采用钻探、地球物理勘探、波速测量等方法,查明场地工程地质特征,评价了场地稳定性、地基均匀性和地震稳定性.采用赤平极射投影法定性分析开挖边坡最不利的岩土结构面,并利用圆弧滑动法对保留山体边坡和回填边坡的稳定性作出评价.结果表明:工程场地稳定性好,开挖边坡结构面组合交线倾角大于坡面,整体属于稳定型;保留山体边坡稳定安全系数符合规范允许值;回填边坡采用抗滑桩处理后,边坡稳定安全系数为1.436,满足规范要求,施工期基底沉降量最大值约250 mm.
Stability evaluation and engineering geological characteristics of a precision instrument factory site
To find out the engineering geological characteristics of a precision instrument construction project,applications were made of drilling,geophysical exploration and wave velocity measurement.The stability of the site,uniformity of the foundation,and seismic stability were evaluated.The most unfavorable rock and soil structural planes of the excavation slope were analyzed with the stereographic projection method.The stability of reserve mountain slopes and backfill slopes were evaluated by circular arc sliding method.The results show that the stability of the engineering site is good,and the dip angle of the combined intersec-tion of structural planes of the excavated slope is larger than that of the slope,so the whole slope is stable.The stability safety fac-tor of reserve mountain slope meets the allowable value of the code.After the backfill slope is treated with anti-slide piles,the safety factor of slope stability is 1.436,which meets the requirements of the code.The maximum settlement of the foundation during the construction period is about 250 mm.The research results have reference significance for the study of site selection and stability of similar precision factory projects.
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