结构面是岩质边坡稳定性的控制性因素,其可在坡体中组合形成潜在失稳块体,基于块体理论和运动学分析可搜索确定块体边界,但块体边界的正确性及岩块稳定性计算结果的准确性取决于地形的精确性.本文以实际工程边坡为例,基于等高线数据,采用Siemens Unigrphics NX10.0软件参数化方法建立了精细地形模型,进一步运用AutoCAD搜索了潜在失稳块体,并计算了块体稳定性系数.结果表明:岩层产状③、④可能在局部区域形成了独立块体,若组合同倾向陡倾结构面,则形成独立块体的可能性大增;若产状③倾角增大,则形成块体的可能性降低.各种块体的稳定性均满足设计要求,仅在施工扰动结构面粘聚力完全丧失的条件下,局部块体的安全系数略低于设计值.因此,建议在施工中保护好结构面粘聚力.%Structure plane which is combined to form unstable rock blocks is the controlling factor of stability of rock slope.Based on the block theory and the kinematic analysis,the boundary of blocks can be searched and determined,while the correctness of the blocks boundary and the accuracy of calculation results of slope stability depend on the fine terrain.Taking a practical slope as an example,Siemens Unigrphics NX10.0 software parametric method was used to establish the fine solid models and then AutoCAD was used to search the potential failure block and calculate the stability coefficient of the block based on the contour vector data.The results show that the attitude of rocks in No.3 and No.4 may have formed independent blocks in local areas.The possibility of forming independent blocks increases greatly if all the combinations lean towards steep-inclined structural planes.If the dip angle of No.3 increases,the possibility of block formation decreases.The stability of all blocks meets the design requirements,and the local block safety factor is slightly lower than the design value only when the cohesion of the construction disturbance surface losses completely.As a result,it is suggested that more attention should be paid to the protection of the cohesion of the construction disturbance surface.
展开▼
