for analyzing rock mass stability from the perspective of roughness is needed. method.
  • the present invention takes into account the influence of roughness on the shear strength of the structural surface when the fractured rock mass undergoes relative displacement along the structural surface, and proposes to introduce the structural surface roughness into the rock mass stability analysis system and analyze it accordingly.
  • the structural plane cuts the fractured rock mass stability analysis model to form a block system. Assign the measured shear strength ⁇ of the structural surface of the rock mass to the structural surface, run the program to analyze the stability of the rock mass, search for the key blocks, and put forward guiding suggestions for the treatment of the key blocks based on the analysis results, which is highly practical It contributes a new method to the stability analysis and treatment of fractured rock mass.
  • JRC structural surface roughness coefficient
  • ⁇ is the effective normal stress
  • ⁇ b is the internal friction angle of the fractured rock mass structural plane
  • JCS is the compressive strength of the structural plane.
  • A, B, and C are plane parameters, and the plane normal vector n can be obtained as (-A,-B,1). Picking up points on the structural surface, any non-collinear n points (n>3), you can get the equation:
  • the present invention has the following beneficial technical effects:
  • the existing fractured rock mass stability analysis system generally uses the laboratory to obtain the shear strength parameters c and Then, the shear strength ⁇ of the discontinuity is determined according to the Mohr-Coulomb strength criterion for rock stability analysis, without considering the discontinuity characteristics of the actual fractured rock mass.
  • the fractured rock mass structural surface is a rough surface with roughness, and its influence on the shear strength of the structural surface should be closely considered. Therefore, a rock mass stability analysis system considering the roughness of the structural surface is proposed.
  • a roughness measuring instrument is used to measure the roughness parameters of the structural surface, obtain the fractal dimension D and the structural surface roughness coefficient JRC, and then calculate the shear strength ⁇ of the structural surface of the rock mass.
  • the structural plane cuts the fractured rock mass stability analysis model to form a block system. Assign the measured shear strength ⁇ of the structural surface of the rock mass to the structural surface, run the program to analyze the stability of the rock mass, search for the key blocks, and put forward guiding suggestions for the treatment of the key blocks based on the analysis results, which is highly practical It contributes a new method to the stability analysis and treatment of fractured rock mass.
  • Figure 1 is a flow chart of the procedure of the fractured rock mass stability analysis system considering the roughness of the structural surface
  • Figure 2 is a schematic diagram of the positions of key blocks calculated by the system of the present invention.
  • a fractured rock mass stability analysis system considering structural surface roughness of the present invention includes the following contents:
  • the engineering fractured rock mass was obtained on site, and the density was 2300kg/m3 and the elastic modulus was 15.2GPa measured by laboratory tests.
  • the roughness measuring instrument measured the average base length L and average height h of the structural surface roughness of the fractured rock mass. The specific values are: the average base length L is 15.2mm, the average height h is 2.92mm,
  • JRC structural surface roughness coefficient
  • ⁇ is the effective normal stress
  • ⁇ b is the internal friction angle of the fractured rock mass structural plane
  • JCS is the compressive strength of the structural plane.
  • ⁇ 10MPa
  • ⁇ b 40 °
  • JCS 100MPa, substituting the data obtained
  • ⁇ 2.36MPa.
  • the three-dimensional model of fractured rock mass and the structural surface information of the slope are measured by UAV multi-level and omni-directional photogrammetry, and the stability analysis model of the fractured rock mass, the coordinate parameters of the slope structural surface and the exposure length are obtained.
  • the dimensions of the stability analysis model are as follows: the length of the top surface is 100m, the width is 20m, the length of the bottom surface is 100m, the width is 30m, and the rock mass height is 100m.
  • A, B, and C are plane parameters, and the plane normal vector n can be obtained as (-A,-B,1). Picking up points on the structural surface, any non-collinear n points (n>3), you can get the equation:
  • the safety factor of the slope under normal conditions when the safety factor of the slope under normal conditions is greater than 1.200, it can be considered to meet the stability requirements.
  • the key blocks that do not meet the stability requirements should be treated as soon as possible.
  • the pre-instability blocks include key block 1, key block 2, key block 4, key block 7, key block 8, and key block 9.
