發(fā)布時(shí)間：2018-08-12 08:30

【摘要】：為研究水泥礫質(zhì)土滲透特性,改進(jìn)了常規(guī)三軸試驗(yàn)裝置,并在該裝置上進(jìn)行了水泥礫質(zhì)土三軸滲透試驗(yàn),分析了水泥摻入比、摻礫量、壓實(shí)度和滲透壓對(duì)水泥礫質(zhì)土滲透特性的影響。研究結(jié)果表明:水泥礫質(zhì)土的抗?jié)B性能隨水泥摻入比的增加而得到較大幅度的提高;當(dāng)摻礫量在30%~50%范圍時(shí),水泥礫質(zhì)土的滲透系數(shù)在10~(-7) cm/s數(shù)量級(jí),且滿足土石壩心墻抗?jié)B要求;相同摻礫量下,水泥礫質(zhì)土滲透系數(shù)隨著壓實(shí)度的增加而降低,尤其是壓實(shí)度≥98%時(shí),其抗?jié)B性能得到大幅度提高;在相同應(yīng)力狀態(tài)下,水泥礫質(zhì)土滲透系數(shù)k_(20)與滲透壓力比P(滲透壓力p/大氣壓力pa)符合雙曲線模型,且該雙曲線可轉(zhuǎn)換成P/k_(20)與滲透壓力比P之間的線性關(guān)系。該研究成果為水泥礫質(zhì)土應(yīng)用于高土石壩心墻提供科學(xué)支撐。
[Abstract]:In order to study the permeability characteristics of cement gravel soil, the conventional triaxial test device was improved, and the triaxial permeability test of cement gravel soil was carried out on the device. The influence of compaction degree and osmotic pressure on the permeability of cement gravel soil. The results show that the impermeability of cement-gravel soil increases greatly with the increase of cement content, and the permeability coefficient of cement-gravel soil is in the order of 10 ~ (-7) cm/s and meets the impermeability requirement of the core wall of earth-rock dam when the content of gravel is in the range of 30 ~ (-7)%. The permeability coefficient of cement-gravel soil decreases with the increase of compaction degree, especially when the compaction degree is 鈮，

本文編號(hào)：2178506