临近多隧道施工方案稳定性研究

以在富水碎石地层中同时修建净距极小的2条盾构法隧道和1条矿山法隧道的工程为背景,采用数值模拟方法,分析3种施工方案下隧道围岩稳定性及地面沉降。研究表明:先施工中间矿山法隧道;待施工完成后再施工左右两侧盾构法隧道,围岩塑性破坏面积最大,地面沉降值也最大,超过安全允许值;先施工矿山法隧道,待施工完成后施工左侧盾构法隧道,最后施工右侧盾构法隧道,围岩塑性破坏面积及地面沉降值较上一方案小;先同时施工两侧盾构法隧道,待施工完成后再施工中间矿山法隧道,围岩塑性破坏面积及地面沉降值最小,工程安全性最高。通过与现场实测对比,模拟数据与监测数据高度吻合。

SYNTHESIS OF NANOPOROUS SILICA WITH INTERIOR COMPOSITE CELLS WITH SYNTHETIC BLOCK COPOLYPEPTIDE AS TEMPLATE

Nanoporous silica with unusual interior composite cells was synthesized with synthetic block copolypeptide Phe20-b-PBLG50 as template for the first time. Anilino-methyl triethoxy silane (AMTS) was used as an intermedium to interact with block co-polypeptide Phe20-b-PBLG50 through π-π interaction between the phenyl groups of block copolypeptide and those of AMTS. Meanwhile, AMTS co-condenses together with tetraethoxylsilane (TEOS) after hy-drolysis. The structure of composite vesicles due to the self-assembly of block copolypeptide in the or-ganic solvent was immobilized and transcribed by the formation of silica. The formation of nanopores could be ascribed to the secondary structure of block co-polypeptide and small molecular amine. Our results provide a new avenue to synthesize porous oxide materials with novel interior structures templated by the copolypeptide self-assembly under ambient con-ditions.