Application of phase space reconstruction and v-SVR algorithm in predicting displacement of underground engineering surrounding rock

A new method for predicting the trend of displacement evolution of surroundingrock was presented in this paper.According to the nonlinear characteristics of displace-ment time series of underground engineering surrounding rock,based on phase spacereconstruction theory and the powerful nonlinear mapping ability of support vector ma-chines,the information offered by the time series datum sets was fully exploited and thenon-linearity of the displacement evolution system of surrounding rock was well described.The example suggests that the methods based on phase space reconstruction and modi-fied v-SVR algorithm are very accurate,and the study can help to build the displacementforecast system to analyze the stability of underground engineering surrounding rock.

厚煤层分层采动直覆砂岩运移规律研究

为分析厚煤层分层开采后直覆砂岩顶板岩层移动规律,以顾北矿A组煤南-1采区13121上工作面为工程背景,采用物理相似试验和理论分析相结合的方式对顾北矿厚煤层分层开采覆岩运动进行了研究。通过构建分层开采覆岩的结构力学模型,得出覆岩荷载计算公式。研究结果表明:直接顶垮落步距为85 m;工作面前方18~20 m处实体煤处于支承压力峰值,下分层应力峰值范围为19.07~23.35 MPa、上分层应力峰值范围为17.98~20.98 MPa;11.6 m厚细砂岩层及其下部岩层发生破坏,失去对其上覆岩层的承载能力,导致下分层的应力峰值大于上分层;上分层裂隙带高度为32 m,垮落带高度为17 m,下分层裂隙带高度为40 m,垮落带高度为23 m,下分层垮落范围比上分层发育。为顾北矿分层开采提供参考依据。