位于上游护坡板下,土工膜采用高密度聚乙烯土工膜,膜厚0.5mm

（1）上坝

上(shang)(shang)(shang)坝(ba)(ba)(ba)为(wei)(wei)两(liang)侧挡水,外库为(wei)(wei)上(shang)(shang)(shang)游(you)(you)(you),内库为(wei)(wei)下(xia)(xia)(xia)游(you)(you)(you),坝(ba)(ba)(ba)体(ti)从上(shang)(shang)(shang)游(you)(you)(you)到下(xia)(xia)(xia)游(you)(you)(you)依次为(wei)(wei)：现浇(jiao)混(hun)凝土(tu)护(hu)坡板(ban)、滤(lv)(lv)水无纺布(bu)(bu)、坝(ba)(ba)(ba)壳、心(xin)墙(qiang)(qiang)砂保(bao)护(hu)区(qu)(qu)、心(xin)墙(qiang)(qiang)土(tu)工(gong)膜(mo)、下(xia)(xia)(xia)游(you)(you)(you)护(hu)坡板(ban)下(xia)(xia)(xia)滤(lv)(lv)水无纺布(bu)(bu)、现浇(jiao)混(hun)凝土(tu)护(hu)坡板(ban)、下(xia)(xia)(xia)游(you)(you)(you)排水棱体(ti)。其中(zhong)上(shang)(shang)(shang)下(xia)(xia)(xia)游(you)(you)(you)均(jun)(jun)采用C25混(hun)凝土(tu)护(hu)坡板(ban),上(shang)(shang)(shang)游(you)(you)(you)板(ban)厚20cm,下(xia)(xia)(xia)游(you)(you)(you)板(ban)厚15cm,砼板(ban)尺(chi)寸为(wei)(wei)4.0m×4.0m。坡面设置间距2m×2m的PVC管排水孔,孔径150mm,混(hun)凝土(tu)强度等级(ji)C25F200W6。上(shang)(shang)(shang)下(xia)(xia)(xia)游(you)(you)(you)护(hu)坡板(ban)下(xia)(xia)(xia)均(jun)(jun)铺设一层滤(lv)(lv)水无纺布(bu)(bu),无纺布(bu)(bu)采用涤纶长丝(si)非制(zhi)(zhi)造布(bu)(bu),规(gui)格为(wei)(wei)200g/m2。上(shang)(shang)(shang)坝(ba)(ba)(ba)坝(ba)(ba)(ba)壳料取料及填筑(zhu)要求(qiu)(qiu)同下(xia)(xia)(xia)坝(ba)(ba)(ba)。心(xin)墙(qiang)(qiang)砂保(bao)护(hu)区(qu)(qu)厚1m,位于坝(ba)(ba)(ba)体(ti)中(zhong)央,该区(qu)(qu)砂要求(qiu)(qiu)同下(xia)(xia)(xia)坝(ba)(ba)(ba)土(tu)工(gong)膜(mo)下(xia)(xia)(xia)砂保(bao)护(hu)层。心(xin)墙(qiang)(qiang)土(tu)工(gong)膜(mo)规(gui)格要求(qiu)(qiu)同下(xia)(xia)(xia)坝(ba)(ba)(ba)斜墙(qiang)(qiang)土(tu)工(gong)膜(mo)。下(xia)(xia)(xia)游(you)(you)(you)排水棱体(ti)中(zhong)反(fan)滤(lv)(lv)料厚度0.3m,排水料厚2m。其中(zhong)反(fan)滤(lv)(lv)料要求(qiu)(qiu)同下(xia)(xia)(xia)坝(ba)(ba)(ba),排水料采用砂砾料配制(zhi)(zhi),粒径要求(qiu)(qiu)Dmax≤150mm,Dmin≥5mm,填筑(zhu)指(zhi)标Dr≥0.75。

（2）下坝

坝体从上(shang)游到(dao)下游依次为(wei)：现浇混凝土护坡(po)(po)板、砂浆垫层、两布一膜(mo)、砂保护层、坝壳、下游护坡(po)(po)、下游坡(po)(po)脚排水沟。

1）上游现浇混凝土护坡(po)板

位(wei)于上游坝坡(po)面,为现浇混凝(ning)土(tu)板(ban),厚(hou)度20cm,砼板(ban)尺寸为4.0m×4.0m。坡(po)面设置间(jian)距2m×2m的PVC管排水(shui)孔,孔径150mm,混凝(ning)土(tu)强度等级C25F200W6。

2）砂浆垫层

膜上(shang)铺设5cm厚的砂浆(jiang)垫层(ceng),砂浆(jiang)强度(du)等级为M10,铺设范围同土(tu)工膜。

3）两布一膜

位于上游(you)护坡板下,土(tu)工(gong)(gong)(gong)膜采(cai)用高(gao)密度(du)聚乙烯土(tu)工(gong)(gong)(gong)膜,膜厚0.5mm,土(tu)工(gong)(gong)(gong)布采(cai)用长纤针刺(ci)非织造(zao)土(tu)工(gong)(gong)(gong)布,布重200g/m2+200g/m2。考虑坝坡水位起(qi)降等不利(li)因素,土(tu)工(gong)(gong)(gong)膜膜厚取值(zhi)为0.5mm。

4）砂保护层

膜下铺设10cm厚(hou)的(de)砂保护(hu)层(ceng),粒(li)径要求小于5mm,填筑指标Dr≥0.75,铺设范围同土工膜。

5）坝壳

位于(yu)坝体砂保护层(ceng)下游,采用C1、C2料场砂砾(li)料填筑(zhu)(zhu)而成,填筑(zhu)(zhu)指标(biao)Dr≥0.85。其填筑(zhu)(zhu)顶(ding)高程为(wei)823.000m,砂砾(li)料填筑(zhu)(zhu)区上(shang)游边坡(po)为(wei)1∶2.25,填筑(zhu)(zhu)区下游边坡(po)为(wei)1∶2.0。

6）下游护坡

下(xia)游护坡采用0.5m×0.5m预制网格梁护坡。

7）下游坡脚排水沟

坡底布置(zhi)干(gan)砌(qi)石(shi)(shi)排(pai)水(shui)沟,排(pai)水(shui)沟底宽0.5m,坡比(bi)1∶2,深0.75m,由内至外(wai)分别为(wei)20cm砂砾石(shi)(shi)反滤料(liao),30cm厚干(gan)砌(qi)石(shi)(shi)。其中反滤料(liao)级(ji)配要求为(wei)D≤20mm,小于0.075mm含量≤5%,填筑指标Dr≥0.75。