  • the pre-instability key block 2, key block 4, key block 7 and key block 8 with large volume are anchored and supported, and the volume is small or the rock is supported.
  • the pre-instability key block 1 and key block 9 that have little influence on the overall stability of the body are stripped to prevent the rock mass from destabilizing itself and causing major losses.

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Abstract

一种考虑结构面粗糙度的裂隙岩体稳定性分析系统，考虑裂隙岩体沿结构面发生相对位移时粗糙度对结构面抗剪强度的影响，提出将结构面粗糙度导入岩体稳定性分析系统并据此进行分析。先对裂隙岩体进行现场取样，并利用粗糙度测量仪测量结构面粗糙度的平均基长L和平均高度h，据此得到分形维数D及结构面粗糙系数JRC，进而计算出岩体结构面抗剪强度τ。通过无人机多层次全方位摄影测量边坡结构面信息并导入裂隙岩体稳定性分析模型中，将测得的岩体结构面抗剪强度τ赋予到结构面上，进行岩体稳定性分析，搜索出关键块体，对关键块体治理提出指导性建议，实用性强。

Description

一种考虑结构面粗糙度的裂隙岩体稳定性分析系统 技术领域
本发明属于岩体稳定性分析领域，尤其涉及一种考虑结构面粗糙度的裂隙岩体稳定性分析系统。
背景技术
目前，岩体稳定性问题是我国水利水电、公路、铁路和矿产资源开发等建设工程中常见的岩土工程问题。自然滑坡、隧道垮塌及人类工程活动等引起的岩体灾害对我国经济建设和人民生命财产带来了巨大损失，因此岩体工程在各类工程建设中的地位是十分重要的，正确的评价岩体的稳定性，防患于未然，能确保生产建设与人民财产安全。
岩体稳定性分析中一般将岩体结构面假设为平面，而实际其为有粗糙度的面，且实际工程中内聚力较难测得，故需要一种从粗糙度角度分析岩体稳定性的方法。
发明内容
为解决上述技术问题，本发明考虑了裂隙岩体沿结构面发生相对位移时粗糙度对结构面抗剪强度的影响，提出将结构面粗糙度导入岩体稳定性分析系统并据此进行分析。首先对裂隙岩体进行现场取样，并利用粗糙度测量仪测量结构面粗糙度的平均基长L和平均高度h，据此得到分形维数D及结构面粗糙系数JRC，进而计算出岩体结构面抗剪强度参数τ。通过无人机多层次全方位摄影测量边坡结构面信息，得到边坡结构面坐标参数以及出露迹长，并通过最小二乘法计算结构面倾向、倾角，并将结构面信息导入裂隙岩体稳定性分析模型中，结构面切割裂隙岩体稳定性分析模型，形成块体系统。将测得的岩体结构面抗剪强度τ赋予到结构面上，运行程序进行岩体稳定性分析，搜索出关键块体，并根据分析结果对关键块体治理提出指导性建议，实用性强，为裂隙岩体稳定性分析及治理贡献了一种新手段。
具体技术方案如下：
一种考虑结构面粗糙度的裂隙岩体稳定性分析系统，其特征在于，包括以下步骤：
(1)现场获取工程裂隙岩体，室内试验测得其密度、弹性模量，粗糙度测量仪测量裂隙岩体结构面粗糙度的平均基长L和平均高度h；
(2)利用测定的裂隙岩体结构面粗糙度的平均基长L和平均高度h计算岩体结构面的分形维数，即D＝log 104/log 10[2(1+cot -1(2h/L))]；
(3)进而由分形维数确定结构面粗糙系数(JRC)值，
即JRC＝85.2671(D-1) 0.5679；
(4)预测岩体各结构面抗剪强度τ：
τ＝σtan[JRClog 10(JCS/σ)+Φ b]
其中σ为有效法向应力，Φ b为裂隙岩体结构面的内摩擦角，JCS为结构面压缩强度。
(5)通过无人机多层次全方位摄影测量裂隙岩体三维模型和边坡结构面信息，得到裂隙岩体稳定性分析模型、边坡结构面坐标参数以及出露迹长，，假设该结构面平面方程为：
