PENGARUH JARAK DAN PANJANG DEEP SOIL MIXING BERPOLA TRIANGULAR TERHADAP DAYA DUKUNG TANAH EKSPANSIF (The Effect Spacing and Length of Deep Soil Mixing by Using Triangular Configuration on The Bearing Capacity of Expansive Soil) (Jurusan Teknik Sipil, Fakultas Teknik, Universitas Brawijaya, 2016)