土工膜下面地基施工验收要求及边坡处理
1.验(yan)收要求
场底(di)、边(bian)(bian)坡(po)(po)基(ji)(ji)(ji)础层(ceng)、锚固平(ping)(ping)台及(ji)(ji)回填材料要(yao)(yao)平(ping)(ping)整(zheng)、光滑、密实(shi)(shi)(shi)；无(wu)(wu)(wu)裂缝、无(wu)(wu)(wu)松土(tu)、无(wu)(wu)(wu)积(ji)水(shui)、无(wu)(wu)(wu)裸露(lu)泉眼，无(wu)(wu)(wu)明显凹凸不平(ping)(ping)，无(wu)(wu)(wu)尖(jian)锐(rui)变形或突起，无(wu)(wu)(wu)石头、砖(zhuan)块、瓦砾、无(wu)(wu)(wu)树根、杂(za)草、淤泥、腐(fu)殖土(tu)、无(wu)(wu)(wu)陶瓷、玻璃渣、钢筋渣及(ji)(ji)其(qi)他任(ren)何尖(jian)锐(rui)杂(za)物。基(ji)(ji)(ji)础层(ceng)2.5cm内粘(zhan)土(tu)层(ceng)不应(ying)含有粒径大于(yu)5mm的(de)尖(jian)锐(rui)物料。场底(di)、边(bian)(bian)坡(po)(po)基(ji)(ji)(ji)础层(ceng)、锚固平(ping)(ping)台间(jian)过(guo)渡平(ping)(ping)缓。场底(di)、边(bian)(bian)坡(po)(po)的(de)纵、横坡(po)(po)度(du)(du)符合(he)设计要(yao)(yao)求。场底(di)基(ji)(ji)(ji)础层(ceng)压(ya)实(shi)(shi)(shi)度(du)(du)不小于(yu)93%。四(si)周边(bian)(bian)坡(po)(po)基(ji)(ji)(ji)础层(ceng)结构(gou)稳(wen)定(ding)，压(ya)实(shi)(shi)(shi)度(du)(du)不小于(yu)90%。对于(yu)库区，要(yao)(yao)进(jin)行人(ren)工(gong)(gong)(gong)(gong)修(xiu)(xiu)整(zheng)、清淤和整(zheng)平(ping)(ping)工(gong)(gong)(gong)(gong)作。最后(hou)(hou)进(jin)行机械压(ya)实(shi)(shi)(shi)，采(cai)用(yong)推土(tu)机、振(zhen)动压(ya)路机进(jin)行地(di)(di)基(ji)(ji)(ji)压(ya)实(shi)(shi)(shi)，要(yao)(yao)采(cai)用(yong)振(zhen)动压(ya)路机进(jin)行碾(nian)压(ya)施(shi)工(gong)(gong)(gong)(gong)，碾(nian)压(ya)时，振(zhen)动压(ya)路机从低到(dao)(dao)高，从边(bian)(bian)到(dao)(dao)中，适当重(zhong)叠碾(nian)压(ya)，压(ya)路机碾(nian)压(ya)不到(dao)(dao)的(de)地(di)(di)方(fang)采(cai)用(yong)蛙式打夯(hang)机或人(ren)工(gong)(gong)(gong)(gong)夯(hang)实(shi)(shi)(shi)。碾(nian)压(ya)时先轻(qing)后(hou)(hou)重(zhong)，速度(du)(du)适中。先用(yong)压(ya)路机预压(ya)一遍，以提高压(ya)实(shi)(shi)(shi)层(ceng)上(shang)部的(de)压(ya)实(shi)(shi)(shi)度(du)(du)，然(ran)后(hou)(hou)用(yong)推土(tu)机修(xiu)(xiu)平(ping)(ping)后(hou)(hou)再碾(nian)压(ya)，以防(fang)止高低不平(ping)(ping)影响碾(nian)压(ya)效果。碾(nian)压(ya)到(dao)(dao)规定(ding)遍数(shu)后(hou)(hou)，工(gong)(gong)(gong)(gong)地(di)(di)试验人(ren)员及(ji)(ji)时检查(cha)土(tu)的(de)压(ya)实(shi)(shi)(shi)度(du)(du)，若(ruo)尚(shang)未达(da)到(dao)(dao)压(ya)实(shi)(shi)(shi)度(du)(du)要(yao)(yao)求，需要(yao)(yao)继续碾(nian)压(ya)，直至达(da)到(dao)(dao)规定(ding)的(de)压(ya)实(shi)(shi)(shi)度(du)(du)并经监(jian)理工(gong)(gong)(gong)(gong)程师(shi)认可(ke)才能下一步施(shi)工(gong)(gong)(gong)(gong)。
2.边坡处理
如果发(fa)现库区平整后的(de)边(bian)坡(po)(po)存(cun)在(zai)有(you)大量粒径不(bu)等的(de)石(shi)块(kuai)裸露(lu)在(zai)边(bian)坡(po)(po)表(biao)(biao)面(mian)(mian)(mian)，若(ruo)直接在(zai)边(bian)坡(po)(po)表(biao)(biao)面(mian)(mian)(mian)上铺膜(mo)，会对(dui)(dui)HDPE土工膜(mo)造(zao)成损坏，所以要(yao)(yao)对(dui)(dui)边(bian)坡(po)(po)基层(ceng)(ceng)表(biao)(biao)面(mian)(mian)(mian)采取(qu)相应的(de)处理方法；坡(po)(po)面(mian)(mian)(mian)表(biao)(biao)层(ceng)(ceng)若(ruo)为(wei)不(bu)满(man)足(zu)承载力(li)要(yao)(yao)求的(de)基层(ceng)(ceng)，则会影响(xiang)边(bian)坡(po)(po)稳定(ding)性，而(er)且会对(dui)(dui)膜(mo)造(zao)成损伤，此情况需对(dui)(dui)基层(ceng)(ceng)进行清理，拣除坡(po)(po)面(mian)(mian)(mian)较大的(de)石(shi)块(kuai)，然(ran)后对(dui)(dui)边(bian)坡(po)(po)场地表(biao)(biao)面(mian)(mian)(mian)进行补平，最后对(dui)(dui)坡(po)(po)面(mian)(mian)(mian)进行洒(sa)水，若(ruo)有(you)必要(yao)(yao)，采取(qu)砂浆(jiang)抹面(mian)(mian)(mian)层(ceng)(ceng)，保证(zheng)其与基层(ceng)(ceng)表(biao)(biao)面(mian)(mian)(mian)结合牢(lao)固、不(bu)开裂、不(bu)空鼓(gu)和密(mi)实(shi)不(bu)透水。
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