Z＝AX+BY+C
其中A、B、C为平面参数，可得该平面法向量n为(-A,-B,1)。对该结构面进行点的拾取，任意不共线的n个点(n>3)，可以得到方程：
Figure PCTCN2019097071-appb-000001
利用最小二乘法解算(A,B,C)为：
Figure PCTCN2019097071-appb-000002
结构面倾向
Figure PCTCN2019097071-appb-000003
结构面倾角
Figure PCTCN2019097071-appb-000004
(6)将(5)获取的结构面信息导入裂隙岩体稳定性分析模型中，结构面切割裂隙岩体稳定性分析模型，形成块体系统。
(7)将(4)测得的岩体结构面抗剪强度τ赋予到结构面上，程序运算，搜索关键块体，确定关键块体位置、数量及安全系数F s，并对关键块体进行锚固或剥离。
与现有技术相比，本发明具有如下有益技术效果：
现有的裂隙岩体稳定性分析系统一般采用实验室获取结构面抗剪强度参数c和
Figure PCTCN2019097071-appb-000005
后根据摩尔-库伦强度准则确定结构面抗剪强度τ来进行岩体稳定性分析，没有考虑实际裂隙岩体的结构面特征。而裂隙岩体结构面是具有粗糙度的不光滑面，应密切考虑其对结构面抗剪强度的影响，故提出考虑结构面粗糙度的岩体稳定性分析系统。利用粗糙度测量仪测量结构面粗糙度参数，获取分形维数D及结构面粗糙系数JRC，进而计算出岩体结构面抗剪强度τ。通过无人机多层次全方位摄影测量边坡结构面信息，得到边坡结构面坐标参数以及出露迹长，并通过最小二乘法计算结构面倾向、倾角，并将结构面信息导入裂隙岩体稳定性分析模型中，结构面切割裂隙岩体稳定性分析模型，形成块体系统。将测得的岩体结构面抗剪强度τ赋予 到结构面上，运行程序进行岩体稳定性分析，搜索出关键块体，并根据分析结果对关键块体治理提出指导性建议，实用性强，为裂隙岩体稳定性分析及治理贡献了一种新手段。
附图说明
图1为考虑结构面粗糙度的裂隙岩体稳定性分析系统程序步骤流程图；
图2为经本发明系统计算后的关键块体位置示意图。
具体实施方式
下面结合附图对本发明进行详细说明，但本发明的保护范围不受实施例所限。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。
本发明的一种考虑结构面粗糙度的裂隙岩体稳定性分析系统，包括以下内容：
(1)现场获取工程裂隙岩体，室内试验测得其密度为2300kg/m3、弹性模量为15.2GPa，粗糙度测量仪测量裂隙岩体结构面粗糙度的平均基长L和平均高度h，具体数值分别为：平均基长L为15.2mm，平均高度h为2.92mm，
(2)利用测定的裂隙岩体结构面粗糙度的平均基长L和平均高度h计算岩体结构面的分形维数，即D＝log 104/log 10[2(1+cot -1(2h/L))],代入数据得，D＝1.02501；
(3)进而由分形维数确定结构面粗糙系数(JRC)值，
即JRC＝85.2671(D-1) 0.5679，代入数据得，JRC＝10.498；
(4)预测岩体抗剪强度τ：
τ＝σtan[JRClog 10(JCS/σ)+Φ b]
其中σ为有效法向应力，Φ b为裂隙岩体结构面的内摩擦角，JCS为结构面压缩强度。其具体数值如下：σ＝10MPa，Φ b＝40°，JCS＝100MPa，代入数据得，τ＝2.36MPa。
(5)通过无人机多层次全方位摄影测量裂隙岩体三维模型和边坡结构面信息，得到裂隙岩体稳定性分析模型、边坡结构面坐标参数以及出露迹长，，裂隙岩体稳定性分析模型的尺寸如下：顶面长度为100m，宽度为20m，底面长度为100m，宽度为30m，岩体高度为100m。
假设该结构面平面方程为：
Z＝AX+BY+C
其中A、B、C为平面参数，可得该平面法向量n为(-A,-B,1)。对该结构面进行点的拾取，任意不共线的n个点(n>3)，可以得到方程：
Figure PCTCN2019097071-appb-000006
利用最小二乘法解算(A,B,C)为：
Figure PCTCN2019097071-appb-000007
