深部土K0参量在井壁稳定性验算中的研究

APPLICATION OF K0 PARAMETER OF DEEP BURIED SOILS IN CHECKING COMPUTATION OF SHAFT STABILITY

水平地压计算方式考虑了土的天然特性,利用自行设计的高压K0蠕变试验系统试验得到深部土的K0参量,作为研究山东省巨野矿区埋深近700m的巨厚土层中煤矿立井水平地压大小计算参数,模拟实际状况。分析表明,在厚表土地区进行井筒建设中,由于含水层失水造成井壁竖向附加应力的存在,所以在该类地区进行井筒建设时,不但要进行环向稳定性验算,还应该进行竖向稳定性验算,该类地区井筒破坏主要是由于竖向附加应力引起的。

Natural feature of soils is considered during calculation of horizontal geopressure. K0 parameter gained from the high - pressure creep equipment is used to calculate horizontal stress of shaft lining with nearly 700 m buried soils in the Juye coal mine, Shandong province. Analyses prove that there exists a vertical additional stress due to dehydration of aquifer during shaft construction in a thick regolith area. Checking computations of the vertical stability and the hoop stability are needed. Destruction of shaft is mainly caused by vertical additional stress.