结构面倾向
Figure PCTCN2019097071-appb-000008
结构面倾角
Figure PCTCN2019097071-appb-000009
计算可得结构面产状信息如表1所示：
表1结构面产状信息
Figure PCTCN2019097071-appb-000010
(6)将(5)计算得到的结构面信息导入裂隙岩体稳定性分析模型中，结构面切割裂隙岩体稳定性分析模型，形成块体系统。
(7)将(4)测得的岩体结构面抗剪强度τ＝2.36MPa赋予到结构面上，程序运算，搜索关键块体，确定关键块体位置、数量及安全系数F s，并对关键块体进行锚固或剥离。关键块 体相关信息如表2所示：
表2关键块体相关信息
Figure PCTCN2019097071-appb-000011
根据相关设计规范规定，边坡在正常工况下的安全系数大于1.200时，可认为其满足稳定性要求。相应不满足稳定性要求的关键块体，需尽快对其采取措施进行治理。根据安全系数计算结果，预失稳的块体有关键块体1、关键块体2、关键块体4、关键块体7、关键块体8及关键块体9。
根据图2所表征的关键块体位置，对体积量大的预失稳关键块体2、关键块体4、关键块体7及关键块体8进行锚固支护，对体积量小或对岩体整体稳定性影响较小的预失稳关键块体1及关键块体9进行剥离，避免岩体自行失稳，造成重大损失。
以上所述仅为本发明的较佳实施例，并不用以限制本发明的思想，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (2)

  1. 一种考虑结构面粗糙度的裂隙岩体稳定性分析系统，其特征在于，包括以下步骤：
    (1)现场获取工程裂隙岩体，室内试验测得其密度、弹性模量，粗糙度测量仪测量裂隙岩体结构面粗糙度的平均基长L和平均高度h；
    (2)利用测定的裂隙岩体结构面粗糙度的平均基长L和平均高度h计算岩体结构面的分形维数：
    D＝log 104/log 10[2(1+cot -1(2h/L))]；
    (3)进而由分形维数确定结构面粗糙系数(JRC)值：
    JRC＝85.2671(D-1) 0.5679；
    (4)预测岩体各结构面抗剪强度τ：
    τ＝σtan[JRClog 10(JCS/σ)+Φ b]；
    其中σ为有效法向应力，Φ b为裂隙岩体结构面的内摩擦角，JCS为结构面压缩强度；
    (5)通过无人机多层次全方位摄影测量裂隙岩体三维模型和边坡结构面信息，得到裂隙岩体稳定性分析模型、边坡结构面坐标参数以及出露迹长，假设该结构面平面方程为：Z＝AX+BY+C，其中A、B、C为平面参数，可得该平面法向量n为(-A,-B,1)，对该结构面进行点的拾取，任意不共线的n个点(n>3)，可以得到方程：
    Figure PCTCN2019097071-appb-100001
    利用最小二乘法解算(A,B,C)为：
    Figure PCTCN2019097071-appb-100002
    结构面倾向
    Figure PCTCN2019097071-appb-100003
    结构面倾角
    Figure PCTCN2019097071-appb-100004
    (6)将(5)获取的结构面信息导入裂隙岩体稳定性分析模型中，结构面切割裂隙岩体稳定性分析模型，形成块体系统；
    (7)将(4)测得的岩体结构面抗剪强度τ赋予到结构面上，程序运算，搜索关键块体，确定关键块体位置、数量及安全系数F s，并对关键块体进行锚固或剥离。
  2. 根据权利要求1所述的考虑结构面粗糙度的裂隙岩体稳定性分析系统，其特征在于：可根据所述关键块体安全系数F s大小判定边坡稳定性，安全系数越大，则块体稳定性越好。
PCT/CN2019/097071 2019-06-27 2019-07-22 一种考虑结构面粗糙度的裂隙岩体稳定性分析系统 WO2020258426A1 (zh)

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